All Wiring Diagrams for Lexus SC 400 1998

AIR CONDITIONING

Air Conditioning Wiring Diagrams (1 of 2) for Lexus SC 400 1998

List of elements for Air Conditioning Wiring Diagrams (1 of 2) for Lexus SC 400 1998:

(console box wire harness, upper center of dash) i31
(front side of right fender) g101
(sc300)
(sc400)
A/c control assembly (behind center of dash)
A/c dual pressure switch (right side of engine compartment)
A/c in
A/c solar sensor (top right side of dash)
Acc
Air inlet control servo motor (behind center of dash)
Air mix control servo motor (top center of dash)
Air vent mode control servo motor (behind center of dash)
Amout
Blw
Cfan
Conn "a"
Conn "b"
Conn "c"
Cool
Def
Defogger system
E18
Face
G203 (right kick panel)
Hot
I36 (a/c sub wire harness)
Ig+
Ign
Igniter (near left strut tower)
Instrument cluster system
Interior lights system (rheostat)
J/b 1 (left kick panel)
J/b 3 (behind center of dash)
Kick panel) g200
Lock in
Mdef
Mface
Mfrs
Mgc
Mrec
Pnk
Rdfgr
Recirc
Red
Reost
Saut
Sc 300 only
Sc 400 only
Set1
Set2
Set3
Set4
Set5
Spd
Tach
Tail
Tam
Tel
Tel in
Telephone transceiver & speaker relay (left rear side of luggage compartment)
Tpi
Tpm
Ver

Air Conditioning Wiring Diagrams (2 of 2) for Lexus SC 400 1998

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List of elements for Air Conditioning Wiring Diagrams (2 of 2) for Lexus SC 400 1998:

(console box wire harness, behind center of dash) i32
(engine room main wire harness, left front side of engine compartment)
(engine wire harness, above glove box) i25
(engine wire harness, center of firewall) (sc 400) e28
(engine wire harness, left side of engine) (sc 300) e20
(front side of left fender) g100
A/c
A/c ambient temperature sensor (right front of engine compartment)
A/c control switch & radio switch
A/c evaporator temp. sensor (behind right side of dash)
A/c lock sensor (left front of engine)
A/c magnetic clutch (left side of engine)
A/c room temperature sensor (behind left side of dash)
A/c single pressure switch (right side of engine compartment) (sc 400)
Acmg
Auto
Blower motor (behind right side of dash)
Blower motor control relay (behind right side of dash)
Cig fuse 15a
Cool
Cooling fan ecu (behind center of dash) (sc 400)
D13
D14
D25
Data link connector (left side of engine)
Def relay
Dome fuse 10a
E18
Ecu-ig fuse 15a
Engine control module (behind center of dash)
Engine coolant temp. sensor (a/c system) (top center of dash)
Engine coolant temperature sensor (cooling fan) (left front of engine compartment) (sc 400)
G101 (front side of right fender)
G203 (right kick panel)
Gnd
Hot at all times
Hot in acc or on
Hot in on or start
Hot w/light switch in tail or head
Htr fuse 10a
Htr fuse 60a
Htr relay
I21 (cowl wire harness, behind right side of dash)
I36 (a/c sub wire har- ness)
I36 (a/c sub wire harness)
Idl
Idlo
Igb
Instrument cluster system
J/b 1 (left kick panel)
J/b 3 (behind center of dash)
Mg clt relay
Panel fuse 7.5a
Pnk
R/b 2 (left side of engine compartment)
Radio temp control switch
Red
Sc 300
Sc 400
Sol+
Sol-
Solenoid valve (cooling fan) (left front of engine) (sc400)
Tac
Th+
Th-
Vsv (water valve) (right side of firewall)

ANTI-LOCK BRAKES

Anti-lock Brake Wiring Diagrams, with Traction Control (1 of 2) for Lexus SC 400 1998

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List of elements for Anti-lock Brake Wiring Diagrams, with Traction Control (1 of 2) for Lexus SC 400 1998:

(behind left side of dash) data link connector 2
(dash harn, right end of dash)
(dash harn, right side of dash)
(front of left front fender) g100
A20
A22
A4/12 pnk
Abs 1 fusible link 60a
Abs actuator (at right rear corner of engine compt)
Abs and traction ecu (above base of right b-pillar)
Abs motor relay
Abs sol relay
Ast
B21
Braided
D/g
Data link connector 1 (3.0l: on left side of engine, near strut tower) (4.0l: at left rear side of engine)
E8 (eng room harness, left fender apron)
Fl+
Fl-
Fr+
Fr-
Fuse block (at left side of engine compt, behind battery)
G101 (front side of right fender)
G203 (right kick panel)
Gnd1
Gnd2
Gnd3
Gnd4
H13
Hot at all times
I17
I20
Ind
Instrument cluster system
Junction block 3 (behind center of dash) h12
Junction connector j/c 2 (center of rear shelf)
Left front abs speed sensor (left front wheel assembly)
Left rear abs speed sensor (left rear wheel assembly)
Pnk
R/b 6 (on left side of engine compartment, behind strut tower)
Red
Right front abs speed sensor (right front wheel assembly)
Right rear abs speed sensor (right rear wheel assembly)
Sflh
Sflr
Sfrh
Sfrr
Smc
Spc
Spd
Src
Srlh
Srlr
Srrh
Srrr
Trc+
Trc-

