All Wiring Diagrams for Lexus RX 300 2003

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 2) for Lexus RX 300 2003

List of elements for Automatic A/C Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(behind upper center of dash) j/b 3
(in dash harness, behind right side of dash)
A/c ambient temperature sensor (behind left front grille)
A/c evaporator temperature sensor (behind right side of dash)
A/c room temperature sensor (behind left center of dash)
A/c solar sensor (behind upper left side of dash)
A10
A13
Abs ind
Acc
Aif
Air
Air inlet control servo motor (behind right side of dash)
Air mix control servo motor (behind right side of dash)
Air vent mode control servo motor (behind right side of dash)
Amc
Amh
Anti-lock brakes system
Aod
Aof
B1+
B12
Blw
Brake ind
C12
C13
C14
Cds fuse 40a
Cellular phones system instrument cluster system
Comb mtr input
Combination meter ecu (behind combination meter)
Computer data lines system exterior lights system
Cruise control system
Cruise ind
E10
Engine controls system
Exterior lights system
Fusible link block (in engine room j/b)
Gauge fuse 7.5a
Gnd
Gnd1
Headlights system
Heater fuse 15a
Heater fuse 50a
High beam
High beam ind
Hot at all times
Hot in on or acc
Hot in on or start
I10
I11
I16
I18
Ig+
Ih (at right dash brace)
Instrument cluster system
Instrument control panel
Instrument panel j/b (behind left side of dash)
Interior lights system
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
K10
K13
Mal ind
Mpx+
Mpx-
Multi display
O/d off ind
Pnk
Radio 2 fuse 7.5a
Rdi fuse 40a
Red
S5-1
S5-2
S5-3
Sg-1
Sg-2
Sg-3
Sg-5
Slip ind
Srs ind
Tam
Tel1
Tpi
Tpo
Trac off ind
Turn left sig
Turn right sig
Tx+
Tx-
W/ nav
W/o nav
W/o nav red

Automatic A/C Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Automatic A/C Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(at rear of surge tank) ec
A/c condenser fan motor (in right front of engine compt)
A/c magnetic clutch & lock sensor (on a/c compressor assembly)
A/c triple pressure switch
Acmg
Blower motor (behind right side of dash)
Blower motor control relay (near blower motor)
Body ecu (behind left side of dash)
Computer data lines system
Diode (a/c) (behind upper left side of dash)
Dome fuse 10a
Dual
E10 (in engine harness, at left front of engine compt)
E9 (near battery)
Ea (at right side of engine compt)
Ecu-b fuse 7.5a
Ed (at left side of radiator support)
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compt)
Fan 1 relay
Fan 2 relay
Fan 3 relay
G10
Gnd
Heater relay (beside instrument panel j/b)
Hot at all times
Ig (behind right kick panel)
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
Junction connector 1 (in engine compt, on right front fender)
Junction connector 10 (behind right side of dash)
Junction connector 2 (in left front of engine compt, behind headlight)
Junction connector 4 (behind left kick panel)
Junction connector 9 (behind right kick panel)
Lcki
Mg clt relay
Mpx1
Mpx2
Pre
R/b 2 (in engine room j/b)
Radiator fan motor (in left front of engine compt)
Red
Red c
Single
Water temperature switch 1 (in right front of engine compt)
Water temperature switch 2 (on top rear of engine)

ANTI-LOCK BRAKES

Anti-lock Brakes Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Anti-lock Brakes Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(behind upper left side of dash) j/b 5
(in engine room j/b)
+b1
A33
A37
A38
Abs & ba & trac & vsc actuator (on right front of engine compt)
Abs & ba & trac & vsc ecu (behind right side of dash)
Abs fuse 60a
Abs motor relay
Abs sol relay
Ast
Ast fuse 7.5a
B11
Brake fluid level switch (in brake fluid reservoir)
D14
E14 (in engine harness, at right fender)
Ea (at right side of engine compt)
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compt)
Fl+
Fl-
Fr+
Fr-
Fss
Fusible link block
Gnd1
Gnd2
Gnd3
Gnd4
Hot at all times
I14 (in dash harness, behind upper right side of dash)
If (behind center of dash)
Ig (at right kick panel)
Instrument panel j/b (behind left side of dash)
Junction connector 9 (behind right kick panel)
Lbl
Left front abs speed sensor (on left front wheel hub bracket)
Master cylinder pressure sensor (on right side of engine compt)
Mr2
Nca
Pmc
Pnk
R/b 2 (in engine room j/b)
R/b 4 (on right side of engine compt)
R2+
Red
Right front abs speed sensor (on right front wheel hub bracket)
Sflh
Sflr
Sfrh
Sfrr
Sm1+
Sm1-
Sm2+
Sm2-
Src1
Src2
Srlh
Srlr
Srm1
Srm2
Srrh
Srrr
Vcm

Anti-lock Brakes Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Anti-lock Brakes Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(2wd)
(at right kick panel)
(behind left end of dash) vsc warning buzzer
(in dash harness, behind center of dash)
(in dash harness, behind upper right side of dash) i13
(in steering column, behind steering wheel) steering angle sensor
(under left side of dash)
+bo
A/t indicator switch (integral to park/neutral position switch)
A39
A40
Abs & ba & trac & vsc ecu (behind right side of dash)
Abs ind
Bat
Brake ind
Brake pedal load sensing switch
Brl
C12
C13
C14
Ccs
Combination meter ecu
Cruise control ecu (behind left side of dash)
Csw
D/g
D10
Data link connector 3 (under left side of dash)
Deceleration sensor (below center of dash, on transmission tunnel)
E11
Ecu-ig fuse 15a
Eng+
Eng-
Eng- eng+
Engine control module (behind right side of dash)
Ess
Fsw+
Fsw-
Gauge fuse 7.5a
Ggnd
Gl1
Gl2
Gss
Gyaw
Headlights system
Heater fuse 15a
Hot at all times
Hot in on or start
Ig1
Ih (at right dash brace)
Ind
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side
J/b 5 (behind upper left side of dash)
Junction connector 8 (behind right side of dash)
Junction connector 9 (behind right kick panel)
K13
Left rear abs speed sensor (on left rear wheel hub bracket)
Nca
Neo
Of dash)
Parking brake switch
Pkb
Pnk
Pro
Red
Right rear abs speed sensor (on right rear wheel hub bracket)
Rl+
Rl-
Rlo
Rr+
Rr-
Sil
Slip ind
Sp1
Ss1+
Ss1-
Stop fuse 20a
Stoplight switch
Stp
Trac off ind
Traction cut switch (2wd)
Trc+
Trc-
Trig
Vgs
Vsc ind
Vscw
Vys
Yaw rate sensor (on left rear of vehicle)
Yaw2
Yss

ANTI-THEFT

Anti-theft Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Anti-theft Wiring Diagram (1 of 2) for Lexus RX 300 2003:

A10
B11
Bcty
Bdr
Bdsl
Bdsu
Becu
Body ecu (behind left side of dash)
Bsub
C14
Combination meter ecu (behind combination meter)
Cpub
Cty
Ctye
D rr door fuse 20a
D12
Door locks system
Driver door ecu (in left front door)
Engine control module (behind right side of dash)
F10
F11
F13
Front passenger door ecu (in right front door)
G10
Gauge fuse 7.5a
Gnd
Gnd1
Gnd2
Hcty
Hot at all times
Hot in on or start
I16
I18
I5 (in dash harness, behind left side of dash)
I8 (in dash harness, behind left side of dash)
Ih (at right dash brace)
Imld
Ind
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind left kick panel)
J/c 5 (behind upper left side of dash)
J/c 9 (behind right kick panel)
K10
Ksw
Kul
Left front door courtesy switch
Lsw
Lswa
Lswe
Mpx+
Mpx-
Mpx1
Mpx2
P fr door fuse 20a
P rr door fuse 20a
Pnk
Rdr+
Rdr-
Right front door courtesy switch
Sig
Theft deterrent indicator light
W/ navigation
W/o navigation

