All Wiring Diagrams for Toyota Highlander Limited 2003

AIR CONDITIONING

2.4L

2.4L, Manual A/C Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003

List of elements for 2.4L, Manual A/C Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003:

(in dash harness, at center of dash)
(in dash harness, at center of dash) i5
(in dash harness, at right side of dash)
A/c control assembly (behind center of dash)
A10
A11
A13
Acc
Aif
Air
Air inlet control servo motor (behind upper center of dash)
Air mix control servo motor (behind center of dash)
Air vent mode control servo motor (behind left center of dash)
Amc
Amh
Aod
Aof
Blower control switch
Blower motor (behind right side of dash)
Blower resistor (behind right side of dash)
Center j/b (behind upper center of dash)
Clk
Control panel
Dpd
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Evaporator temperature sensor (behind right side of dash)
F13
Fusible link block (on left side of engine compartment)
G10
Gnd
Haz
Heater fuse 15a
Heater fuse 50a
Heater relay (right of instrument panel j/b)
Hot at all times
Hot in on or acc
Hot in on or start
I10
I11
Ia (at left kick panel)
Ib (at right dash brace)
Ic (at right kick panel)
Ill+
Ill-
Instrument panel j/b (behind left side of dash)
Interior lights system
J10
Junction connector 5 (left side of dash, behind instrument cluster)
K13
Mpx+
Mpx-
Mr/f
Passenger side j/b (behind right side of dash)
Pnk
Radio 2 fuse 7.5a
Red
S5-1
Sg-1
Stx
Swd
Test
Tpo

2.4L, Manual A/C Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003

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List of elements for 2.4L, Manual A/C Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003:

(in engine compt harness, at left front of engine compt)
(on left rear of engine) engine coolant temperature sensor
(under left headlight) eg
A/c magnetic clutch & lock sensor (on a/c comp- ressor)
A/c triple pressure switch (on right front of engine compartment)
Acmg
B10
Body ecu (behind right side of dash)
C11
C12
Cds fuse 30a
Combination meter
Condenser fan motor (behind radiator)
Dual
Eb (at right front fender apron)
Ee (at intake side of cylinder block)
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compartment)
Engine room r/b (on left side of engine compartment)
Fan
Fan 1 relay
Fan 2 relay
Fan 3 relay
Fusible link block (on left side of engine compartment)
Hot at all times
Junction connector 4 (on right side of engine compartment)
Junction connector 7 (behind right side of dash)
Lck1
Mg clt relay
Mpx+
Mpx-
Mpx1
Mpx2
Passenger side j/b (behind right side of dash)
Power window master switch with ecu
Pr2
Pre
Radiator fan motor (behind radiator)
Rdi fuse 30a
Single
Thw

3.0L

3.0L, Automatic A/C Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Automatic A/C Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003:

(in dash harness, at center of dash)
(in dash harness, at right side of dash) i9
A/c ambient temperature sensor (on front center of grille)
A/c control assembly (behind center of dash)
A/c solar sensor (on upper left side of dash)
A10
A11
A13
Acc
Aif
Air
Air inlet control servo motor (behind upper center of dash)
Air mix control servo motor (behind center of dash)
Air vent mode control servo motor (behind left center of dash)
Amc
Amh
Aod
Aof
Blower motor (behind right side of dash)
Blower motor controller
Blw
Center j/b (behind upper center of dash)
Clk
Control panel
Dpd
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Evaporator temperature sensor (behind right side of dash)
F13
Fusible link block (on left side of engine compartment)
G10
Gnd
Haz
Heater fuse 15a
Heater fuse 50a
Heater relay (right of instrument panel j/b)
Hot at all times
Hot in on or acc
Hot in on or start
I11
Ia (at left kick panel)
Ib (at right dash brace)
Ic (at right kick panel)
Ig+
Ill+
Ill-
Instrument panel j/b (behind left side of dash)
Interior lights system
Junction connector 5 (left side of dash, behind instrument cluster)
K13
Mpx+
Mpx-
Mr/f
Passenger side j/b (behind right side of dash)
Pnk
Radio 2 fuse 7.5a
Red
Room temperature sensor (behind center of dash)
S5-1
S5-3
Sg-1
Sg-3
Sg-5
Stx
Swd
Tam
Tpo

3.0L, Automatic A/C Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Automatic A/C Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003:

(in engine compt harness, at left front of engine compt)
A/c magnetic clutch & lock sensor (on a/c comp- ressor)
A/c triple pressure switch (on right front of engine compt)
Acmg
B10
Body ecu (behind right side of dash)
C11
C12
Cds fuse 30a
Combination meter
Condenser fan motor (behind radiator)
Cooling fan diode (behind left side of dash)
Dual
E2 (in engine compt harness, at left front of engine compt)
E5 (in engine compt harness, at left side of engine compt)
Eb (at right front fender apron)
Ed (at rear side of surge tank)
Eg (under left headlight)
Eh (under left headlight)
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compartment)
Engine room r/b (on left side of engine compartment)
Fan 1 relay
Fan 2 relay
Fan 3 relay
Fusible link block (on left side of engine compartment)
Hot at all times
Junction connector 2 (behind left headlight)
Junction connector 4 (on right side of engine compartment)
Junction connector 7 (behind right side of dash)
Lck1
Mg clt relay
Mpx+
Mpx-
Mpx1
Mpx2
Passenger side j/b (behind right side of dash)
Power window master switch with ecu
Pre
Radiator fan motor (behind radiator)
Rdi fuse 30a
Single
Water temperature switch 1 (at right front of engine compartment, behind grille)
Water temperature switch 2 (on rear center of engine)

3.0L, Manual A/C Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Manual A/C Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003:

(in dash harness, at center of dash)
(in dash harness, at center of dash) i5
(in dash harness, at right side of dash)
A/c control assembly (behind center of dash)
A10
A11
A13
Acc
Aif
Air
Air inlet control servo motor (behind upper center of dash)
Air mix control servo motor (behind center of dash)
Air vent mode control servo motor (behind left center of dash)
Amc
Amh
Aod
Aof
Blower control switch
Blower motor (behind right side of dash)
Blower resistor (behind right side of dash)
Center j/b (behind upper center of dash)
Clk
Control panel
Dpd
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Evaporator temperature sensor (behind right side of dash)
F13
Fusible link block (on left side of engine compartment)
G10
Gnd
Haz
Heater fuse 15a
Heater fuse 50a
Heater relay (right of instrument panel j/b)
Hot at all times
Hot in on or acc
Hot in on or start
I10
I11
Ia (at left kick panel)
Ib (at right dash brace)
Ic (at right kick panel)
Ill+
Ill-
Instrument panel j/b (behind left side of dash)
Interior lights system
J10
Junction connector 5 (left side of dash, behind instrument cluster)
K13
Mpx+
Mpx-
Mr/f
Passenger side j/b (behind right side of dash)
Pnk
Radio 2 fuse 7.5a
Red
S5-1
Sg-1
Stx
Swd
Test
Tpo

3.0L, Manual A/C Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Manual A/C Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003:

(in engine compt harness, at left front of engine compt)
A/c magnetic clutch & lock sensor (on a/c comp- ressor)
A/c triple pressure switch (on right front of engine compartment)
Acmg
B10
Body ecu (behind right side of dash)
C11
C12
Cds fuse 30a
Combination meter
Condenser fan motor (behind radiator)
Cooling fan diode (behind left side of dash)
Dual
E5 (in engine compt harness, at left side of engine compt)
Ed (at rear side of surge tank)
Eg (under left headlight)
Eh (under left headlight)
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compartment)
Engine room r/b (on left side of engine compartment)
Fan 1 relay
Fan 2 relay
Fan 3 relay
Fusible link block (on left side of engine compartment)
Hot at all times
Junction connector 2 (behind left headlight)
Junction connector 4 (on right side of engine compartment)
Junction connector 7 (behind right side of dash)
Lck1
Mg clt relay
Mpx+
Mpx-
Mpx1
Mpx2
Passenger side j/b (behind right side of dash)
Power window master switch with ecu
Pre
Radiator fan motor (behind radiator)
Rdi fuse 30a
Single
Water temperature switch 1 (at right front of engine compartment, behind grille)
Water temperature switch 2 (on rear center of engine)

ANTI-LOCK BRAKES

Anti-lock Brakes Wiring Diagram, with VSC (1 of 3) for Toyota Highlander Limited 2003

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List of elements for Anti-lock Brakes Wiring Diagram, with VSC (1 of 3) for Toyota Highlander Limited 2003:

(2wd) slip ind
+bi
+bo
A12
Abs 1 fuse 40a
Abs 2 fuse 40a
Abs r/b (on left rear of engine compt)
Abs sol relay
Brake ind
Brake warning switch (on master cylinder assembly)
Brl
C11
C12
Combination meter
Data link connector (dcl) 3 (under left side of dash)
Eb (at right front fender apron)
Eng+
Engine room r/b (on left side of engine compt)
Fl+
Fl-
Fr+
Fr-
Fusible link block (on left side of engine compt)
Gnd1
Gnd2
Hot at all times
Hot in on or start
Ig1
Ign fuse 7.5a
Ind
Ind abs
Ind vsc
Instrument panel j/b (behind left side of dash)
J/c 6 (left side of dash, behind instrument cluster)
Junction connector 4 (on right side of engine compartment)
Lbl
Left front abs speed sensor (at left front wheel)
Left rear abs speed sensor (at left rear wheel)
Mr2
Parking brake switch (at base of parking brake pedal)
Passenger side j/b (behind right side of dash)
Passenger side j/b (behind right side of dash)
Pkb
Pnk
R1+
R2+
Right front abs speed sensor (at right front wheel)
Right rear abs speed sensor (at right rear wheel)
Rl+
Rl-
Rr+
Rr-
S11
S12
Sflh
Sflr
Sil
Skid control ecu (above instrument panel j/b)
Skid control relay
Sp1
Src1
Src2
Srm1
Srm2
Srrh
Srrr
Stp
Trac off ind
Trc+
Trc-
Vscw