Anti-theft Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Anti-theft Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(at bottom of right ``b" pillar) bk
(in steering column) transponder key amplifier
A j4
Ant1
Ant2
Back door courtesy switch
Bdr
Bj (at bottom of left ``b" pillar)
Bn (at center of rear panel)
Code
Cpub
Cty
Ctye
Door locks system
Ea (at right side of engine compt)
Ecu-b fuse 7.5a
Efi fuse 20a
Efi relay
Engine control module
Engine hood courtesy switch (on front center of engine compartment)
Engine room j/b (on left side of engine compartment)
Fl door fuse 20a
Gnd
Hot at all times
I5 (in dash harness, behind left side of dash)
I6 (behind center of dash)
If (behind center of dash)
J/c 1 (in engine compartment, on right front fender)
J/c 14 (in left side of liftgate)
J/c 2 (behind headlight)
J/c 3 & 4 (behind left kick panel)
J/c 7 (behind upper left side of dash)
J4 a
Left rear door courtesy switch
Left rear door ecu (in left rear door)
Lsw
Lswe
Mpx1
Mpx2
Mrel
Pnk
Right rear door courtesy switch
Right rear door ecu (in right rear door)
Rkck
Sel1
Sig
Theft deterrent horn (in right rear corner of engine compartment)
Transponder key coil
Txct
Txlt
Unlock warning switch

BODY CONTROL MODULES

Body Control Modules Wiring Diagram for Lexus RX 300 2003

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List of elements for Body Control Modules Wiring Diagram for Lexus RX 300 2003:

(at right dash brace)
(in dash harness, behind center of dash) i6
A10
Acc
Air conditioning system
Anti-theft & door locks systems
Anti-theft & engine controls systems
Anti-theft system
Bcty
Bdsl
Bdsu
Becu
Body ecu (behind left side of dash)
Bsub
Bzr
Bzr2
Cltb
Clte
Clts
Computer data lines system
Dbkl
Defogger system
Dfg
Door locks system
Door locks, headlights, interior lights & power windows systems
Drl
Exterior lights system
F11
F13
Ffgo
Ffog
Gauge fuse 7.5a
Gnd1
Gnd2
Haz
Hcty
Head
Headlights system
Horn
Horns system
Hot at all times
Hot in acc or on
Hot in on or start
Hrly
Ile
Ind
Instrument panel j/b (behind left side of dash)
Interior lights system
J/b 3 (behind upper center of dash)
Junction connector 5 (behind upper left side of dash)
K10
Ksw
Lswa
Mpx1
Mpx2
Obd2
P fr door fuse 20a
Pkb
Pnk
Power tops system
Radio 2 fuse 7.5a
Rco
Rda
Rdr+
Rdr-
Red
Rr wip fuse 15a
Rssi
Rwc1
Rwig
Rwlm
Rwls
Rwsw
Rww
Snow
Stpi
Tail
Transmissions system
Trly
Warning system
Wig
Wiper/washer system

COMPUTER DATA LINES

Computer Data Lines Wiring Diagram for Lexus RX 300 2003

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List of elements for Computer Data Lines Wiring Diagram for Lexus RX 300 2003:

(behind center of dash) if
A10
A39
A40
Abs & ba & trac & vsc ecu (behind right side of dash)
B1 (in body harness, at left rear door)
B11
Bat
Body ecu (behind left side of dash)
C/c
C12
C13
C14
Center air bag sensor assembly (under center of dash, forward of center console)
Combination meter ecu (behind combination meter)
Cruise control ecu (behind left side of dash)
Cruise ind
D/g
Data link connector 3 (under left side of dash)
Driver door ecu (in left front door)
Ec (at rear of surge tank)
Engine control module (behind right side of dash)
Front passenger door ecu (in right front door)
Hot at all times
I12 (in dash harness, behind right side of dash)
I16
I18
I6 (in dash harness, behind center of dash)
I9 (in dash harness, behind left side of dash)
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
Junction connector 10 (behind right side of dash)
Left rear door ecu (in left rear door)
Moon roof control ecu (on front center of moon roof)
Mpx+
Mpx-
Mpx1
Mpx2
Multi- display
Obd fuse 7.5a
Obd2
P18
Power seat ecu (under driver's seat)
Right rear door ecu (in right rear door)
Sil
Tac
Tach
W/ navigation
W/o navigation

COOLING FAN

Cooling Fan Wiring Diagram for Lexus RX 300 2003

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List of elements for Cooling Fan Wiring Diagram for Lexus RX 300 2003:

A/c condenser fan motor (in right front of engine compt)
A/c diode (behind upper left side of dash)
A/c triple pressure switch (on refrigerant line, near receiver-drier)
Acmg
Cds fuse 40a
E10 (in engine harness, at left front of engine compt)
E6 (in engine harness, at rear of engine)
Ea (at right side of engine compt)
Ed (at left side of radiator support)
Engine control module (behind right side of dash)
Engine controls system
Engine coolant temperature (on top front of engine)
Engine room j/b (on left side of engine compartment)
Fan 1 relay
Fan 2 relay
Fan 3 relay
Fusible link block (in engine room j/b)
Heater fuse 15a
Hot at all times
Hot in on or start
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
Junction connector 1 (in engine compt, on right front fender)
Junction connector 2 (in left front of engine compt, behind headlight)
R/b 2 (in engine room j/b)
Radiator fan motor (in left front of engine compartment)
Rdi fuse 40a
Single
Thw
Water temperature switch 1 (in right front of engine compartment)
Water temperature switch 2 (on top rear 0f engine)

CRUISE CONTROL

Cruise Control Wiring Diagram for Lexus RX 300 2003

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List of elements for Cruise Control Wiring Diagram for Lexus RX 300 2003:

(in dash harness, behind center of dash) i6
A40
Abs & ba & trac & vsc ecu (behind right side of dash)
B11
B13
C/c
C12
C13
C14
Cancel
Ccs
Combination meter ecu (behind combination meter)
Combination switch
Cruise
Cruise control actuator (on left rear of engine)
Cruise control ecu (behind left side of dash)
Cruise control ind
Cruise control switch
Data link connector 3 (under left side of dash)
E11
Ecc
Ect
Ecu-ig fuse 15a
Engine control module (behind right side of dash)
G13
Gauge fuse 7.5a
Gnd
Heater fuse 15a
Hot at all times
Hot in on or start
I9 (in dash harness, behind left side of dash)
Idl
Idlo
Ie (behind left side of dash)
If (behind center of dash)
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
Junction connector 4 (behind left kick panel)
Junction connector 5 (behind upper left side of dash)
Junction connector 8 (behind right side of dash)
K12
K13
Od1
Park/neutral position switch (on transaxle)
Resume/ accel
Set/ coast
Spd
Stop fuse 20a
Stoplight switch
Stp

DEFOGGERS

Defoggers Wiring Diagram for Lexus RX 300 2003

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List of elements for Defoggers Wiring Diagram for Lexus RX 300 2003:

(behind center of dash) i6
(in body harness, in liftgate) b8
B11
Body ecu (behind left side of dash)
Dfg
Engine room j/b (on left
Fr def fuse 20a
Front window defogger
Fusible link block (in engine room j/b)
Heater fuse 15a
Hot at all times
Hot in on or start
I4 (in dash harness, behind left side of dash)
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
J/c 14 (in left side of liftgate)
J/c 5 (behind upper left side of dash)
J/c 9 (behind right kick panel)
Left remote control mirror
Mirror heater
Mirror heater relay (in r/b 1)
Noise filter (def) (in center of liftgate)
R21
R22
Rear window defogger
Right remote control mirror
Rr def fuse 30a
Rr def relay
Side of engine compartment)

ENGINE PERFORMANCE

3.0L

3.0L, Engine Performance Wiring Diagram (1 of 4) for Lexus RX 300 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (1 of 4) for Lexus RX 300 2003:

(dash harn, right side of dash) i11
(engine harn, e5 right side of engine)
(front side of engine) counter gear speed sensor
(left rear of engine) left camshaft timing oil control valve
(right rear of engine) right camshaft timing oil control valve
Aci1
Acis
Afl+
Afl-
Afr+
Afr-
Braided
Crankshaft position sensor (front side of engine)
Dsl
E01
E02
E03
E04
E05
E2g
E6 (engine harn, rear of engine)
Eb (at right of surge tank)
Ec (rear side of surge tank)
Electronically controlled transmission solenoid (in transaxle)
Engine control module (behind right side of dash)
Evp1
Fuel injectors
Hafl
Hafr
I11
Idle air control valve (on top right rear of engine)
Igf
Ignition coils & ignitors
Igt1
Igt2
Igt3
Igt4
Igt5
Igt6
J/c 10 (behind right side of dash)
Knkl
Knkr
Knock sensor 1 (top right side of engine)
Knock sensor 2 (top left side of engine)
Left vvt sensor (left rear of engine)
Mass airflow meter (near air cleaner housing, on air duct)
Nc+
Nc-
Ne+
Ne-
Noise filter (near air cleaner housing)
Oc1+
Oc1-
Oc2+
Oc2-
Power steering oil pressure switch (right rear of engine compt)
Red
Right vvt sensor (right rear of engine)
Rso
Sl1+
Sl1-
Sl2+
Sl2-
Tha
Tho
Thw
Vta1
Vv1+
Vv2+