Anti-lock Brakes Wiring Diagram, with VSC (2 of 3) for Toyota Highlander Limited 2003

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List of elements for Anti-lock Brakes Wiring Diagram, with VSC (2 of 3) for Toyota Highlander Limited 2003:

(behind right side of dash) engine control module
2.4l
3.0l
A11
Abs 3 fuse 7.5a
Brake actuator (on left rear of engine compartment)
E5 e6
Ecu-b fuse 7.5a
Eg (under left headlight)
Eh (under left headlight)
Eng+
Engine room j/b (on left side of engine compartment)
Engine room r/b (on left side of engine compartment)
Hot at all times
Instrument panel j/b (behind left side of dash)
Master cylinder pressure sensor
Nca
Neo
Passenger side j/b (behind right side of dash)
Pnk
Red
Stop fuse 20a
Stoplight switch (above brake pedal)
Trc+
Trc-

Anti-lock Brakes Wiring Diagram, with VSC (3 of 3) for Toyota Highlander Limited 2003

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List of elements for Anti-lock Brakes Wiring Diagram, with VSC (3 of 3) for Toyota Highlander Limited 2003:

2.4l
3.0l
A/t indicator switch (on left side of transmission)
Ast
Bat
Brake pedal load sensing switch (above brake pedal)
C11
Ccs
Center j/b (behind upper center of dash)
Cruise control system
Csw
D/g
D10
Deceleration sensor (at base of shifter lever)
Ecu-ig fuse 15a
Ess
Fss
Fsw+
Fsw-
Ggnd
Gl1
Gl2
Gnd3
Gnd4
Gss
Gyaw
Hot in on or start
Ib (at right dash brace)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 8 (behind right side of dash)
Junction connector 2 (behind left headlight)
Junction connector 6 (left side of dash behind instrument cluster)
Nca
Neo
Passenger side j/b (behind right side of dash)
Pmc
Pnk
Red
S10
Sfrh
Sfrr
Skid control ecu (above instrument panel j/b)
Sm1+
Sm1-
Sm2+
Sm2-
Srlh
Srlr
Ss1+
Ss1-
Steering sensor (in steering column)
Trac off switch (2wd)
Trig
Vcm
Vgs
Vsc warning buzzer (above of instrument panel j/b)
Vys
Yaw rate sensor (on rear of vehicle)
Yaw2
Yss

Anti-lock Brakes Wiring Diagram, without VSC (1 of 2) for Toyota Highlander Limited 2003

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List of elements for Anti-lock Brakes Wiring Diagram, without VSC (1 of 2) for Toyota Highlander Limited 2003:

(above brake pedal)
2.4l
3.0l
A12
Abs 1 fuse 40a
Abs 2 fuse 40a
Abs mtr relay
Abs sol relay
Ast
Brake pedal load sensing switch
Brl
D/g
D10
Data link connector (dcl) 3 (under left side of dash)
Ecu-ig fuse 15a
Eh (under left headlight)
Engine control module (behind right side of dash)
Engine room r/b (on left side of engine compt)
Fsw+
Fsw-
Fusible link block (on left side of engine compt)
Gnd3
Gnd4
Hot at all times
Hot in on or start
Ig1
Instrument panel j/b (behind left side of dash)
J/c 2 (behind left headlight)
J/c 6 (left side of dash, behind instrument cluster)
Lbl
Left front abs speed sensor (at left front wheel)
Left rear abs speed sensor (at left rear wheel)
Mrf
Neo
Parking brake switch (at base of parking brake pedal)
Passenger side j/b (behind right side of dash)
Pkb
Pnk
Right front abs speed sensor (at right front wheel)
Right rear abs speed sensor (at right rear wheel)
Rl+
Rl-
Rr+
Rr-
Sflh
Sflr
Sil
Skid control ecu (above instrument panel j/b)
Sm1+
Sm1-
Sm2+
Sm2-
Sp1
Srrh
Srrr
Stp
Transmissions system

Anti-lock Brakes Wiring Diagram, without VSC (2 of 2) for Toyota Highlander Limited 2003

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List of elements for Anti-lock Brakes Wiring Diagram, without VSC (2 of 2) for Toyota Highlander Limited 2003:

(4wd) deceleration sensor
(at base of shifter lever)
(at right front fender apron)
4wd
A11
Abs 3 fuse 7.5a
Abs ind
Brake
Brake actuator (on left rear of engine compartment)
Brake warning switch (on master cylinder assembly)
C11
C12
Combination meter
Eg (under left headlight)
Eh (under left headlight)
Engine room r/b (on left side of engine compartment)
Fl+
Fl-
Fr+
Fr-
Fss
Ggnd
Gl1
Gnd1
Gnd2
Gss
Hot at all times
Hot in on or start
Ign fuse 7.5a
Ind
Instrument panel j/b (behind left side of dash)
Junction connector 4 (on right side of engine compartment)
Master cylinder pressure sensor
Nca
Passenger side j/b (behind right side of dash)
Pmc
Pnk
Red
Sfrh
Sfrr
Skid control ecu (above instrument panel j/b)
Srlh
Srlr
Srm1
Srm2
Stop fuse 20a
Stoplight switch (above brake pedal)
Vcm
Vgs

ANTI-THEFT

Forced Entry Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Forced Entry Wiring Diagram for Toyota Highlander Limited 2003:

(in dash harness, at top right side of dash) i4
+b1
2.4l engine
3.0l engine
B12
Back door key lock & unlock switch
Be (at left side of back door)
Becu
Body ecu (behind right side of dash)
Center j/b
Center j/b (behind upper center of dash)
Computer data lines system
Cpub
Dswh
Ecu-b fuse 7.5a
Ecu-ig fuse 15a
Eg (under left headlight)
Engine control module (behind right side of dash)
Engine hood courtesy switch (on front center of engine compt)
Engine room j/b (on left side of engine compt)
F11
F13
G10
Gnd
Hot at all times
Hot in on or start
Ib (at right dash brace)
Ic (at right kick panel)
Imld
Ind
Instrument panel j/b (behind left side of dash)
Iout
J/c 1 (behind left headlight)
J/c 14 (on left rear of vehicle)
J/c 6 (left side of dash, behind instrument cluster)
J11
K11
Ksw
Mpx1
Option connector 2 (behind upper right side of dash)
Passenger side j/b (behind right side of dash)
Power window master switch w/ ecu
Security fuse 15a
Sh-
Theft deterrent ecu (behind right side of dash)
Theft deterrent horn (on right side of engine compt)
Theft deterrent indicator light
Ul2
Unlock warning switch
W/ engine immobilizer circuit

Immobilizer Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Immobilizer Wiring Diagram for Toyota Highlander Limited 2003:

(2.4l)
(3.0l)
Batt
Code
Efi fuse 20a
Efi relay
Eh (under left headlight)
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compt)
Forced entry circuit
Gnd
Hot at all times
I7 (at dash harness, at right side of dash)
Ic (at right kick panel)
Illum
Imld
Interior lights system
J/c 2 (behind left headlight)
Ksw
Mrel
Passenger side j/b (behind right side of dash)
Pnk
Rxck
Transponder key amplifier (in steering column)
Txct

BODY CONTROL MODULES

Body Control Modules Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003

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List of elements for Body Control Modules Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003:

A10
Acc
Act+
Act-
Actd
Anti-theft & door locks systems
B10
B11
B12
Bcty
Bdr1
Becu
Body ecu (behind right side of dash)
Bzr
Center j/b (behind upper center of dash)
Cltb
Clte
Clts
D fr door fuse 20a
D12
Dbkl
Dcty
Dcyl
Door lock fuse 25a
Door locks system
Drl
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Exterior lights system
Exterior lights, headlights, interior lights & anti-theft systems
F13
Ffgo
Ffog
G10
Gnd1
Gnd2
H11
Haz
Head
Headlights & anti-theft systems
Headlights system
Horn
Horns system
Hot at all times
Hot in acc or on
Hot in on or start
Hrly
Ib (at right dash brace)
Ic (at right kick panel)
Ig1 fuse 7.5a
Ile
Instrument panel j/b (behind left side of dash)
Interior & exterior lights systems
Interior lights & door locks systems
Interior lights system
Interior lights, door locks & anti-theft systems
J/c 6 (left side of dash, behind instrument cluster)
K10
Ksw
Left front door courtesy light
Lswa
Lswp
Mpx1
Mpx2
Obd2
P fr door fuse 25a
Parking brake switch (at base of parking brake pedal)
Passenger side j/b (behind right side of dash)
Pbkl
Pcty
Pcyl
Pkb
Pkl
Pkul
Pml
Pmul
Pnk
Power windows system
Prg
Radio 2 fuse 7.5a
Rcty
Rda
Red
Right front door courtesy light
Rld
Rlu
Rrd
Rru
Snow
Tail
Transmissions system
Trly
Unlock warning switch (in steering column)

Body Control Modules Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003

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List of elements for Body Control Modules Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003:

2.4l
3.0l
A/c control assembly (behind center of dash)
A10
A11
A12
C11
C12
Combination meter
Data link connector (dlc) 3 (under left side of dash)
E12
Engine control module (behind right side of dash)
I3 (in dash harness, at top left side of dash)
Instrument panel j/b (behind left side of dash)
Mpx+
Mpx-
Mpx1
Mpx2
Option connector 1 (behind left kick panel)
Passenger side j/b (behind right side of dash)
Power window master switch (w/ ecu)
Sil
Sliding roof control ecu (on front of sliding roof)
Theft deterrent ecu (behind right side of dash)
W/ anti-theft system
W/o anti-theft system

COMPUTER DATA LINES

Computer Data Lines Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Computer Data Lines Wiring Diagram for Toyota Highlander Limited 2003:

(2.4l) ee (at intake side of cylinder block)
(behind center of dash) a/c control assembly
(on front of sliding roof) sliding roof control ecu
2.4l
3.0l
A10
A11
A12
A17
Air bag sensor assembly (below shifter console)
B10
Bat
Body ecu (behind right side of dash)
C/c
C11
C12
Combination meter
Cruise control ecu (behind left side of dash)
Cruise ind
D/g
Data link connector (dlc) 3 (under left side of dash)
E11
E12
Ed (3.0l) (at rear side of surge tank)
Engine control module (behind right side of dash)
Hot at all times
I3 (in dash harness, at top left side of dash)
I8 (3.0l)
Ic (at right kick panel)
Instrument panel j/b (behind left side of dash)
Junction conenctor 6 (left side of dash, behind instrument cluster)
Junction connector 7 (behind right side of dash)
Mpx+
Mpx-
Mpx1
Mpx2
Obd fuse 7.5a
Obd2
Option connector 1 (behind left kick panel)
Passenger side j/b (behind right side of dash)
Power window master switch with ecu
S10
S11
Sil
Skid control ecu (above instrument panel j/b)
Theft deterrent ecu (behind right side of dash)
W/ theft deterrent
W/ vsc
W/o theft deterrent
W/o vsc
Wfse

COOLING FAN

2.4L

2.4L, Cooling Fan Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for 2.4L, Cooling Fan Wiring Diagram for Toyota Highlander Limited 2003:

(at right front fender apron)
(in engine compt harness, at left front of engine compt)
(on left rear of engine) engine coolant temperature sensor
A/c triple pressure switch (right front of engine compt)
Cds fuse 30a
Condenser fan motor (behind radiator)
E9 (engine compt harn, at rear of engine)
Eg (under left headlight)
Engine control module (behind right side of dash)
Engine controls system
Engine room j/b (left side of engine compt)
Engine room r/b (on left side of engine compt)
Fan
Fan 1 relay
Fan 2 relay
Fan 3 relay
Fusible link block (left side of engine compt)
Heater fuse 15a
Hot at all times
Hot in run or start
Instrument panel j/b (behind left side of dash)
Junction connector 4 (on right side of engine compartment)
Junction connector 5 (left side of dash, behind instrument cluster)
Pr2
Radiator fan motor (behind radiator)
Rdi fuse 30a
Thw

3.0L

3.0L, Cooling Fan Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for 3.0L, Cooling Fan Wiring Diagram for Toyota Highlander Limited 2003:

(in engine compt harness, at left front of engine compt)
A/c triple pressure switch (on right front of engine compt)
Acmg
Cds fuse 30a
Condenser fan motor (behind radiator)
Cooling fan diode (behind left side of dash)
E7 (in engine compt harness, at rear of engine)
Eb (at right front fender apron)
Eg (under left headlight)
Eh (under left headlight)
Engine control module (behind right side of dash)
Engine controls sustem
Engine coolant temperature sensor (on front center of engine)
Engine room j/b (on left side of engine compt)
Engine room r/b (on left side of engine compt)
Fan 1 relay
Fan 2 relay
Fan 3 relay
Fusible link block (on left side of engine compt)
Heater fuse 15a
Hot at all times
Hot in on or start
Instrument panel j/b (behind left side of dash)
Junction connector 2 (behind left headlight)
Junction connector 4 (on right side of engine compartment)
Junction connector 5 (left side of dash, behind instrument cluster)
Mg clt relay
Radiator fan motor (behind radiator)
Rdi fuse 30a
Thw
Water temperature switch 1 (at right front of engine compartment, behind grille)
Water temperature switch 2 (on rear center of engine)

CRUISE CONTROL

Cruise Control Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Cruise Control Wiring Diagram for Toyota Highlander Limited 2003:

(w/ vsc)
(w/o vsc)
2.4l
3.0l
C/c
C11
C12
Cancel
Ccs
Center j/b (behind upper center of dash)
Combination meter
Cruise
Cruise control actuator (on right rear of engine compt)
Cruise control ecu (behind left side of dash)
Cruise control switch (spiral cable)
Cruise ind
Data link connector (dlc) 3 (under left side of dash)
Ecc
Ect
Ecu-ig fuse 15a
Engine control module (behind right side of dash)
G13
Gnd
H10
Hot at all times
Hot in on or start
Ic (at right kick panel)
Idl
Idlo
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
Junction connector 6 (left side of dash, behind instrument cluster)
Junction connector 8 (behind right side of dash)
Od1
Park/neutral position switch (on left side of transmission)
Passenger side j/b (behind right side of dash)
Res/ acc
S10
Set/ coast
Skid control ecu (above instrument panel j/b)
Spd
Stop fuse 20a
Stoplight switch (above brake pedal)
Stp

DEFOGGERS

Mirror Heater & Front Deicer Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Mirror Heater & Front Deicer Wiring Diagram for Toyota Highlander Limited 2003:

(in engine compt harness, at center of firewall) e3
A10
Center j/b (behind upper center of dash)
D14
Deicer relay
F13
Fr def fuse 20a
Front wiper deicer & mirror heater switch
Front wiper deicer (on left rear of engine compt)
Hot at all times
Hot in on or start
Ia (at left kick panel)
Ib (at right dash brace)
Ic (at right kick panel)
Ig1 fuse 7.5a
Ill
Instrument panel j/b (behind left side of dash)
Interior lights system
K10
L10
L12
Left mirror heater
Left remote control mirror
Passenger side j/b (behind right side of dash)
R/b 1 (left of instrument panel j/b)
Right mirror heater
Right remote control mirror

Rear Defogger Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Rear Defogger Wiring Diagram for Toyota Highlander Limited 2003:

A10
B5 (in body harness, at left rear of vehicle)
Be (at left side of back door)
Eh (under left headlight)
Engine room j/b (on left side of engine compt)
Fusible link block (on left side of engine compt)
Heater fuse 15a
Hot at all times
Hot in on or start
Instrument panel j/b (behind left side of dash)
J/c 14 (on left rear of vehicle)
J/c 2 (behind left headlight)
J/c 5 (left side of dash, behind instrument cluster)
Noise filter (rear window defogger) (on left rear of vehicle)
R16
R17
Rdfg
Rear defog relay
Rear window defogger
Rear window defogger switch (a/c control assembly)
Rr def fuse 30a

ENGINE PERFORMANCE

2.4L

2.4L, Engine Performance Wiring Diagram (1 of 3) for Toyota Highlander Limited 2003

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List of elements for 2.4L, Engine Performance Wiring Diagram (1 of 3) for Toyota Highlander Limited 2003:

#10
#20
#30
#40
(behind left kick panel)
(on side of trans) turbine speed sensor
(rear of engine)
(right end of dash)
(right kick panel)
(right side of cylinder block)
(right side of cylinder block) ee
(right side of dash)
(right side of dash) i6
A/c system
Anti-theft system
Camshaft timing control valve (right front of engine)
Code
Cooling fans system
Cooling fans system
Counter gear speed sensor (left side of engine compt)
Cruise control ecu (behind left side of dash)
E02
E03
E8 (top of engine)
E9 (rear of engine)
Ef (left side of cylinder block)
Electronically controlled transmission solenoid
Engine control module (behind right end of dash)
Engine coolant temperature sensor (left rear of engine)
Eo1
Fan
Fuel injectors
Hot in on or start
Idle air control valve (on throttle body)
Idlo
Ig2 fuse 15a
Igf
Ignition coils & igniters
Igt1
Igt2
Igt3
Igt4
Imld
Instrument panel j/b (behind left side of dash)
J/c
J/c 6 (behind left side of dash)
Knk1
Ksw
Nc+
Nc-
Noise filter
Nsw
Nt+
Nt-
O/d main switch (center console)
Ocv+
Ocv-
Od1
Odms
Passenger side j/b (behind right side of dash)
Pnk
Pr2
Pre
Ptnk
Rear of vehicle)
Red
Rsd
Rxck
Sl1+
Sl1-
Sl2+
Sl2-
Slt+
Slt-
Spd
Starting system
Switching valve) (left
Tach
Tbp
Tha
Tho
Throttle position sensor (side of throttle body)
Thw
Transponder key amplifier (w/ immobilizer) (in steering column)
Txct
Unlock warning switch (w/ immobilizer) (in steering column)
Vapor pressure sensor (rear of vehicle)
Vsv (pressure
Vta1

2.4L, Engine Performance Wiring Diagram (2 of 3) for Toyota Highlander Limited 2003

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List of elements for 2.4L, Engine Performance Wiring Diagram (2 of 3) for Toyota Highlander Limited 2003:

(rear of engine)
A/f fuse 25a
A/f relay
Airbag sensor assembly (below shifter console)
Bc (left side of rear crossmember)
C11
C12
Center j/b (behind center of dash)
Circuit opening relay
Combination meter
E10
Ecu-b fuse 7.5a
Efi fuse 20a
Efi relay
Engine room j/b (left side of engine compt)
Engine room r/b (left side of engine compt)
F13
Fuel pump
G10
Hot at all times
Hot in on or start
Ib (right dash brace)
Ig1 fuse 7.5a
Ign fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 2 (behind left head- lamp)
L11
M12
Malfunction indicator lamp
O/d off lamp
Oil pressure switch (left rear of engine)
Passenger side j/b (behind right side of dash)
Pnk
Power steering oil pressure switch (front of engine)
R/b 1 (behind left side of dash)
Speedo
Stop fuse 20a
Stoplight switch (above brake pedal)
Tach
Vsv (canister closed valve) (left rear of engine compt)

2.4L, Engine Performance Wiring Diagram (3 of 3) for Toyota Highlander Limited 2003

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List of elements for 2.4L, Engine Performance Wiring Diagram (3 of 3) for Toyota Highlander Limited 2003:

(center rear of engine) camshaft position sensor
(left front engine) crankshaft position sensor
(left rear of engine compt) (evap) vsv
(left rear of engine compt) mass air flow meter
(on exhaust manifold) (bank 1 sensor 1) air fuel ratio sensor
(on exhaust manifold) (bank 2 sensor 1) air fuel ratio sensor
(on exhaust) (bank 1 sensor 2) heated oxygen sensor
(on exhaust) (bank 2 sensor 2) heated oxygen sensor
(right
(right side of cylinder block)
(right side of cylinder block) ee
(right side of dash) i6
(right side of dash) j/c 7
A/c system
A/t indicator switch (left side of transmission)
A12
Acmg
Af1a+
Af1a-
Af2+
Af2-
Batt
Ccv
Charging system
Computer data lines system
Data link connector 3 (under left side of dash)
Dsl
E04
E05
E2g
E9 (rear of engine)
Eng+
Eng-
Engine control module (behind right end of dash)
Eom
Evp1
F/ps
G22+
Haf1a
Haf2a
Ht1b
Ht2b
Igsw
J/c 6 (left
Knock sensor
Lck1
Mops
Mpx1
Mpx2
Mrel
Nca a
Ne+
Ne-
Neo
Odlp
Ox1b
Ox2b
Passenger side j/b (behind
Pnk
Psw
Red
Right side of dash)
S10
S11
Side of dash)
Side of engine)
Sil
Skid control ecu (above instrument panel j/b)
Sta
Starting system
Stp
Trc+
Trc-
W/ stability ctrl
W/o stability ctrl
Wfse

3.0L

3.0L, Engine Performance Wiring Diagram (1 of 3) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (1 of 3) for Toyota Highlander Limited 2003:

#10
#20
#30
#40
#50
#60
(front of engine) e6
(rear of engine)
(rear side of surge tank) ed
(right side of dash)
(right side of dash) i6
(right side of surge tank) ec
Aci1
Acis
Afl+
Afl-
Afr+
Afr-
Air fuel ratio sensor (bank 1, sensor 1) (on right
Air fuel ratio sensor (bank 2, sensor 1) (on left
Camshaft timing control valve (right) (right rear of engine)
Crankshaft position sensor (left front of engine)
Dsl
E01
E02
E03
E04
E05
E2g
E6 (front of engine)
Ed (rear of surge tank)
Engine control module (behind right end of dash)
Engine coolant temperature sensor (front of engine)
Evp1
Exhaust manifold)
Fuel injectors
Hafl
Hafr
Hot in on or start
Ig2 fuse 15a
Igf
Ignition coils & igniters
Igt1
Igt2
Igt3
Igt4
Igt5
Igt6
Instrument panel j/b (behind left side of dash)
J/c 7 (right side of dash)
Knkl
Knkr
Knock sensor (left center of engine)
Knock sensor (right center of engine)
Mass air flow meter (left rear of engine compt)
Nc+
Nc-
Nca
Ne+
Ne-
Noise filter
Oc1+
Oc1-
Oc2+
Oc2-
Pnk
Power steering oil pressure switch (front of engine)
Red
Rso
Sl1+
Sl1-
Sl2+
Sl2-
Tha
Tho
Throttle position sensor (on side of throttle body)
Thw
Vapor pressure sensor (rear of vehicle)
Vta1
Vv1+
Vvt sensor (left) (left rear of engine)
Vvt sensor (right) (right rear of engine)
W2+

3.0L, Engine Performance Wiring Diagram (2 of 3) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (2 of 3) for Toyota Highlander Limited 2003:

(rear of surge tank) ed
(right dash brace)
A/f fuse 25a
A/f relay
Bc (left side of rear crossmember)
C11
C12
Camshaft timing control valve (left) (left rear of engine)
Center j/b (behind upper center of dash)
Circuit opening relay
Combination meter
Counter gear speed sensor (left side of engine compt)
E10
E7 (rear of engine)
Ecu-b fuse 7.5a
Electronically controlled transmission solenoid
Engine room j/b (left side of engine compt)
Engine room r/b (left side of engine compt)
F13
Fuel pump
G10
Hot at all times
Hot in on or start
Idle air control valve (on throttle body)
Ig1 fuse 7.5a
Ign fuse 7.5a
Instrument panel j/b (behind left side of dash)
L11
M12
Malfunction indicator lamp
Passenger side j/b (behind right side of dash)
Pnk
R/b 1 (behind left side of dash)
Red
Speedometer
Stop fuse 20a
Stoplight switch (above brake pedal)
Tachometer
Vsv (acis 1) (center top of engine)
Vsv (acis 2) (center rear of engine)
Vsv (canister closed valve) (left rear of engine compt)
Vsv (evap) (center top of engine)

3.0L, Engine Performance Wiring Diagram (3 of 3) for Toyota Highlander Limited 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (3 of 3) for Toyota Highlander Limited 2003:

(behind
(behind right side of dash) passenger side j/b
(in steering column) (w/immobilizer)
(left kick panel) j/c 9
(left side of engine compt)
(right end of dash)
(right side of dash)
A/c system
A/t indicator switch (left side of transmission)
A12
Acm1
Acmg
Airbag sensor assembly (below shifter console)
Anti-theft system (theft indicator light)
Batt
Ccv
Charging system
Code
Computer data lines system
Converter)
Cooling fans system
Cruise control ecu
Data link connector 3 (under left side of dash)
Ed (rear of surge tank)
Efi fuse 20a
Efi relay
Eng+
Eng-
Engine control module (behind right end of dash)
Engine room j/b (left side of engine compt)
Eom
F/ps
Hot at all times
Hts
Ic (right kick panel)
Idlo
Igsw
Imld
J/c 2 (behind left head- lamp)
J/c 6 (behind left side of dash)
J/c 8 (behind right side of dash)
Ksw
Lck1
Left side of dash)
Mops
Mpx1
Mpx2
Mrel
Nca
Neo
Nsw
Nt+
Nt-
O/d main switch (center console)
Od1
Odlp
Odms
Oil pressure switch (left front of engine)
Oxs
Passenger side j/b (behind right side of dash)
Pnk
Pre
Ptnk
Rxck
S10
S11
Sil
Skid control ecu (above instrument panel j/b)
Slt+
Slt-
Spd
Sta
Starting system
Stp
Tach
Tbp
Transponder key amplifier
Trc+
Trc-
Turbine speed sensor (on side of trans)
Txct
Unlock warning switch
Vsv (acm) (left front of engine compt)
Vsv (pressure switching valve) (left rear of vehicle)
W/ stability ctrl
W/o stability ctrl

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Back-up Lamps Wiring Diagram for Toyota Highlander Limited 2003:

Back-up light switch (on left side of transmission)
Bc (at left side of rear crossmember)
Hot in on or start
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
Junction connector 11 (on right rear of vehicle)
Junction connector 12 (on left rear of vehicle)
Junction connector 13 (on left rear of vehicle)
Junction connector 8 (behind right side of dash)
Left back-up light
Left rear combination light
Passenger side j/b (behind right side of dash)
Right back-up light
Right rear combination light

Exterior Lamps Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Exterior Lamps Wiring Diagram for Toyota Highlander Limited 2003:

(in body harness, at right rear of vehicle)
(on left rear of vehicle) junction connector 13
Alt fuse 140a
B10
B11
Bc (at left side of rear crossmember)
Body ecu (behind right side of dash)
C10
C11
C13
Center j/b (behind upper center of dash)
Combi- nation switch
Combination meter
E10
Engine room j/b (on left side of engine compt)
F13
Fusible link block (on left side of engine compt)
G10
Haz
Hazard fuse 15a
Hazard switch (a/c control assembly)
Head
High mounted stop light
Hot at all times
Hot in on or start
Ia (at left kick panel)
Ib (at right dash brace)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 3 (on right side of engine compt)
Junction connector (on left rear of vehicle)
Junction connector 1 (behind left headlight)
Junction connector 11 (on right rear of vehicle)
Junction connector 12 (on left rear of vehicle)
Junction connector 14 (on left rear of vehicle)
Junction connector 3 (on right side of engine compt)
Left
Left front park/ turn light
Left rear combin- ation light
Left rear side marker light
License plate light
Light control switch (part of combination switch)
M13
Off
Park
Passenger side j/b (behind right side of dash)
Right
Right front park/ turn light
Right rear combin- ation light
Right rear side marker light
Stop
Stop fuse 20a
Stoplight switch (above brake pedal)
Tail
Tail fuse 10a
Taillight relay
Trly
Turn
Turn signal flasher (right of instrument panel j/b)
Turn signal ind lights
Turn signal switch
W/ trailer tow
W/o trailer tow

Trailer Tow Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Trailer Tow Wiring Diagram for Toyota Highlander Limited 2003:

Bc (at left side of rear crossmember)
Body ecu (behind right side of dash)
C10
Center j/b (behind upper center of dash)
D14
Engine room j/b (on left side of engine compt)
G10
Gnd
Haz
Hazard fuse 15a
Hazard switch (a/c control assembly)
Hot at all times
Hot in on or start
Ia (at left kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
Junction connector 10 (on left rear of vehicle)
Junction connector 12 (on left rear of vehicle)
Junction connector 13 (on left rear of vehicle)
Lt/s
Passenger side j/b (behind right side of dash)
Red
Rt/s
Stop fuse 20a
Stoplight switch (above brake pedal)
Stp
Tail
Tail fuse 10a
Towing fuse 20a
Trailer converter
Trailer hitch
Turn signal flasher (right of instrument panel j/b)
Turn signal switch (part of comb- ination switch)

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 4) for Toyota Highlander Limited 2003

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List of elements for Ground Distribution Wiring Diagram (1 of 4) for Toyota Highlander Limited 2003:

(w/ drl)
(w/ vsc)
(w/o drl)
2.4l engine
A/c magnetic clutch & lock sensor
A/c triple pressure switch
A/f relay
Abs r/b
Brake actuator
Brake warning switch
Data link connector
Drl 3 relay
Drl 4 relay
E1 (engine harn, right front of engine compt)
E2 (engine harness, left front of engine compt)
E9 (engine harn, rear of engine)
Ee (on intake side of cylinder block)
Ef (left side of cylinder block)
Efi relay
Engine control module
Engine hood courtesy switch
Engine room j/b
Engine room r/b
Engine room r/b 3
Fan 2 relay
Heated oxygen sensor (bank 2, sensor 1)
Heated oxygen sensor (bank 2, sensor 2)
I6 (dash harn, right side of dash)
Idle air control valve
Ignition coil & igniter
J/c 1 (under left headlight)
J/c 2 (under left headlight)
J/c 3 (on right front corner of engine compt)
J/c 4 (front of right front fender)
J/c 7 (behind right side of dash)
Left front fog light
Left front parking light
Left front turn signal & parking light
Left headlight (low beam)
Park/ neutral position switch
Radiator fan motor
Rear defog relay
Right front fog light
Right front parking light
Right front turn signal & parking light
Right headlight (low beam)
S12
Skid control ecu
Skid control relay
W/ traction control
W/o traction control
Washer level switch
Water temperature switch

Ground Distribution Wiring Diagram (2 of 4) for Toyota Highlander Limited 2003

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List of elements for Ground Distribution Wiring Diagram (2 of 4) for Toyota Highlander Limited 2003:

(w/ seat heater)
(w/o seat heater)
3.0l engine
A/c magnetic clutch & lock sensor
A17
Acc relay
Air bag sensor assembly
B3 (body harn, center console)
Bb (right center pillar)
Blower control switch
Blower motor control
C13
Combination switch
D14
Data link connector
E6 (engine harn, front of engine)
Ec (right side of surge tank)
Ed (rear side of surge tank)
Engine control module
Front wiper deicer
Front wiper motor
Heated oxygen sensor (bank 1, sensor 2)
I6 (dash harn, right side of dash)
I8 (dash harn, right end of dash)
Ia (left kick panel)
Idle air control valve
Ignition coil & igniter
Instrument panel j/b (behind left side of dash)
J/c 11 (on right rear of vehicle)
J/c 7 (behind right side of dash)
L10
Park/ neutral position switch
Right buckle switch
Right rear combination light
Right rear door lock unit
Right rear power window switch
Right rear side marker light
Right seat heater
S23
Stereo power amplifier
To passenger side j/b (diagram 3 of 4)
Wireless door lock ecu

Ground Distribution Wiring Diagram (3 of 4) for Toyota Highlander Limited 2003

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List of elements for Ground Distribution Wiring Diagram (3 of 4) for Toyota Highlander Limited 2003:

(body harn, right rear of vehicle) b4
(right instrument panel brace)
(upper right kick panel)
(w/ manual a/c)
A/c control assembly
A10
B1 (body harn, left "a" pillar)
B12
B2 (body harn, left front door)
Blower resistor
Body ecu
C11
C13
C14
Center j/b (behind upper center of dash)
Cigarette lighter
Combination meter
Cruise control actuator
Cruise control ecu
Data link connector
Door lock control switch
E10
E11
Electronically controlled transmission pattern sensor
Engine control module
F11
F13
From instrument panel j/b (diagram 2 of 4)
Front power outlet
Front wiper deicer & mirror heater switch
Front/rear wiper & washer switch
Fuel pump sender (sub)
G10
Garage door opener & left vanity light
Glove box light
H10
H11
Heater relay
J10
J11
Key interlock solenoid
L10
Left remote control mirror
Left seat heater switch
O/d main switch
Option connector
Passenger side j/b (behind right side of dash)
Personal light
Power window master switch
R/b 1
Radio & player
Remote control mirror switch
Right front door lock unit
Right front power window switch
Right remote control mirror
Right seat heater switch
Right vanity light
Seat heater relay
Shift lock ecu
Sliding roof control ecu
Sliding roof control switch
Spiral cable
Steering sensor
Theft deterrent ecu
Theft deterrent indicator light
Trac off switch
Transponder key amplifier
Turn signal flasher
Turn signal switch
Unlock warning switch
W/ 6 speaker system
W/ 8 speaker system
Wireless door lock buzzer

Ground Distribution Wiring Diagram (4 of 4) for Toyota Highlander Limited 2003

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List of elements for Ground Distribution Wiring Diagram (4 of 4) for Toyota Highlander Limited 2003:

Ba (left center pillar)
Back door key lock & unlock switch
Back door lock unit
Bc (left side of rear crossmember)
Driver's seat control
Fuel pump & sender
High mounted stop- light
J/c 12 (on left rear of vehicle)
J/c 14 (left side of back door)
J/c 15 (under driver's seat)
Left buckle switch
Left rear combination light
Left rear door lock unit
Left rear power window switch
Left rear side marker light
Left seat heater
License plate light
Lumbar support control
R16
Rear interior light switch
Rear power outlet
Rear window defogger
Trailer converter
Trailer hitch

HEADLIGHTS

Headlights Wiring Diagram, with DRL for Toyota Highlander Limited 2003

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List of elements for Headlights Wiring Diagram, with DRL for Toyota Highlander Limited 2003:

(behind left head- light)
(in engine compt harness, at center of firewall) e3
(in engine compt harness, at left rear of engine compt) e4
(on right front of engine compt) engine room r/b 3
(on right side of engine compt)
A10
A13
Acc
Alt fuse 140a
Auto
Automatic light control sensor (on upper left side of dash)
B10
B11
B12
Becu
Body ecu (behind right side of dash)
C11
C12
Center j/b (behind upper center of dash)
Cltb
Clte
Clts
Combination meter
Combination switch
Dcty
Dimmer switch
Drl
Drl 2 relay
Drl 3 relay
Drl 4 relay
Drl fuse 7.5a
Ea (at right front fender apron)
Eb (at right front fender apron)
Ecu-b fuse 7.5a
Eg (under left headlight)
Engine room j/b (on left side of engine compt)
Engine room r/b (on left side of engine compt)
Ffgo
Ffog
Flash
Fog light relay
Foglight switch
Fr fog fuse 10a
Fusible link block (on left side of engine compt)
G10
Gnd1
H11
Head
Head lp left lower fuse 15a
Head lp left upper fuse 10a
Head lp right lower fuse 15a
Head lp right upper fuse 10a
Headlamp relay
High
High beam indicator
Hot at all times
Hot in on or acc
Hot in on or start
Hrly
Ia (at left kick panel)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 1
J/c 3
K10
Left front door courtesy switch
Left front fog light
Left high beam headlight
Left low beam head- light
Light control switch
Low
Main fuse 40a
Off
Parking brake switch
Passenger side j/b (behind right side of dash)
Pkb
Pnk
Radio 2 fuse 7.5a
Red
Right front fog light
Right high beam headlight
Right low beam head- light
Tail
Tail fuse 10a
Tail light relay
Trly

Headlights Wiring Diagram, without DRL for Toyota Highlander Limited 2003

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List of elements for Headlights Wiring Diagram, without DRL for Toyota Highlander Limited 2003:

(in dash harness, at top left side of dash) i3
(in engine compt harness, at left rear of engine compt) e4
A10
A13
Acc
Alt fuse 140a
B10
B11
B12
Becu
Body ecu (behind right side of dash)
C11
C12
Center j/b (behind upper center of dash)
Combination meter
Combination switch
Dcty
Dimmer switch
Ea (at right front fender apron)
Ecu-b fuse 7.5a
Eg (under left headlight)
Engine room j/b (on left side of engine compt)
Engine room r/b (on left side of engine compt)
Ffgo
Ffog
Flash
Fog light relay
Foglight switch
Fr fog fuse 10a
Fusible link block (on left side of engine compt)
G10
Gnd1
H11
Head
Head lp left lower fuse 15a
Head lp left upper fuse 10a
Head lp right lower fuse 15a
Head lp right upper fuse 10a
Headlamp relay
High
High beam indicator
Hot at all times
Hot in on or acc
Hot in on or start
Hrly
Ia (at left kick panel)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 1 (behind left head- light)
Junction connector 3 (on right side of engine compt)
K10
Left front door courtesy switch
Left front fog light
Left high beam head- light
Left low beam head- light
Light control switch
Low
Main fuse 40a
Off
Passenger side j/b (behind right side of dash)
Radio 2 fuse 7.5a
Red
Right front fog light
Right high beam head- light
Right low beam head- light
Tail
Tail fuse 10a
Tail light relay
Trly

HORN

Horn Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Horn Wiring Diagram for Toyota Highlander Limited 2003:

B12
Body ecu (behind right side of dash)
Combination switch
Engine room j/b (on left side of engine compartment)
Horn
Horn fuse 10a
Horn relay
Horn switch
Hot at all times
I2 (in dash harness, at left side of dash)
Left horn
Right horn
Sh-
Theft deterrent ecu (behind right side of dash)
Theft deterrent horn (on right side of engine compt)

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Instrument Cluster Wiring Diagram for Toyota Highlander Limited 2003:

(2wd)
(3.0l: on left front of engine)
(behind left side of dash) cruise control ecu
(behind upper center of dash) center j/b
2.4l
3.0l
A/t oil temp ind
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
Abs ind
Air bag ind
Air conditioning system
Anti-lock brakes system
B10
B11
B12
B13
B14
B15
B16
Beam ind
Brake ind
Buzzer
C11
C12
Center j/b (behind upper center of dash)
Charge ind
Combination meter
Computer data lines system
Cruise control system
Cruise ind
D11
Dome fuse 10a
Door ind
E10
Ect snow ind
Ecu-b fuse 7.5a
Engine control module (behind right side of dash)
Engine controls system
Engine room j/b (on left side of engine compt)
Engine room r/b (on left side of engine compt)
Exterior lights system
F13
Fr fog ind
Fuel gauge
Fuel ind
Fuel pump & sender (in fuel tank)
Fuel pump sender (sub) (at rear of vehicle)
G10
Head lp rh lwr 15a
Headlights system
Heater fuse 15a
Hot at all times
Hot in on or start
Hot w/ headlamp relay energized
Ib (at right dash brace)
Ign fuse 7.5a
Instrument panel j/b (behind left side of dash)
Interior lights system
K13
Lcd
Left turn ind
Malfunction ind lamp
Mops
Mpx2
O/d off ind
Oil level ind
Oil pressure ind
Oil pressure switch (2.4l: on left rear of engine)
Passenger side j/b (behind right side of dash)
Rheostat
Right turn ind
Seat belt ind
Slip ind
Spd
Speedometer
Tachometer
Tail ind
Trac off ind
Vsc ind
Washer level ind
Water temp gauge
Wiper/washer system