3.0L, Engine Performance Wiring Diagram (2 of 4) for Lexus RX 300 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (2 of 4) for Lexus RX 300 2003:

(behind left side of dash) r/b 1
(dash harn, left side of dash)
(engine harn, rear of engine)
(in engine room j/b) r/b 2
A/f heater relay
A/f htr fuse 25a
Acc
Air fuel ratio sensor (bank 1, sensor 1) (right exhaust manifold)
Air fuel ratio sensor (bank 2, sensor 1) (left exhaust manifold)
Am2
Bi (above left rear axle housing)
Braided
Circuit opening relay
Ec (at rear of surge tank)
Efi fuse 20a
Efi relay
Engine room j/b (on left side of engine compt)
Fuel pump & sender (on top of fuel tank)
Heated oxygen sensor (bank 1, sensor 2) (in exhaust, rear of catalytic converter)
Hot at all times
Ig2
Ign fuse 7.5a
Ignition switch
Instrument panel j/b (behind left side of dash)
J/c 10 (behind right side of dash)
J/c 12 (in left side of luggage compt)
J/c 2 (in left front of engine compt, behind headlight)
J/c 3, j/c 4 (behind j3 left kick panel)
Lock
P/n
Park/neutral position switch (on transaxle)
Red
St2
Start
Starter fuse 7.5a

3.0L, Engine Performance Wiring Diagram (3 of 4) for Lexus RX 300 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (3 of 4) for Lexus RX 300 2003:

(dash harn, right side of dash)
(under left side of dash) data link connector 3
A10
Bat
C12
C14
Combination meter
Computer data lines system
E10
E11
Ec (at rear of surge tank)
Engine coolant temperature sensor (top front of engine)
Heater fuse 15a
Hot at all times
Hot in on or start
I11
I12
I6 (engine harn, rear of engine)
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
J/c 10 (behind right side of dash)
K12
K13
Malf ind lamp
Mpx1
Mpx2
O/d off ind
Obd fuse 7.5a
Ptnk
Sil
Spd
Stop fuse 20a
Stoplight switch
Tac
Tach
Throttle position sensor (on throttle body)
Vapor pressure sensor (under center rear of vehicle)
Vss
Vsv (acis 1) (on top center of engine)
Vsv (acis 2) (on top center of engine)
Vsv (acm) (on right front center of engine compt)
Vsv (canister closed valve) (left rear of engine compt)
Vsv (evap) (on top center of engine)
Vsv (pressure switching valve) (under center rear of vehicle)

3.0L, Engine Performance Wiring Diagram (4 of 4) for Lexus RX 300 2003

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List of elements for 3.0L, Engine Performance Wiring Diagram (4 of 4) for Lexus RX 300 2003:

(behind left side of dash) cruise control ecu
(behind upper center of dash) j/b 3
(behind upper left side of dash) j/c 7
(dash harn, center of dash) i6
(dash harn, right side of dash)
(on left front corner of engine) oil pressure switch
(on transaxle) turbine speed sensor
A/c system
A/t indicator switch (integral to park/neutral position switch) (on transaxle)
A39
A40
Abs & ba & trac & vsc ecu (behind right side a40 of dash)
Abs & ba & trac & vsc ecu (behind right side of dash)
Acm1
Acmg
Batt
Body ecu (behind left side of dash)
Ccv
Code
Computer data lines system
Cooling fans system
Ect
Efi+
Efi-
Electronically controlled transmission solenoid (in transaxle)
Eng+
Eng-
Engine control module (behind right side of dash)
Gauge fuse 7.5a
Generator
Hot in on or start
Hts
I11
Idl
Idlo
If (behind center of dash)
Igsw
Ih (right dash brace)
Imld
Instrument panel j/b (behind left side of dash)
J/c 8 (behind right side of dash)
Ksw
Lcki
Mops
Mpx1
Mpx2
Mrel
Neo
Nsw
Nt+
Nt-
O/d main switch
Od1
Odlp
Odms
Oxs
Pnk
Pre
Ptnk
Red
Rxck
Sil
Slt+
Slt-
Spd
Sta
Stp
Tach
Tbp
Transponder key amplifier (in steering column)
Trc+
Trc-
Txct
Unlock warning switch

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for Lexus RX 300 2003

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List of elements for Back-up Lamps Wiring Diagram for Lexus RX 300 2003:

Back-up light switch (integral to park/neutral position switch, on transaxle)
Gauge fuse 7.5a
Hot in on or start
Instrument panel j/b (behind left side of dash)
Junction connector 13 (in left side of liftgate)
Junction connector 14 (in left side of liftgate)
Junction connector 8 (behind right side of dash)
Left back-up light
Left rear combination light
Right back-up light
Right rear combination light

Exterior Lamps Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Exterior Lamps Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(above left rear axle housing) bi
(behind left side of dash) turn signal flasher
(in engine harness, at left front of engine compt) e12
(in engine harness, at right front of engine compt) e1
Body ecu (behind left side of dash)
Combination switch
E12
Ehw
Gauge fuse 7.5a
Gnd
Haz
Hazard switch
Head
Hot at all times
Hot in on or start
If (behind center of dash)
Illum
Instrument panel j/b (behind left side of dash)
Interior lights system
J/b 5 (behind upper left side of dash)
Junction connector 1 (in engine compartment, on right front fender)
Junction connector 11 (in left side luggage compartment)
Junction connector 12 (in left side of luggage compartment)
Junction connector 14 (in left side of liftgate)
Junction connector 2 (in left front of engine compartment, behind headlight)
Junction connector 7 (behind upper left side of dash)
Junction connector 9 (behind right kick panel)
Left
Left front side marker light
Left parking light
Left rear combination light
Left rear side marker light
Left rear turn signal light
Left stop light
Left tail- light
License plate light
Light control switch (part of combination switch)
Off
Right
Right front of engine compt)
Right front side marker light
Right parking light
Stpi
Tail
Tail fuse 10a
Taillight relay
Trly
Turn signal switch

Exterior Lamps Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Exterior Lamps Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(at right dash brace) ih
(behind combination meter) combination meter ecu
Bi (above left rear axle housing)
C10
C11
C12
C14
E10
E11
E12
Engine room j/b (on left side of engine compartment)
Gnd
Hazard fuse 15a
Heater fuse 15a
High mounted stop- light
Hot at all times
Hot in on or start
Hs-
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
Junction connector 1 (in engine compartment, on right front fender)
Junction connector 12 (in left side of luggage compartment)
Junction connector 13 (in left side of liftgate)
Junction connector 14 (in left side of liftgate)
Junction connector 15 (in left side of luggage compartment)
Junction connector 2 (in left front of engine compartment, behind headlight)
Junction connector 3 & 4 (behind left kick panel)
K13
L/s
Left front turn signal light
Left turn signal indicator light
Light failure sensor (in left side of luggage compt)
Lt/s
R/t
R10
Rear lights warning light
Red
Right front turn signal light
Right rear combination light
Right rear side marker light
Right rear turn signal light
Right stop light
Right tail- light
Right turn signal indicator light
Rt/s
Solid state
St +
St-
Stop fuse 20a
Stoplight switch
Towing fuse 20a
Trailer converter (forward of left taillight)
Trailer socket (below left side of rear bumper)

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 5) for Lexus RX 300 2003

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List of elements for Ground Distribution Wiring Diagram (1 of 5) for Lexus RX 300 2003:

(engine harness, near battery) e9
(engine harness, right front of engine compartment) e2
A/c dual pressure switch
A/c magnetic clutch & lock sensor
A/c single pressure switch
A/c triple pressure switch
A35
Abs & ba & trac & vsc ecu actuator
Contact
Data link connector (dlc) 3
E01
E02
E03
E04
E05
E11 (engine harness, left front of engine compartment)
E12 (engine harness, left front of engine compartment)
E4 (engine harness, top front of engine)
Eb (behind right of surge tank)
Ec (rear side of surge tank)
Engine control module
Engine room j/b (on left side of engine compartment)
Fan 2 relay
Headlight ecu
Heated oxygen sensor (bank 1 sensor 2)
I12 (dash harness, right side of dash)
Idle air control valve
Ignition coil & ignitor 1
Ignition coil & ignitor 2
Ignition coil & ignitor 3
Ignition coil & ignitor 4
Ignition coil & ignitor 5
Ignition coil & ignitor 6
Junction connector j/c 1 (in engine compartment, on right front fender)
Junction connector j/c 10 (behind right side of dash)
Junction connector j/c 2 (in left front of engine compartment, behind headlight)
Left front fog- light
Left front side marker light
Left front turn signal light
Left headlight (low beam)
Left headlight ecu
Left parking light
R/b 2
Radiator fan motor
Right front foglight
Right front turn signal light
Right headlight (low beam)
To engine room j/b (cavity f4) (diagram 4 of 5)
To j/c 1 (diagram 2 of 5)
W/ hid
W/o hid
Water temperature switch 1

Ground Distribution Wiring Diagram (2 of 5) for Lexus RX 300 2003

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List of elements for Ground Distribution Wiring Diagram (2 of 5) for Lexus RX 300 2003:

A w/o navigation
B w/ navigation
B12
Body ecu
C11
C14
C22
Cd automatic changer
Cigarette lighter
Combination meter ecu
Daytime running light resistor or short connector
Driver's seat heater switch
Drl 3 relay
Drl 4 relay
E10
E11
E3 (engine harness, right front of engine compartment)
Electronic controlled transmission pattern select switch
Engine hood courtesy switch
F10
F11
F13
From j/b 3 (diagram 2 of 5)
From j/c 1 (diagram 1 of 5)
Front passenger's seat heater switch
Fuel sender (sub)
Glove box light
Gnd
Gnd 1
Gnd 2
H10
Hazard switch
I16
I18
I7 (dash harness, right side of dash)
Ih (right dash brace)
Instrument control panel
Junction connector j/b 3 (behind upper center of dash)
Junction connector j/c 1 (in engine compartment, on right front fender)
Multi- display
O/d main switch
R/b 3 (on front center of engine compartment, on radiator support)
R28
Radio & player
Remote control mirror switch
Right front side marker light
Right parking light
Seat memory switch
Shift lock ecu
Theft deterrent indicator light
To j/b 3 (diagram 2 of 5)
To j/b 5 (cavity b10) (diagram 3 of 5)
Traction cut switch
Washer level warning switch

Ground Distribution Wiring Diagram (3 of 5) for Lexus RX 300 2003

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List of elements for Ground Distribution Wiring Diagram (3 of 5) for Lexus RX 300 2003:

(behind upper left end of dash)
A38
A39
A40
Abs & ba & trac & vsc ecu
Acc relay
B10
B11
B11 (body harness, in passenger's door)
Blower motor control relay
Brake fluid level switch
Center air bag sensor assembly
Combination switch
D14
Data link connector (dlc) 3
F15
From j/b 3 (cavity g9) (diagram 2 of 5)
Front passenger door ecu
Front wiper & washer switch (part of combination switch)
Front wiper motor
Gnd
Gnd1
Gnd2
Gnd3
Gnd4
Harness, center of dash) i6
Headlight beam level control ecu
Heater relay
I12 (dash harness, right side of dash)
If (top center of dash)
Instrument panel j/b (behind left side of dash)
Junction connector j/b 5 (behind upper left side of dash)
Junction connector j/c 7
Junction connector j/c 9 (behind right kick panel)
Key interlock solenoid
L10
Right remote control mirror heater
Steering angle sensor
To j/c 5 (cavity a) (diagram 4 of 5)
Transponder key amplifier
Turn signal flasher
Turn signal switch (part of combination switch)
Unlock warning switch

Ground Distribution Wiring Diagram (4 of 5) for Lexus RX 300 2003

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List of elements for Ground Distribution Wiring Diagram (4 of 5) for Lexus RX 300 2003:

(body harness, at headliner) b5
(dash harness, left side of dash) i3
(on left side of engine compartment) engine room j/b
(under right center pillar) bk
A/f heater relay
Auto antenna motor & relay
B2 (body harness, in driver's door)
B4 (body harness, at headliner)
B5 (body harness, at headliner)
B6 (body harness, at headliner)
B9 (body harness, in right rear door)
Body ecu
Coil
Contact
Cruise control actuator
Cruise control ecu
Cruise control switch (part of combination switch)
D17
Driver door ecu
Ecc
Efi relay
From ground g206 (diagram 3 of 5)
From j/c 2 (cavity a) (diagram 1 of 5)
Front passenger's power seat control switch
Front passenger's seat heater
Front window defogger
Gnd
Gnd1
Heater element
I6 (dash harness, center of dash)
Inner mirror & compass
Junction connector j/c 15 (under right rear seat)
Junction connector j/c 18 (under passenger's seat)
Junction connector j/c 5 (behind upper left side of dash)
Left remote control mirror
Left vanity light & garage door opener
Moon roof control ecu
Moon roof control switch
Personal light
R/b 2
R13
Right buckle switch
Right rear combination light
Right rear door ecu
Right rear side marker light
Right rear turn signal light
Right stop light
Right taillight
Right vanity light
Rr def relay
S14
Sel1
Starter relay
Stereo component amplifier
T15
Telephone ecu
W/moon roof
W/o moon roof

Ground Distribution Wiring Diagram (5 of 5) for Lexus RX 300 2003

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List of elements for Ground Distribution Wiring Diagram (5 of 5) for Lexus RX 300 2003:

Back door courtesy switch
Back door key & unlock switch
Back door unlock detection switch & back door lock motor
Bi (upper left side of rear axle housing)
Bj (under left center pillar)
Bl (left rear quarter panel)
Driver's seat heater
Driver's seat power seat control switch
Front power outlet
Front vertical position control sensor
Fuel pump & (fuel sender main)
Gnd
High mounted stoplight
Junction connector j/c 12 (in left side of luggage compt)
Junction connector j/c 14 (in left side of liftgate)
Junction connector j/c 16 (under driver's seat)
Junction connector j/c 17 (under driver's seat)
Left back-up light
Left buckle switch
Left failure sensor
Left rear combination light
Left rear door ecu
Left rear side marker light
Left rear turn signal light
Left stop light
Left stop- light
Left taillight
License plate light
Navigation ecu
P18
P19
Power seat control switch (driver's seat lumbar support control)
Power seat control switch (passenger's seat)
Power seat ecu
R11
Rear power outlet
Rear vertical position control sensor
Rear window defogger
Rear wiper motor
Reclining position control sensor
Right back-up light
Right rear combination light
Right stop light
Right taillight
Sgnd
Slide position control sensor
Trailer converter
Trailer socket
W/driving position memory
W/o driving position memory
Wireless door lock ecu

HEADLIGHTS

Headlamps Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Headlamps Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(behind center of dash) if
(in dash harness, behind left side of dash) i5
Auto
Automatic light control sensor (behind upper left side of dash)
Bdr
Becu
Body ecu (behind left side of dash)
C14
Cltb
Clte
Clts
Combination meter ecu
Combination switch
Cpub
Cty
Ctye
D17
Dimmer switch
Dome fuse 10a
Driver door ecu (in left front door)
Drl
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Ffgo
Ffog
Fl door fuse 20a
Flash
Foglight switch
G10
Gnd
H-lp left lwr fuse 15a
H-lp right lwr fuse 15a
Head
Headlamp relay
High
Hot at all times
Hrly
I16 (w/o nav)
I18 (w/ nav)
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
Junction connector 1 (in engine compartment, on right front fender)
Junction connector 2 (in left front of engine compartment, behind headlight)
Junction connector 5 (behind upper left side of dash)
Junction connector 7 (behind upper left side of dash)
Junction connector 9 (behind right kick panel)
Ksw
Left front door courtesy switch
Left low beam headlight
Light control switch
Low
Main fuse 50a
Mpx+
Mpx-
Mpx1
Mpx2
Off
Pkb
Pnk
Red
Red w/o hid
Right low beam headlight
Tail
Trly
Unlock warning switch
W/ hid

Headlamps Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Headlamps Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(in engine harness, at left side of engine) e7
(in engine harness, at left side of engine) e8
(near battery) e9
A10
C14
Canadian models
Combination meter ecu
Daytime running light resistor (on left front of engine compartment)
Drl 2 relay
Drl 3 relay
Drl 4 relay
Drl fuse 7.5a
E14 (in engine harness, at right fender)
Engine room j/b (on left side of engine compartment)
Fog- light relay
Fr fog fuse 15a
Gauge fuse 7.5a
H-lp left upr fuse 15a
H-lp right upr fuse 15a
Head indicator
High beam indicator
Hot at all times
Hot in on or start
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
Junction connector (behind left kick panel)
Junction connector 1 (in engine compartment, on right front fender)
Junction connector 2 (in left front of engine compt, behind headlight)
K10
Left front fog- light
Left headlight ecu (w/ hid) (behind left headlight)
Left high beam headlight (w/o hid)
Parking brake switch
R/b 2
R/b 3 (on front center of engine compt, on radiator support)
Red
Right front fog- light
Right headlight ecu (w/ hid) (behind right headlight)
Right high beam headlight (w/o hid)
Short connector (on left front of engine compartment)
Solid state
Tail fuse 10a
Taillight relay
Us models
W/ hid
W/o hid