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Courtesy Lamps Wiring Diagram for Toyota Highlander Limited 2003:

A10
Acc
B11
B12
B6 (top left of rear hatch)
Bcty
Becu
Body ecu (behind right side of dash)
Center j/b (behind upper center of dash)
D12
D13
Dcty
Dcyl
Diode (rear interior light) (in roof, near rear hatch)
Dome fuse 10a
Door
Door d fr fuse 20a
Door p fr fuse 25a
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compt)
G10
Gnd1
H11
Harness, at left "a" pillar) b1
Hot at all times
Hot in on or acc
Hot in on or start
Ic (at right kick panel)
Ig1 fuse 7.5a
Ignition key cylinder illum- ination
Ile
Instrument panel j/b (behind left side of dash)
Interior light
J/c 12 (on left rear of vehicle)
J/c 14 (on left rear of vehicle)
K10
Left front door courtesy light
Left front door courtesy switch
Left rear door courtesy switch
Left vanity light
Off
Passenger side j/b (behind right side of dash)
Pcty
Pcyl
Personal light
Radio 2 fuse 7.5a
Rcty
Rear interior light
Rear interior light switch
Red
Right front door courtesy light
Right front door courtesy switch
Right rear door courtesy switch
Right vanity light
Tran- sponder key amplifier (ignition key cylinder illumi- nation)
W/ engine immobilizer
W/o engine immobilizer

Instrument Illumination Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Instrument Illumination Wiring Diagram for Toyota Highlander Limited 2003:

(6 spkr)
(8 spkr)
(behind upper center of dash) center j/b
A/c control assembly
A11
A12
Alt fuse 140a
Ashtray illum
B10
Body ecu (behind right side of dash)
C11
Center j/b (behind upper center of dash)
Cigarette lighter illum
Combination meter
Combination switch
Electronically controlled transmission pattern select switch illumination
F13
Front wiper deicer & mirror heater switch
Fusible link block (on left side of engine compt)
Glove box light
H10
Head
Hot at all times
Ia (at left kick panel)
Ib (at right dash brace)
Instrument panel j/b (behind left side of dash)
Left seat heater switch
Light control switch
O/d main switch illumi- nation
Off
Panel fuse 7.5a
Radio & player
Rheostat
Right seat heater switch
Tail
Taillight relay
Traction off switch (w/vsc 2wd)
Trly

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 4) for Toyota Highlander Limited 2003

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List of elements for Power Distribution Wiring Diagram (1 of 4) for Toyota Highlander Limited 2003:

A/c system
A/c system, cooling fans system
A/f fuse 25a
Abs system
Abs system, body computer system, cruise control system, engine controls system, exterior lights system, shift interlock system, transmissions system
Abs1 fuse 40a
Abs2 fuse 40a
Alt fuse 140a
Am1 fuse 40a
Am2 fuse 30a
B11
Battery
Body computer system, interior lights system, power windows system
Body computer system, power windows system
Cds fuse 30a
Coil
Computer data lines system
Contact
D fr door fuse 20a
D rr door fuse 20a
D12
D13
Defogger system
E10
Engine controls system
Engine room r/b (on left side of engine compt)
Exterior lights system
Foglight relay
Fr def fuse 20a
Fr fog fuse 10a
From s/roof fuse d (diagram 1 of 4)
Fusible link block (on left side of engine compt)
Generator
Heater fuse 50a
Instrument panel j/b (behind left side of dash)
Interior lights system
Interior lights system, power windows system, door locks system, anti- theft system
Main fusible link 3.0w
Nca
Obd fuse 7.5a
P fr door fuse 25a
P rr door fuse 20a
Panel fuse 7.5a
Pnk
Power fuse 30a
Power tops system
Rdi fuse 30a
Rr def fuse 30a
S/roof fuse 20a
Seat htr fuse 15a
Seats system
Starter
Stop fuse 20a
Tail fuse 10a
Taillight relay
To ignition switch (diagram 3 of 4)
To main fuse (diagram 2 of 4)
To power fuse (diagram 1 of 4)
To power outlet fuse (diagram 4 of 4)

Power Distribution Wiring Diagram (2 of 4) for Toyota Highlander Limited 2003

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List of elements for Power Distribution Wiring Diagram (2 of 4) for Toyota Highlander Limited 2003:

(w/ drl)
(w/o drl)
A/c system, anti-theft system, body computer system, door locks system, headlights system, instrument cluster system, interior lights system, power windows system, warning systems, abs system
Alt-s fuse 7.5a
Anti-theft system
Anti-theft system, body computer system, door locks system
Coil
Contact
Dome fuse 10a
Door lock fuse 20a
Drl 2 relay
Drl fuse 7.5a
Ecu-b fuse 7.5a
Efi fuse 20a
Efi relay
Engine controls system
Engine room j/b (on left side of engine compt)
Engine room r/b (on left side of engine compt)
Engine room r/b 3 (on right front of engine compt)
Exterior lights system
From fusible link block (diagram 1 of 4)
From main fuse g (diagram 2 of 4)
Garage door opener, instrument cluster system, interior lights system, body computer system, door locks system, warning systems
Hazard fuse 15a
Headlamp relay
Headlights system
Horn fuse 10a
Horn relay
Lh lwr head lp fuse 10a
Lh upr head lp fuse 10a
Main fuse 40a
Radio 1 fuse 25a
Rh lwr head lp fuse 10a
Rh upr head lp fuse 10a
Security fuse 15a
Short pin
Sound systems
Starting/ charging system
To short pin (diagram 2 of 4)
Towing fuse 20a

Power Distribution Wiring Diagram (3 of 4) for Toyota Highlander Limited 2003

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List of elements for Power Distribution Wiring Diagram (3 of 4) for Toyota Highlander Limited 2003:

A/c system, anti-theft system, body computer system, door locks system, headlights system, interior lights system, defogger system, warning systems
A/c system, cooling fans system, defogger system
Abs system
Acc
Am1
Am2
Anti-theft system, shift interlock system
Cruise control system
Cruise control system, exterior lights system, transmissions system, abs system
D10
Defogger system
Door locks system, anti-theft system, body computer system, power windows system
E5 (engine harness, left side of engine compt)
Ecu-ig fuse 15a
Engine controls system
Engine controls system, transmission system, instrument cluster system, cruise control system, abs system
Engine room r/b
Engine room r/b (on right front of engine compt)
Exterior lights system
From am1 fuse (diagram 1 of 4)
From am2 fuse (diagram 1 of 4)
From wiper fuse (diagram 3 of 4)
G13
Heater fuse 15a
Ig1
Ig1 fuse 7.5a
Ig2
Ig2 fuse 15a
Ign fuse 7.5a
Ignition switch
Instrument panel j/b (behind left side of dash)
K10
K13
Lock
Pnk
Power tops system
Rr wip fuse 15a
Seats system
Srs-ig fuse 15a
St2
Start
Starter fuse 7.5a
Starter relay
Starting/ charging system
Starting/charging system, engine controls system
To ig1 fuse (diagram 3 of 4)
To radio 2 fuse (diagram 4 of 4)
Washer fuse 20a
Wiper fuse 25a
Wiper/ washer system

Power Distribution Wiring Diagram (4 of 4) for Toyota Highlander Limited 2003

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List of elements for Power Distribution Wiring Diagram (4 of 4) for Toyota Highlander Limited 2003:

A/c system, sound systems
Acc relay
Bc (left side of rear crossmember)
Center j/b (behind upper center of dash)
Cig fuse 15a
Cigarette lighter
D14
F13
From ignition switch (diagram 3 of 4)
From instrument panel j/b (diagram 1 of 4)
Front power outlet
Headlights system, interior lights system, body computer system, warning systems, power windows system, door locks system, anti-theft system, shift interlock system, mirrors system
Ia (left kick panel)
Ib (right instrument panel brace)
Instrument panel j/b (behind left side of dash)
J/c 12 (on left rear of vehicle)
Pnk
Power outlet fuse 15a
Radio 2 fuse 7.5a
Rear power outlet
Sound systems

POWER DOOR LOCKS

Power Door Locks Wiring Diagram, with Keyless Entry (1 of 2) for Toyota Highlander Limited 2003

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List of elements for Power Door Locks Wiring Diagram, with Keyless Entry (1 of 2) for Toyota Highlander Limited 2003:

Ba (at left center pillar)
Bb (at right center pillar)
Bdr
Computer data lines system
Cpub
D fr door fuse 20a
Door lock control switch
Gnd
H11
Hot at all times
Hot in acc or on
Hot in on or start
Ia (at left kick panel)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 12 (on left rear of vehicle)
Junction connector 6 (left side of dash, behind instrument cluster)
K10
Kul
Left front door courtesy switch
Left front door lock motor, door unlock detection switch & door key lock & unlock switch
Left rear door courtesy switch
Left rear door lock motor & door unlock detection switch
Lssr
Lsw
Lswe
Mpx1
Mpx2
Passenger side j/b (behind right side of dash)
Pnk
Power window master switch w/ ecu
Radio 2 fuse 7.5a
Red
Right front door courtesy switch
Right rear door courtesy switch
Right rear door lock motor & door unlock detection switch
Sig
Unlock warning switch (in steering column)
Wireless door lock buzzer (on left rear of engine compt)

Power Door Locks Wiring Diagram, with Keyless Entry (2 of 2) for Toyota Highlander Limited 2003

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List of elements for Power Door Locks Wiring Diagram, with Keyless Entry (2 of 2) for Toyota Highlander Limited 2003:

A10
Acc
Act+
Act-
Act- back door lock motor & door unlock detection switch
Actd
B10
B11
B12
Bcty
Bd (at right side of rear crossmember)
Bdr1
Be (at left side of back door)
Becu
Body ecu (behind right side of dash)
Bzr
Center j/b (behind upper center of dash)
Computer data lines system
D12
D13
Dcty
Dome fuse 10a
Door lock fuse 25a
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compt)
Exterior lights system
G10
Gnd1
Haz
Hot at all times
Ia (at left kick panel)
Instrument panel j/b (behind left side of dash)
Interior lights system
Junction connector 10 (on left rear of vehicle)
Junction connector 11
Junction connector 12 (on left rear of vehicle)
Junction connector 14
Junction connector 5 (left side of dash, behind instrument cluster)
Ksw
Lssr
Lswa
Lswp
Mpx1
Mpx2
Obd2
Passenger side j/b (behind right side of dash)
Pcty
Pkl
Pkul
Pml
Pmul
Pnk
Prg
Rcty
Rda
Rear interior light switch
Red
Right front door lock motor, door unlock detection switch & door key lock & unlock switch
Wireless door lock ecu (on right side of luggage compt)

Power Door Locks Wiring Diagram, without Keyless Entry (1 of 2) for Toyota Highlander Limited 2003

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List of elements for Power Door Locks Wiring Diagram, without Keyless Entry (1 of 2) for Toyota Highlander Limited 2003:

(at left kick panel) ia
(behind right side of dash) passenger side j/b
Ba (at left center pillar)
Back door key lock & unlock switch
Bb (at right center pillar)
Bdr
Be (at left side of back door)
Cpub
D fr door fuse 20a
Door lock control switch
Gnd
H11
Hot at all times
Hot in acc or on
Hot in on or start
Ia (at left kick panel)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
Junction connector (on left rear of vehicle)
Junction connector 14
Junction connector 6 (left side of dash, behind instrument cluster)
K10
Kul
Left front door courtesy switch
Left front door lock motor, door unlock detection switch & door key lock & unlock switch
Left rear door courtesy switch
Left rear door lock motor & door unlock detection switch
Lssr
Lsw
Lswe
Mpx1
Mpx2
Option connector 1 (w/o anti-theft) (behind left kick panel)
Passenger side j/b (behind right side of dash)
Pnk
Power window master control switch w/ ecu
Radio 2 fuse 7.5a
Red
Right front door courtesy switch
Right rear door courtesy switch
Right rear door lock motor & door unlock detection switch
Sig
Unlock warning switch

Power Door Locks Wiring Diagram, without Keyless Entry (2 of 2) for Toyota Highlander Limited 2003

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List of elements for Power Door Locks Wiring Diagram, without Keyless Entry (2 of 2) for Toyota Highlander Limited 2003:

(w/ anti-theft)
(w/o anti-theft)
A10
Acc
Act+
Act-
Act- back door lock motor & door unlock detection switch
Actd
B10
B11
B12
Bcty
Bdr1
Be (at left side of back door)
Becu
Body ecu (behind right side of dash)
Center j/b (behind upper center of dash)
Computer data lines system
Dcty
Door lock fuse 25a
Door unlock detection switch & door key lock & unlock switch
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compt)
G10
Gnd1
Hot at all times
Ia (at left kick panel)
Instrument panel j/b (behind left side of dash)
Junction connector 10 (on left rear of vehicle)
Junction connector 12 (on left rear of vehicle)
Junction connector 14
Junction connector 5 (left side of dash, behind instrument cluster)
Ksw
Lssr
Lswa
Lswp
Mpx1
Mpx2
Obd2
Passenger side j/b (behind right side of dash)
Pcty
Pkl
Pkul
Pml
Pmul
Pnk
Rcty
Rear interior light switch
Red
Right front door lock motor,
Theft deterrent ecu (behind right side of dash)

POWER MIRRORS

Power Mirrors Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Power Mirrors Wiring Diagram for Toyota Highlander Limited 2003:

Center j/b (behind upper center of dash)
Defogger system
Down
E11
F13
Hot in acc or on
Ib (at right dash brace)
Instrument panel j/b (behind left side of dash)
Left
Left remote control mirror
Left/ up
Operation switch
Passenger side j/b (right right side of dash)
Radio 2 fuse 7.5a
Red
Remote control mirror switch
Right
Right remote control mirror
Right/ down
Select switch

POWER SEATS

Heated Seats Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Heated Seats Wiring Diagram for Toyota Highlander Limited 2003:

(in dash harness, at top right side of dash)
Ba (at left center pillar)
Center j/b (behind upper center of dash)
F13
Hot at all times
Hot in on or start
Ib (at right dash brace)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
Interior lights system
Junction connector 11 (on right rear of vehicle)
Junction connector 15 (under driver's seat)
Left seat heater
Lfft seat heater switch
Passenger side j/b (behind right side of dash)
Pnk
R/b 1 (left of instrument panel j/b)
Right seat heater
Right seat heater switch
Seat heater relay
Seat htr fuse 15a

Power & Lumbar Seat Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Power & Lumbar Seat Wiring Diagram for Toyota Highlander Limited 2003:

Ba (at left center pillar)
Down
Driver's power seat control switch
Front
Front vertical
Hot at all times
Instrument panel j/b (behind left side of dash)
Junction connector (under driver's seat)
Junction connector 15 (under driver's seat)
Power fuse 30a
Power seat control switch (lumbar support control)
Power seat motor (front vertical control)
Power seat motor (lumbar support control)
Power seat motor (rear vertical control)
Power seat motor (reclining control)
Power seat motor (slide control)
Rear
Rear vertical
Reclining
Slide

POWER TOP/SUNROOF

Power Top/Sunroof Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Power Top/Sunroof Wiring Diagram for Toyota Highlander Limited 2003:

Cls
Computer data lines system
Ecu-ig fuse 15a
Hot at all times
Hot in on or start
Ic (at right kick panel)
Instrument panel j/b (behind left side of dash)
Ls1
Ls2
Moon roof motor
Mpx1
Opn
Pnk
S/roof fuse 20a
Slide close/ tilt up
Slide open/ tilt down
Sliding roof control ecu (on front of sliding roof)
Sliding roof control switch

POWER WINDOWS

Power Windows Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Power Windows Wiring Diagram for Toyota Highlander Limited 2003:

A10
Acc
B10
B11
B12
Ba (at left center pillar)
Bb (at right center pillar)
Bdr
Becu
Body ecu (behind right side of dash)
Center j/b (behind upper center of dash)
Computer data lines system
Cpub
D fr door fuse 20a
D rr door fuse 20a
D12
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compt)
F13
G10
Gnd
Gnd1
Gnd2
H11
Hot at all times
Hot in acc or on
Hot in on or start
I10
I11
Ib (at right dash brace)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
K10
Kul
L10
Left front door key lock & unlock switch
Left front power window motor
Left rear power window motor
Left rear power window switch
Limit switch
Lmt
Lswe
Mpx1
Mpx2
P fr door fuse 25a
P rr door fuse 20a
Passenger side j/b (behind right side of dash)
Pct
Pls
Pnk
Power window master switch with ecu
Pulse sensor
Pws
Radio 2 fuse 7.5a
Red
Right front power window motor
Right front power window switch
Right rear power window motor
Right rear power window switch
Rld
Rlu
Rrd
Rru
Sgnd
Sig

RADIO

Radio Wiring Diagram, 6 Speaker System for Toyota Highlander Limited 2003

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List of elements for Radio Wiring Diagram, 6 Speaker System for Toyota Highlander Limited 2003:

A13
Acc
Center j/b (behind upper center of dash)
Engine room j/b (on left side of engine compt)
Fl+
Fl-
Fr+
Fr-
Gnd
Hot at all times
Hot in acc or on
Ib (at right dash brace)
Ill
Instrument panel j/b (behind left side of dash)
Interior lights system
Left front door speaker
Left rear door speaker
Left tweeter
Pnk
Radio & player
Radio 1 fuse 25a
Radio 2 fuse 7.5a
Red
Right front door speaker
Right rear door speaker
Right tweeter
Rl+
Rl-
Rr+
Rr-

Radio Wiring Diagram, 8 Speaker System for Toyota Highlander Limited 2003

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List of elements for Radio Wiring Diagram, 8 Speaker System for Toyota Highlander Limited 2003:

A13
Acc
Amp
Amp+
Ant
Beep
Center j/b (behind upper center of dash)
Engine room j/b (on left side of engine compt)
Fl+
Fl-
Fr+
Fr-
Front antenna amplifier (behind center of dash)
Gnd
Hot at all times
Hot in acc or on
Ib (at right dash brace)
Illum
Instrument panel j/b (behind left side of dash)
Interior lights system
J/c 11 (on right rear of vehicle)
K10
Left front door speaker
Left rear door speaker
Left tweeter
Mute
Nca
Passenger side j/b (behind right side of dash)
Pnk
Radio & player
Radio 1 fuse 25a
Radio 2 fuse 7.5a
Rear antenna amplifier (in left rear of vehicle)
Red
Right front door speaker
Right rear door speaker
Right tweeter
Rl+
Rl-
Rr+
Rr-
S22
S23
Sdg3
Sgnd
Stereo power amplifier (in luggage compartment)

SHIFT INTERLOCK

Shift Interlock Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Shift Interlock Wiring Diagram for Toyota Highlander Limited 2003:

Acc
Center j/b (behind upper center of dash)
Ecu-ig fuse 15a
F13
Hot at all times
Hot in acc or on
Hot in on or start
Ib (at right dash brace)
Ic (at right kick panel)
Instrument panel j/b (behind left side of dash)
Key interlock solenoid
Kls+
Nca
Passenger side j/b (behind right side of dash)
Radio 2 fuse 7.5a
Shift lock control switch
Shift lock ecu (at base of shifter lever)
Shift lock solenoid
Sls+
Sls-
Stop fuse 20a
Stoplight switch (above brake pedal)
Stp

STARTING/CHARGING

Charging Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Charging Wiring Diagram for Toyota Highlander Limited 2003:

2.4l
3.0l
Alt fuse 140a
Alt-s fuse 7.5a
Battery
Battery ground
C11
Center j/b (behind upper center of dash)
Charge warning light
Combination meter
Computer data lines system
Ecu-ig fuse 15a
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compt)
Fusible link block (on left side of engine compartment)
Generator
Heater fuse 15a
Hot in on or start
Instrument panel j/b (behind left side of dash)
K13
Nca
Passenger side j/b (behind right side of dash)

Starting Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Starting Wiring Diagram for Toyota Highlander Limited 2003:

(2.4l)
(3.0l)
2.4l
3.0l
Acc
Am2 fuse 30a
Battery
Battery ground
Ec (at right side of surge tank)
Ef (at left side of cylinder block)
Engine control module (behind right side of dash)
Engine room r/b (on left side of engine compt)
Fusible link block (on left side of engine compt)
Ignition switch
Nca
Nsw
Off
P/n
Park/ neutral position switch (on left side of transmission)
Sta
Start
Starter
Starter fuse 7.5a
Starter relay

SUPPLEMENTAL RESTRAINTS

Supplemental Restraints Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Supplemental Restraints Wiring Diagram for Toyota Highlander Limited 2003:

(at left center pillar) ba
(at left kick panel) ia
(front passenger air bag assembly) air bag squib
(in body harness, under center console) b3
(steering wheel pad) air bag squib
(under left side of dash) (partial) data link connector (dlc) 3
+sl
+sr
-sl
-sr
4 cyl
6 cyl
A12
A16
A17
A18
Air bag
Air bag sensor assembly (below shifter console)
B11
Body ecu (behind right side of dash)
C11
Center j/b (behind upper center of dash)
Combination meter
D14
Dbkl
E11
Engine control module (behind right side of dash)
Esl
Esr
F/ps
Gsw2
Heater fuse 15a
Hot in on or start
Ig1
Ig2
Ign fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 11 (on right rear of vehicle)
J/c 15 (under driver's seat)
J/c 6 (left side of dash, behind combination meter)
J/c 9 (behind left kick panel)
K13
L10
Lbe+
Left buckle switch
Left front air bag sensor (on left front of vehicle)
Left pretensioner (at base of left "b" pillar)
Left side air bag sensor (w/side air bag) (at base of left "b" pillar)
Left side air bag squib (w/side air bag)
Passenger side j/b (behind right side of dash)
Pbkl
Pl+
Pl-
Pnk
Pr+
Pr-
Rbe+
Right buckle switch
Right front air bag sensor (on right front of vehicle)
Right pretensioner (at base of right "b" pillar)
Right side air bag sensor (w/side air bag) (at base of right "b" pillar)
Right side air bag squib (w/side air bag)
Seat belt warning occupation detection sensor (under passenger's seat)
Sfl+
Sfl-
Sfr+
Sfr-
Sil
Solid state
Srs-ig fuse 15a
Ssl+
Ssl-
Ssr+
Ssr-
Vupl
Vupr

TRANSMISSION

2.4L

2.4L, A/T Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003

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List of elements for 2.4L, A/T Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003:

(dash harn, right side of dash) i6
(engine harn, rear of engine) e9
(left side of engine compt) counter gear speed sensor
(on side of transmission) turbine speed sensor
Batt
Cruise control ecu (behind left side of dash)
Driver side j/b (behind left side of dash)
Dsl
E01
E02
E03
E04
E05
Ect
Ee (on intake side of cylinder block)
Ef (left side of cylinder block)
Efi fuse 20a
Efi relay
Electronically controlled transmission solenoid (on left side of transaxle)
Engine control module (behind right side of dash)
Engine coolant temperature sensor (left rear of engine)
Engine room j/b (on left side of engine compt)
Hot at all times
Hot in on or accy
Ign fuse 7.5a
Igsw
Instrument panel j/b (behind left side of dash)
J/c 2 (under left headlight)
J/c 7 (behind right side of dash)
M12
Mpx1
Mpx2
Mrel
Nc+
Nc-
Nt+
Nt-
Od1
Odlp
Odms
Pnk
Red
Sl1+
Sl1-
Sl2+
Sl2-
Slt+
Slt-
Spd
Stop fuse 20a
Stop- light switch (above brake pedal)
Stp
Tho
Throttle position sensor (on side of throttle body)
Thw
Vta1

2.4L, A/T Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003

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List of elements for 2.4L, A/T Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003:

(engine harn, behind right side of dash) i6
A/c control assembly
A/t indicator switch (on left side of transmission)
A10
A11
B10
Body ecu (behind right side of dash)
C11
C12
Center j/b (behind upper center of dash)
Combination meter
Electronically controlled transmission pattern sensor
F13
Hot in on or start
Ib (right dash brace)
Ign 1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 6 (behind left side of dash)
Mpx+
Mpx-
Mpx1
Mpx2
O/d main switch
O/d off
Passenger side j/b (behind right side of dash)
Power window master switch w/ ecu
S10
S11
Skid control ecu (above instrument panel j/b)
Snow
W/ vsc
W/o vsc

3.0L

3.0L, A/T Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003

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List of elements for 3.0L, A/T Wiring Diagram (1 of 2) for Toyota Highlander Limited 2003:

(engine harn, behind right side of dash) i6
(left side of engine compt) counter gear speed sensor
(on side of transmission) turbine speed sensor
Batt
Cruise control ecu (behind left side of dash)
Driver side j/b (behind left side of dash)
Dsl
E01
E02
E03
E04
E05
E7 (engine harn, left side of engine)
Ec (right side of surge tank)
Ect
Ed (rear side of surge tank)
Efi fuse 20a
Efi relay
Electronically controlled transmission solenoid (on left side of transaxle)
Engine control module (behind right side of dash)
Engine coolant temperature sensor (front center of engine)
Engine room j/b (on left side of engine compt)
Hot at all times
Hot in on or accy
Ign fuse 7.5a
Igsw
Instrument panel j/b (behind left side of dash)
J/c 2 (under left headlight)
J/c 7 (behind right side of dash)
M12
Mpx1
Mpx2
Mrel
Nc+
Nc-
Nt+
Nt-
Od1
Odlp
Odms
Pnk
Red
Sl1+
Sl1-
Sl2+
Sl2-
Slt+
Slt-
Spd
Stop fuse 20a
Stop- light switch (above brake pedal)
Stp
Tho
Throttle position sensor (on side of throttle body)
Thw
Vta1

3.0L, A/T Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003

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List of elements for 3.0L, A/T Wiring Diagram (2 of 2) for Toyota Highlander Limited 2003:

A/c control assembly
A/t indicator switch (on left side of transmission)
A10
A11
B10
Body ecu (behind right side of dash)
C11
C12
Center j/b (behind upper center of dash)
Combination meter
Dash)
Electronically controlled transmission pattern sensor
F13
Hot in on or start
Ib (right dash brace)
Ign 1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 8 (behind right side of d
Mpx+
Mpx-
Mpx1
Mpx2
O/d main switch
O/d off
Passenger side j/b (behind right side of dash)
Power window master switch w/ ecu
S10
S11
Skid control ecu (above instrument panel j/b)
Snow
W/ vsc
W/o vsc

WARNING SYSTEMS

Warning Systems Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Warning Systems Wiring Diagram for Toyota Highlander Limited 2003:

(2.4l) (3.0l)
(3.0l) (2.4l)
A/c control assembly (behind center of dash)
A10
A11
Acc
B10
B11
B12
B3 (w/ seat heater)
Ba (at left center pillar)
Bd (at right side of rear crossmember)
Becu
Body ecu (behind right side of dash)
Buzzer
C11
C12
Center j/b (behind upper center of dash)
Combination meter
D11
Dbkl
Dcty
Dome fuse 10a
Door ind
E5 e5
Ecu-b fuse 7.5a
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compt)
G10
Heater fuse 15a
Hot at all times
Hot in acc or on
Hot in on or start
Ib (at right dash brace)
Ic (at right kick panel)
Ig1 fuse 7.5a
Instrument panel j/b (behind left side of dash)
J/c 11 (on right rear of vehicle)
J/c 15 (under driver's seat)
J/c 6 (left side of dash, behind instrument cluster)
J/c 9 (behind left kick panel)
K10
K13
Ksw
Left buckle switch
Left front door courtesy switch
Mpx+
Mpx-
Mpx1
Mpx2
Passenger seat belt warning ind
Passenger side j/b (behind right side of dash)
Pbkl
Power window master switch with ecu
Radio 2 fuse 7.5a
Right buckle switch
Seat belt ind
Seat belt warning occupant detection sensor (under passenger's seat)
Unlock warning switch (in steering column)

WIPER/WASHER

Front Wiper/Washer Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Front Wiper/Washer Wiring Diagram for Toyota Highlander Limited 2003:

(on right front of engine compt) washer motor
C11
C12
C14
Combination meter
Combination switch
D14
Ea (at right front fender apron)
Front washer switch
Front wiper motor (on left rear of engine compt)
Front wiper switch
High
Hot in on or start
Ia (at left kick panel)
Ign fuse 7.5a
Instrument panel j/b (behind left side of dash)
Int
Int time
Junction connector 13 (on left rear of vehicle)
Low
Off
Passenger side j/b (behind right side of dash)
Red
Solid state
Washer fuse 20a
Washer level ind
Washer level switch (on right front of engine compt)
Wiper fuse 25a

Rear Wiper/Washer Wiring Diagram for Toyota Highlander Limited 2003

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List of elements for Rear Wiper/Washer Wiring Diagram for Toyota Highlander Limited 2003:

C14
Combination switch
D14
Hot in on or start
Ia (at left kick panel)
Instrument panel j/b (behind left side of dash)
Int
Off
Passenger side j/b (behind right side of dash)
Pnk
Rear wiper & washer switch
Rear wiper motor
Rr wip fuse 15a
Washer 1
Washer 2
Washer fuse 20a
Washer motor (on right front of engine compt)