Headlamps Leveling Wiring Diagram for Lexus RX 300 2003

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List of elements for Headlamps Leveling Wiring Diagram for Lexus RX 300 2003:

A37
A40
Abs & ba & trac & vsc ecu (behind right side of dash)
C13
C14
Chg-
Combination meter ecu
Ecu-ig fuse 15a
Engine room j/b (on left side of engine compt)
G13
Generator
Head lamp relay
Headlight beam level cntrl warning light
Headlight beam level control ecu (behind left end of dash)
Heater fuse 15a
Height control sensor (under rear of vehicle)
Hot at all times
Hot in on or start
I12
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
Junction connector 4 (behind left kick panel)
Junction connector 9 (behind right kick panel)
K13
Left headlight beam level control actuator
Lh+
Lh-
Lhe
Lhg
Lht
Main fuse 50a
Pnk
Red
Rh+
Rh-
Rhe
Rhg
Rht
Right headlight beam level control actuator
Sbr
Sgr
Shr2
Spdl
Spdn
W/ hid
W/o hid
Wng

HORN

Horn Wiring Diagram for Lexus RX 300 2003

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List of elements for Horn Wiring Diagram for Lexus RX 300 2003:

(on left side of engine compartment)
Body ecu (behind left side of dash)
Combination switch
Engine room j/b
Horn
Horn fuse 10a
Horn relay
Horn switch
Hot at all times
I4 (in dash harness, behind left side of dash)
Left horn
Right horn

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(at right dash brace) ih
2 indicator
A/t oil temp indicator
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
Anti-lock brakes system
B10
B11
B12
B13
B14
B15
B16
C/c
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
Combination meter ecu (behind combination meter)
Cruise control ecu (behind left side of dash)
Cruise control, engine controls, navigation systems
D indicator
Data link connector 3 (under left side of dash)
Driver door ecu (in left front door)
E10
Ect snow indicator
Engine control module (behind right side of dash)
Engine controls system
Exterior lights system
Fuel gauge
Fuel indicator
Fuel pump & fuel sender (main) (on top of fuel tank)
Fuel sender (sub) (under center of vehicle)
Headlights system
Heater fuse 15a
Hot in on or start
I16
I18
I9 (in dash harness, behind left side of dash)
Instrument control panel
Instrument panel j/b (behind left side of dash)
Interior lights system
J/b 3 (behind upper center of dash)
K13
L indicator
Left turn indicator
Light failure sensor (in left side of luggage compartment)
Mpx-
Mpx1
N indicator
Odlp
Odns
Oil indicator
P indicator
Pnk
R indicator
Rear lights indicator
Red
Right turn indicator
Seat belt indicator
Solid state
Speedometer
Tachometer
To combination meter ecu (diagram 2 of 2)
W/o navi w/ navi
Water temp gauge
Wiper/washer system

Instrument Cluster Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(2wd)
A15
A16
A17
A18
A19
A20
A21
A22
Abs indicator
Auto leveling indicator
B10
B14
Brake indicator
Buzzer
C10
C12
C14
C15
C17
C18
C19
C20
C21
Charge indicator
Combination meter ecu (behind combination meter)
Cruise indicator
Dome fuse 10a
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
From combination meter ecu (diagram 1 of 2)
G10
H-lp r lwr fuse 15a
Head indicator
High beam indicator
Hot at all times
Hot w/ head lamp relay energized
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
Junction connector 4 (behind left kick panel)
Malfunction indicator lamp
O/d main switch
O/d off indicator
Odo/trip
Open door indicator
Red
Rheostat
Slip indicator
Solid state
Srs indicator
Tail cancel
Tail indicator
Trac off indicator
Vsc indicator
Washer ind

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Courtesy Lamps Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(at left rear quarterpanel) bl
A10
B11
Bcty
Bdr
Becu
Bj (at bottom of left ``b" pillar)
Body ecu (behind left side of dash)
Bsub
C14
Code
Combination meter ecu
Cpub
Cty
Ctyb
Ctye
Cyl
D rr door fuse 20a
D12
Driver door ecu (in left front door)
Engine control module (behind right side of dash)
F11
F13
Front passenger door ecu (in right front door)
Gauge fuse 7.5a
Gnd
Gnd1
Gnd2
Hot at all times
Hot in on or start
I16
I18
I5 (in dash harness, behind left side of dash)
Ih (at right dash brace)
Ile
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind left kick panel)
J/b 3 (behind upper center of dash)
J/c 3 & 4 (behind left kick panel)
J/c 5 (behind upper left side of dash)
J/c 9 (behind right kick panel)
K10
Left front door courtesy light
Left front door courtesy switch
Left rear door courtesy switch
Left rear door ecu (in left rear door)
Mpx+
Mpx-
Mpx1
Mpx2
Open door indicator
P fr door fuse 20a
P rr door fuse 20a
Rco
Rda
Red
Right front door courtesy light
Rssi
Sig
Solid state
Vcc
W/ navigation
W/o navigation
Wireless door lock ecu (in center of vehicle)

Courtesy Lamps Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Courtesy Lamps Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(in body harness, at headliner) b3
(in body harness, at headliner) b6
(w/o moon roof) (w/moon roof)
B4 b5
Back door courtesy switch
Bdr
Bk (at bottom of right ``b" pillar)
Cpub
Cty
Ctye
Diode (rear interior light) (in rear center of roof)
Dome fuse 10a
Door
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Fl door fuse 20a
Front interior light
G10
Garage door opener
Gnd
Hot at all times
Ignition key cylinder light
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
J/c 14 (in left side of liftgate)
J/c 3 & 4 (behind left kick panel)
J/c 5 (behind upper left side of dash)
Left vanity light
Mpx1
Mpx2
Off
Personal light
Rear interior light
Red
Right rear door courtesy switch
Right rear door ecu (in right rear door)
Right vanity light
Sel1
Sig

Instrument Illumination Wiring Diagram for Lexus RX 300 2003

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List of elements for Instrument Illumination Wiring Diagram for Lexus RX 300 2003:

(w/ navigation)
(w/o navigation)
A12
Ashtray illumination
Body ecu (behind left side of dash)
C13
C14
Cigarette lighter illumination
Combination meter ecu
Driver seat heater switch
E10
Electronically controlled transmission pattern select switch illumination
Front
Glove box light
H10
Hazard switch
Head
Hot at all times
I16
I18
Ih (at right dash brace)
Ill+
Ill-
Instrument control panel illumination
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/c 9 (behind right kick panel)
Light control switch (combination switch)
O/d main switch illumination
Off
Panel fuse 7.5a
Passenger's
R28
Radio & player (w/ navigation)
Rheostat
Seat heater switch
Tail
Tail cancel
Taillight relay
Traction cut switch illumination (2wd)
Trly

MEMORY SYSTEMS

Memory Systems Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Memory Systems Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(at right dash brace) ih
Computer data lines system
D13
Dome fuse 10a
Ecu-ig fuse 15a
Engine room j/b (on left side of engine compartment)
Fdwn
Front
Front passenger's seat power seat control switch
Frv+
Frv-
Fup
G11
G13
Gnd
Hot at all times
Hot in on or start
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/c 18 (under passenger's seat)
Junction connector 15 (in left side of luggage compt)
Junction connector 17 (under driver's seat)
Junction connector 18 (under passenger's seat)
Junction connector 3 & 4 (behind left kick panel)
Ldwn
Lft+
Lft-
Lup
Mmry
Mpx1
P18
P19
Pnk
Power fuse 30a
Power seat ecu (under driver's seat)
Power seat motor (driver's seat front vertical control)
Power seat motor (driver's seat rear vertical control)
Power seat motor (driver's seat reclining control)
Power seat motor (driver's seat slide control)
Power seat motor (front passenger's seat reclining control)
Power seat motor (front passenger's seat slide control)
Pvcc
Rcl+
Rcl-
Rclf
Rclr
Rear
Reclining
Red
Seat memory switch
Set
Sgnd
Sld+
Sld-
Sldf
Sldr
Slide
Ssfv
Ssrl
Ssrr
Ssrs
Sw1
Sw2
Sysb

Memory Systems Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Memory Systems Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(above left rear axle housing) bi
(at bottom of left "b" pillar) bj
Down
Driver's seat power seat control switch
Front
Front vertical
Front vertical position control sensor
Junction connector 12 (in left side of luggage compt)
Junction connector 16 (under driver's seat)
Junction connector 17 (under driver's seat)
Power seat control switch (driver's seat lumbar support control)
Power seat motor (driver's seat lumbar support control)
Rear
Rear vertical
Rear vertical position control sensor
Reclining
Reclining position control sensor
Slide
Slide position control sensor

NAVIGATION

Navigation Wiring Diagram for Lexus RX 300 2003

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List of elements for Navigation Wiring Diagram for Lexus RX 300 2003:

(benind left kick panel)
+b1
A j3
A10
A12
A13
Acc
Bi (above left rear axle housing)
C j4
C14
C18
Combination meter
Computer data lines system
Cruise control ecu (behind left side of dash)
Dome fuse 10a
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compt)
Exterior lights system
F13
Gauge fuse 7.5a
Gnd1
Hot at all times
Hot in acc or on
Hot in on or start
Hot w/ taillight relay energized
I18
Ih (at right dash brace)
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
J/c 3 & 4
Junction connector 12 (in left side of luggage compartment)
K12
Multi-display
Navigation ecu (on right rear of cargo area)
Nca
Panel fuse 7.5a
Parking brake switch
Pkb
Pnk
Radio 2 fuse 7.5a
Red
Sound systems
Spd
Sync
Tail
Tx+
Tx-
Tx1+
Tx1-
Tx3+
Tx3-

PASSIVE RESTRAINTS

Passive Restraints Wiring Diagram for Lexus RX 300 2003

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List of elements for Passive Restraints Wiring Diagram for Lexus RX 300 2003:

(behind left kick panel)
Bj (at bottom of left "b" pillar)
Gauge fuse 7.5a
Hot in run or start
Instrument panel j/b (behind left side of dash)
J/c 15 (in left side of luggage compartment)
J/c 17 (under driver's seat)
J/c 18 (under passenger's seat)
J/c 3 & 4
Left buckle switch (on left seat belt buckle)
Left tension reducer solenoid (at base of left "b" pillar)
Right buckle switch (on right seat belt buckle)
Right tension reducer solenoid (at base of right "b" pillar)

POWER ANTENNA

Power Antenna Wiring Diagram for Lexus RX 300 2003

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List of elements for Power Antenna Wiring Diagram for Lexus RX 300 2003:

(behind left side of dash)
(in body harness, under right rear seat) b7
(on left side of engine compt)
(w/navigation)
(w/o navigation)
A13
Acc
Ant
Auto antenna motor & relay (in right side of luggage compt)
Bm (under rear right seat)
Ecu-ig fuse 15a
Engine room j/b
Hot at all times
Hot in acc or on
Hot in on or start
Instrument panel j/b (behind left side of dash)
Instrument panel j/b
J/b 3 (behind upper center of dash)
J/c 15
R28
Rad 1 fuse 25a
Radio & player
Radio 2 fuse 7.5a
Stereo component amplifier (under rear seat)

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 4) for Lexus RX 300 2003

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List of elements for Power Distribution Wiring Diagram (1 of 4) for Lexus RX 300 2003:

(exterior lights system)
Abs fuse 60a
Air conditioning system
Air conditioning system & cooling fans system
Alt fuse 140a
Am1 fuse 40a
Anti-lock brakes system
Anti-lock brakes system, body computer system, cruise control system, engine controls system, exterior lights system, shift interlock system & transmissions system
Anti-theft system, body computer system, door locks system, interior lights system & power windows system
Battery
Cds fuse 40a
Coil
Computer data lines system
Contact
D rr door fuse 20a
D12
D13
Defogger system
E10
Engine room j/b (on left side of engine compartment)
Exterior lights system
Foglight relay
Fr def fuse 20a
Fr fog fuse 15a
From s/roof fuse a (diagram 1 of 4)
Fusible link block
G11
Generator
Heater fuse 50a
Instrument panel j/b (behind left side of dash)
Interior lights system & navigation system
Obd fuse 7.5a
P fr door fuse 20a
P rr door fuse 20a
Panel fuse 7.5a
Power fuse 30a
Power tops system
Rdi fuse 40a
Rr def fuse 30a
S/roof fuse 20a
Seat htr fuse 15a
Seats system
Seats system & memory system
Starter
Stop fuse 20a
Tail fuse 10a
Taillight relay
To engine room j/b (r/b 2, a/f htr fuse, 25a) (diagram 2 of 4)
To engine room j/b cavity i1 (diagram 2 of 4)
To ignition switch (cavity 2) (diagram 3 of 4)
To power fuse (diagram 1 of 4)
To pwr outlet fuse (diagram 4 of 4)

Power Distribution Wiring Diagram (2 of 4) for Lexus RX 300 2003

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List of elements for Power Distribution Wiring Diagram (2 of 4) for Lexus RX 300 2003:

(4 or 5)
(engine harness, red near battery) e9
(headlights system)
A/f htr fuse 25a
Air conditioning system, anti-theft system, body computer system, door locks system, headlights system, instrument cluster system, interior lights system, power windows system & warning systems
Air conditioning system, garage door opener, instrument cluster system, interior lights system, memory systems, navigation system, body computer system, power tops system & sound systems
Alt-s fuse 7.5a
Am2 fuse 20a
Anti-theft system, body computer system, door locks system, headlights system, interior lights system, power windows system & warning system
Cellular phones system
Coil
Contact
Dome fuse 10a
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 compartment)
Exterior lights system
Fl door fuse 20a
From fusible link block (cavity 1) (diagram 1 of 4)
From fusible link block (cavity 3) (diagram 1 of 4)
From main fuse f (diagram 2 of 4)
G12
H-lp l lwr fuse 15a
H-lp l upr fuse 15a
H-lp r lwr fuse 15a
H-lp r upr fuse 15a
Hazard fuse 15a
Headlamp relay
Headlights system
Headlights system & instrument cluster system
Horn fuse 10a
Horn relay
Instrument panel j/b (behind left side of dash)
Main fuse 50a
Power antenna system & sound systems
R/b 2
R/b 3 (on front center of engine compartment, on radiator support)
Rad 1 fuse 25a
Red
Short pin
Starter relay
Starting/ charging system
Tel fuse 15a
To ignition switch (cavity 7) (diagram 3 of 4)
To short pin (diagram 2 of 4)
Towing fuse 20a

Power Distribution Wiring Diagram (3 of 4) for Lexus RX 300 2003

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List of elements for Power Distribution Wiring Diagram (3 of 4) for Lexus RX 300 2003:

Acc
Air conditioning system, anti-theft system, body computer system, door locks system, headlights system, interior lights system, power windows system & warning systems
Air conditioning system, cooling fans system & defogger system
Air conditioning, anti-lock brake, body computer, cruise control, engine control, exterior light, headlight, instrument cluster, starting/charging, srs, transmission & warning systems
Am1
Am2
Anti-lock brakes system
Body computer system & wiper/washer system
Cellular phones system & power antenna system
Cruise control system, exterior lights system, navigation system & transmissions system
Cruise control system, headlights system, memory system, mirrors system & power windows system
D10
Door locks system, anti-theft system, body computer system, interior lights system & power windows system
Door locks system, anti-theft system, body computer system, interior lights system, power windows system & warning systems
Door locks system, exterior lights system, interior lights system, anti-theft system, body computer system, passive restraints system & power windows system
Door locks system, interior lights system, anti-theft system, body computer system, passive restraints system & power windows system
Ecu-ig fuse 15a
Engine controls system
Engine controls system & starting/charging system
Engine controls system & transmissions system
Exterior lights system
From instrument panel j/b (am1 fuse, 40a) (cavity c6) (diagram 1 of 4)
From instrument panel j/b (cavity c3) (diagram 2 of 4)
From wiper fuse h (diagram 3 of 4)
G13
Gauge fuse 7.5a
Heater fuse 15a
Ig1
Ig2
Ign fuse 7.5a
Ignition switch
Instrument panel j/b (behind left side of dash)
K10
K13
Lock
Navigation system
Pnk
Red
Rr wip fuse 15a
Seats system
Shift interlock system
Srs-ig fuse 15a
St2
Start
Starter fuse 7.5a
Starting/ charging system
To gauge fuse (diagram 3 of 4)
To instrument panel j/b (cavity c2) (diagram 4 of 4)
Washer fuse 20a
Wiper fuse 25a
Wiper/washer system

Power Distribution Wiring Diagram (4 of 4) for Lexus RX 300 2003

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List of elements for Power Distribution Wiring Diagram (4 of 4) for Lexus RX 300 2003:

(right instrument panel brace) ih
(upper left side of rear axle housing) bi
Acc relay
Air conditioning system, navigation system, power antenna system & sound systems
Body computer system & warning systems
Cellular telephone system, navigation system, power antenna system & sound system
Cig fuse 15a
Cigarette lighter
D14
From ignition switch (cavity 3) (diagram 3 of 4)
From taillight relay (diagram 1 of 4)
Front power outlet (rear of center console)
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/c 12 (in left side of luggage compartment)
J/c 9 (right end of dash)
Junction connector (left kick panel)
Mirrors system
Pnk
Pwr outlet fuse 15a
Radio 2 fuse 7.5a
Rear power outlet (left rear side of cargo area)
Shift interlock system

POWER DOOR LOCKS

Power Door Locks Wiring Diagram (1 of 2) for Lexus RX 300 2003

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List of elements for Power Door Locks Wiring Diagram (1 of 2) for Lexus RX 300 2003:

(at right dash brace) ih
(behind lef side of dash) body ecu
(behind upper center of dash) j/b 3
A10
Back door courtesy switch
Back door key lock & unlock switch
Back door motor assembly
Back door unlock detection switch
Bcty
Bdr
Bdsl
Bdsu
Becu
Bn (at center of rear panel)
Bsub
Bzr
Bzr2
C14
Combination meter ecu (behind combination meter)
Cpub
Cty
Ctye
D rr door fuse 20a
D12
Door key lock & unlock switch
Door lock control switch
Door lock m
Door lock motor
Door unlock detection switch
Driver door ecu (in left front door)
F11
F13
G10
Gauge fuse 7.5a
Gnd
Gnd1
Gnd2
Hot at all times
Hot in on or start
I16
I18
I5 (in dash harness, behind left side of dash)
Ie (behind left side of dash)
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J3 d
Junction connector 14 (in left side of liftgate)
Junction connector 3 & 4 (behind left kick panel)
Junction connector 5 (behind upper left side of dash)
K10
Ksw
Kul
Left front door courtesy switch
Left front door lock assembly
Lock
Lsw
Lswa
Lswe
Motor
Mpx+
Mpx-
Mpx1
Mpx2
P fr door fuse 20a
P rr door fuse 20a
Pnk
Rco
Rda
Rdr+
Rdr-
Rssi
Sig
Solid state
Un- lock
Unlock
W/ navigation
W/o navigation
Wireless door lock buzzer (w/ keyless entry) (in left front corner of engine compt) engine control module (behind right side of dash)

Power Door Locks Wiring Diagram (2 of 2) for Lexus RX 300 2003

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List of elements for Power Door Locks Wiring Diagram (2 of 2) for Lexus RX 300 2003:

(at bottom of left "b" pillar) bj
(behind center of dash) if
(in center of vehicle)
B11
Bdr
Bk (at bottom of right "b" pillar)
Bl (at left rear quarterpanel)
Code
Cpub
Cty
Ctye
Door key lock & unlock switch
Door lock control switch
Door lock motor
Door unlock detection switch
Ecu-b fuse 7.5a
Engine room j/b (on left side of engine compartment)
Fl door fuse 20a
Front passenger door ecu (in right front door)
Gnd
Hot at all times
Ig (behind right side of dash)
Junction connector 7 (behind upper left side of dash)
Junction connector 9 (behind right kick panel)
Kul
Left rear door courtesy switch
Left rear door ecu (in left rear door)
Left rear door lock assembly
Left rear door unlock detection switch
Lock
Lsw
Lswe
Mpx1
Mpx2
Pnk
Right front door courtesy switch
Right front door lock assembly
Right rear door courtesy switch
Right rear door ecu (in right rear door)
Right rear door lock assembly
Right rear door unlock detection switch
Sel1
Sig
Unlock
Unlock warning switch
Vcc
Wireless door lock ecu (w/ keyless entry)

POWER MIRRORS

Electrochromic Mirror Wiring Diagram for Lexus RX 300 2003

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List of elements for Electrochromic Mirror Wiring Diagram for Lexus RX 300 2003:

(behind left side of dash)
(in dash harness, at left kick panel)
(w/o moon roof) b4 b5 (w/ moon roof)
Ec+
Ec-
Ecu-ig fuse 15a
G13
Gnd
Hot in on or start
Inner mirror & compass
Instrument panel j/b
J/c 4 (behind left kick panel)
J/c 5 (behind upper left side of dash)
Left remote control mirror
Right remote control mirror

Power Mirrors Wiring Diagram for Lexus RX 300 2003

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List of elements for Power Mirrors Wiring Diagram for Lexus RX 300 2003:

Cig fuse 15a
Defogger system
Down
Electrochromic mirror circuit
Hot in acc or on
I2 (in dash harness, at left side of dash)
Ih (at right dash brace)
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
K4 pnk
Left
Left remote control mirror
Operation switch
Pnk
Remote control mirror switch
Right
Right remote control mirror
Select switch

POWER SEATS

Heated Seats Wiring Diagram for Lexus RX 300 2003

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List of elements for Heated Seats Wiring Diagram for Lexus RX 300 2003:

B11
Bj (at bottom of left "b" pillar)
Driver's seat heater
Driver's seat heater switch
Front passenger's seat heater
Front passenger's seat heater switch
Gauge fuse 7.5a
Hot at all times
Hot in on or start
I6 (in dash harness, behind center of dash)
If (behind center of dash)
Ih (at right dash brace)
Instrument panel j/b (behind left side of dash)
Interior lights system
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
Junction connector 15 (in left side of luggage compartment)
Junction connector 17 (under driver's seat)
Junction connector 18 (under passenger's seat)
Red
Seat heater relay (behind right side of dash, near engine control module)
Seat htr fuse 15a

Power Seats Wiring Diagram for Lexus RX 300 2003

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List of elements for Power Seats Wiring Diagram for Lexus RX 300 2003:

Bj (at bottom of left "b" pillar)
D13
Down
Driver's power seat control switch
Front
Front passenger's power seat control switch
Front vertical
G11
Hot at all times
Instrument panel j/b (behind left side of dash)
Junction connector 15 (in left side of luggage compartment)
Junction connector 17 (under driver's seat)
Junction connector 18 (under passenger's seat)
Power fuse 30a
Power seat control switch (driver's seat lumbar support control)
Power seat motor (driver's seat front vertical control)
Power seat motor (driver's seat lumbar support control)
Power seat motor (driver's seat rear vertical control)
Power seat motor (driver's seat reclining control)
Power seat motor (driver's seat slide control)
Power seat motor (front passenger's seat reclining control)
Power seat motor (front passenger's seat slide control)
Rear
Rear vertical
Reclining
Slide

POWER TOP/SUNROOF

Power Top/Sunroof Wiring Diagram for Lexus RX 300 2003

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List of elements for Power Top/Sunroof Wiring Diagram for Lexus RX 300 2003:

Body ecu (behind left side of dash)
Dome fuse 10a
Ecu-ig fuse 15a
Engine room j/b (on left side of engine compartment)
G13
Hot at all times
Hot in on or start
Instrument panel j/b (behind left side of dash)
J/b 5 (behind upper left side of dash)
Junction connector 4 (behind left kick panel)
Junction connector 5 (behind upper left side of dash)
Limit switch
Ls 1
Ls 2
Moon roof control ecu (on front center of moon roof)
Moon roof control switch
Moon roof motor
Mpx1
Pnk
Red
S/roof fuse 20a
Slide close/ tilt up
Slide open/ tilt down
Solid state

POWER WINDOWS

Power Windows Wiring Diagram (1 of 3) for Lexus RX 300 2003

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List of elements for Power Windows Wiring Diagram (1 of 3) for Lexus RX 300 2003:

(at left rear quarterpanel) bl
A10
Auto
Bdr
Becu
Body ecu (behind left side of dash)
Bsub
C14
Code
Combination meter ecu (behind combination meter)
Cpub
Cty
Ctye
D rr door fuse 20a
D12
Down
Driver door ecu (in left front door)
F11
F13
G10
Gauge fuse 7.5a
Gnd
Gnd1
Gnd2
Hot at all times
Hot in on or start
I16
I18
I5 (in dash harness, behind left side of dash)
Ie (at left kick panel)
Ih (at right dash brace)
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/c 5 (behind upper left side of dash)
Junction connector 3, junction connector 4 (behind left kick panel)
K10
Ksw
Kul
Left front door courtesy switch
Left front door key lock & unlock switch
Left front power window motor
Left rear switch
Limit switch
Lmt
Lock
Lswe
Mpx+
Mpx-
Mpx1
Mpx2
P fr door fuse 20a
P rr door fuse 20a
Pls
Pnk
Pulse sensor
Rco
Rda
Red
Right front switch
Right rear switch
Rssi
Sgnd
Sig
Unlock
Vcc
W/ navigation w/o navigation
W/l2
Window lock switch
Wireless door lock ecu (w/ keyless entry) (in center of vehicle)

Power Windows Wiring Diagram (2 of 3) for Lexus RX 300 2003

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List of elements for Power Windows Wiring Diagram (2 of 3) for Lexus RX 300 2003:

Auto
Bdr
Bj (at bottom of left "b" pillar)
Cpub
Cty
Ctye
Down
Ecu-b fuse 7.5a
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compartment)
Fl door fuse 20a
Front passenger door ecu (in right front door)
Gnd
Hot at all times
If (behind center of dash)
Ig (at right kick panel)
J/b 5 (behind upper left side of dash)
Junction connector 7 (behid upper left side of dash)
Junction connector 9 (behind right kick panel)
Left rear door ecu (in left rear door)
Left rear power window motor
Limit switch
Lmt
Mdn
Mpx1
Mpx2
Mup
Pct
Pcti
Pcto
Pls
Power window control switch
Pulse sensor
Pwe
R11
R12
Red
Right front door courtesy switch
Right front power window motor
Sgnd
Sig
Unlock warning switch

Power Windows Wiring Diagram (3 of 3) for Lexus RX 300 2003

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List of elements for Power Windows Wiring Diagram (3 of 3) for Lexus RX 300 2003:

(at bottom of right "b" pillar) bk
Auto
Auto down
Auto up
Bdr
Cpub
Cty
Ctye
Gnd
Left rear door courtesy switch
Left rear power window control switch
Lmt
Manual down
Manual up
Mdn
Mpx1
Mpx2
Mup
Pcti
Pcto
Pls
Pwe
R13
R14
Red
Right rear door courtesy switch
Right rear door ecu (in right rear door)
Right rear power window control switch
Right rear power window motor
Sel1
Sgnd
Sig

RADIO

Radio Wiring Diagram, with Navigation for Lexus RX 300 2003

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List of elements for Radio Wiring Diagram, with Navigation for Lexus RX 300 2003:

A13
Acc
Ant
Cd automatic changer
Cdl+
Cdl-
Cdr+
Cdr-
D11
Dome fuse 10a
Ejct
Eject
Emut
Engine room j/b (on left side of engine compartment)
Fl+
Fl-
Fr+
Fr-
Gnd
Hot at all times
Hot in acc or on
I18
Ih (at right dash brace)
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
J/c 15 (in left side of luggage compartment)
J/c 4 (behind left kick panel)
Left front door speaker
Left rear door speaker
Left tweeter
Multi-display
Mute
Navigation ecu (on right rear of cargo area)
Nca
Pnk
Power antenna system
R28
R29
Rad 1 fuse 25a
Radio & player
Radio 2 fuse 7.5a
Red
Red c
Right front door speaker
Right rear door speaker
Right tweeter
Rl+
Rl-
Rr+
Rr-
S14
S15
S16
Sgd2
Sgnd
Stereo component amplifier (under rear seat)
T15
T16
T18
Telephone ecu (on right rear of cargo area)
Tmut
Tx+
Tx-
Tx1+
Tx1-
Tx3+
Tx3-
Wf+
Wf-
Wfr+
Wfr-
Woofer speaker

Radio Wiring Diagram, without Navigation for Lexus RX 300 2003

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List of elements for Radio Wiring Diagram, without Navigation for Lexus RX 300 2003:

A13
Acc
Ant
Cd automatic changer
Cdl+
Cdl-
Cdr+
Cdr-
D11
Dome fuse 10a
Ejct
Eject
Emut
Engine room j/b (on left side of engine compartment)
Fl+
Fl-
Fr+
Fr-
Gnd
Hot at all times
Hot in acc or on
I16
Ih (at right dash brace)
Instrument control panel
Instrument panel j/b (behind left side of dash)
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
J/c 15 (in left side of luggage compartment)
J/c 4 (behind left kick panel)
Left front door speaker
Left rear door speaker
Left tweeter
Multi-display
Mute
Nca
Pnk
Power antenna system
Rad 1 fuse 25a
Radio & player
Radio 2 fuse 7.5a
Red
Right front door speaker
Right rear door speaker
Right tweeter
Rl+
Rl-
Rr+
Rr-
S14
S15
S16
Sgd2
Sgnd
Stereo component amplifier (under rear seat)
T15
T16
T18
Telephone ecu (on right rear of cargo area)
Tmut
Tx+
Tx-
Tx1+
Tx1-
Wf+
Wf-
Wfr+
Wfr-
Woofer speaker

SHIFT INTERLOCK

Shift Interlock Wiring Diagram for Lexus RX 300 2003

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List of elements for Shift Interlock Wiring Diagram for Lexus RX 300 2003:

15a
20a
Acc
Cig fuse
E11
Ecu-ig fuse
Hot at all times
Hot in acc or on
Hot in on or start
If (behind center of dash)
Ih (at right dash brace)
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
J/b 5 (behind upper left side of dash)
J/c 7 (behind upper left side of dash)
Key interlock solenoid
Kls+
Nca
Pnk
Shift lock control switch
Shift lock ecu (under center console, beside shift lever)
Shift lock solenoid
Sls+
Sls-
Stop fuse
Stoplight switch
Stp

STARTING/CHARGING

Charging Wiring Diagram for Lexus RX 300 2003

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List of elements for Charging Wiring Diagram for Lexus RX 300 2003:

Alt fusible link 140a
Alt-s fuse 7.5a
Battery
Battery ground
Body ecu (behind left side of dash)
C14
Charge indicator
Combination meter ecu
Ecu-ig fuse 15a
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compartment)
Fusible link block (in engine room j/b)
Generator
Heater fuse 15a
Hot at all times
Hot in on or start
I16
I18
Instrument control panel
Instrument panel j/b (behind left side of dash)
J/b 3 (behind upper center of dash)
K13
Mpx+
Mpx-
Mpx1
Mpx2
Nca
Solid state
W/ navigation
W/o navigation

Starting Wiring Diagram for Lexus RX 300 2003

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List of elements for Starting Wiring Diagram for Lexus RX 300 2003:

Acc
Am2
Am2 fuse 20a
Battery
Battery ground
Engine control module (behind right side of dash)
Engine room j/b (on left side of engine compartment)
Fusible link block (in engine room j/b)
G12
Ie (at left kick panel)
Ignition switch
Instrument panel j/b (behind left side of dash)
Junction connector 5 (behind upper left side of dash)
Lock
Main fuse 50a
Nca
Park/neutral position switch (on transaxle)
St2
Sta
Start
Starter
Starter fuse 7.5a
Starter relay

SUPPLEMENTAL RESTRAINTS

Supplemental Restraints Wiring Diagram for Lexus RX 300 2003

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List of elements for Supplemental Restraints Wiring Diagram for Lexus RX 300 2003:

(at base of left "b" pillar) left side air bag sensor
(behind center of dash) if
+sl
+sr
-sl
-sr
A10
Air bag squib (front passenger's air bag assembly)
Air bag squib (steering wheel pad)
Body ecu (behind left side of dash)
C14
Center air bag sensor assembly (under center of dash, forward of center console)
Combination meter
D14
Data link connector (dlc) 3 (partial) (under left
E11
E12
Engine control module (behind right side of dash)
Esl
Esr
F/ps
Fsl
Fsr
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/b 5 (behind upper left side of dash)
J/c 15 (under right rear seat)
J/c 17 (under driver's seat)
J/c 18 (under passenger's seat)
J/c 7 (behind upper left side of dash)
J/c 9 (behind right kick panel)
K13
L10
Lbe+
Left buckle switch (on left seat belt buckle)
Left front air bag sensor (in left front corner of engine compartment)
Left pretensioner
Left side air bag squib
Obd2
Pl+
Pl-
Pnk
Pr+
Pr-
Rbe+
Right buckle switch (on right seat belt buckle)
Right front air bag sensor (in right front corner of engine compartment)
Right pretensioner
Right side air bag sensor (at base of right "b" pillar)
Right side air bag squib
Sfl+
Sfl-
Sfr+
Sfr-
Short connector (on left front of engine compart- ment)
Side of dash)
Sil
Solid state
Spiral cable
Srs warning indicator
Srs-ig fuse 15a
Ssl+
Ssr+
Vupl
Vupr