Anti-lock Brake Wiring Diagrams, with Traction Control (2 of 2) for Lexus SC 400 1998

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List of elements for Anti-lock Brake Wiring Diagrams, with Traction Control (2 of 2) for Lexus SC 400 1998:

(3.0l)
(4.0l)
A21
Abs
Abs & traction ecu (above base of right b-pillar)
B21
Braided
Brake fluid level switch (in brake fluid reservoir)
C10
C12
C25
Combination meter
Csw
D13
E12
E18
E20
Ecu-ig fuse 15a
Efi+
Efi-
Engine control module (behind lower right side of dash)
G200 (left kick panel)
G203 (right kick panel)
Gauge fuse 10a
Hot at all times
Hot in run
I10
Ig1
J/b 1 (behind left kick panel)
J/b 3 (behind center of dash)
Junction connector j/c 2 (center of rear shelf)
Lbl+
Lbl-
Neo
Parking brake switch (at base of parking brake lever)
Red
Rl+
Rl-
Rr+
Rr-
Stop fuse 15a
Stoplight switch (on brake pedal support)
Stp
Stp, bk
Trac
Trac off
Traction cut switch
Trc+
Trc-

Anti-lock Brake Wiring Diagrams, without Traction Control for Lexus SC 400 1998

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List of elements for Anti-lock Brake Wiring Diagrams, without Traction Control for Lexus SC 400 1998:

(3.0l: on left side of engine, near strut tower) (4.0l: at left rear side of engine)
(behind left side of dash)
(dash harn, right end of dash)
(engine harn, left fender apron)
(engine harn, left side of engine compt)
(front side of left fender) g100
(on left side of engine compt, behind strut tower)
A23
A24
Abs 1 fusible link 60a
Abs actuator (at right rear corner of engine compt)
Abs ecu (behind right side of dash)
Abs indicator
Abs motor relay
Abs sol relay
Ast
Braided
C12
C25
Combination meter
D/g
D13
Data link connector 1
Data link connector 2
E12
E20
Ecu-ig fuse 15a
Fl+
Fl-
Fr+
Fr-
Fuse block (at left side of engine compt, behind battery)
G101 (front side of right fender)
G203 (right kick panel)
Gauge fuse 15a
Gnd1
Gnd2
H12
H13
Hot at all times
Hot in run
I10
I20
I24
Ig1
J/b 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Left front abs speed sensor (left front wheel assembly)
Left rear abs speed sensor (left rear wheel assembly)
R/b 6
Red
Right front abs speed sensor (right front wheel assembly)
Right rear abs speed sensor (right rear wheel assembly)
Rl+
Rl-
Rr+
Rr-
Sflh
Sflr
Sfrh
Sfrr
Srh
Srr
Stop fuse 15a
Stoplight switch (on bracket, above brake pedal)
Stp

ANTI-THEFT

Anti-theft Wiring Diagram (1 of 2) for Lexus SC 400 1998

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List of elements for Anti-theft Wiring Diagram (1 of 2) for Lexus SC 400 1998:

(above base of right b-pillar) wireless door lock control ecu
(body harn, left rear wheelwell)
(dash harn, lower right end of dash)
(dash harn, top center of dash)
(dash harn, top center of dash) i14
(dash harn, upper left side of dash)
(dash harn, upper right side of dash)
(rear of right door sill) g316
Acc
Act+
Act-
Actd
B1+
B18
B22
Bzr
Bzr2
Cig fuse 15a
Cty
Diode
Dome fuse 10a
Door fuse 30a
Dswd
Dswh
Dswl
Dswp
Ecu-ig fuse 15a
Engine hood courtesy switch (center front of engine compartment)
G101 (right front fender)
G200 (left kick panel)
Gauge fuse 10a
Grd
H10
Head
Headlights system
Horn
Horn relay
Hot at all times
Hot in run
Hot in run or accy
Hot in run or start
I14
I14 (dash harn, top center of dash)
I16
I22
I22 (dash harn, lower right end of dash)
Ind
Integration relay
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
K13
Ksw
Left front door key lock/unlock switch
Lock
Lswd
Lswp
Lug
Luggage compartment light switch (center rear of trunk)
Master power window/door lock control switch
Of dash)
Pnk
Power circuit breaker 30a
Power main relay
Prly
Red
Relay block 2 (on left side of engine compt, behind battery)
Right front door key lock/unlock switch
Right front door lock control switch
Srly
Starter relay
Tail
Taillight relay
Theft deterrent & door lock ecu (behind instrument cluster)
Tsw
Ul1
Ul2
Ul3
Unlock
Wireless door lock buzzer (at left side of engine compartment, near strut tower)

Anti-theft Wiring Diagram (2 of 2) for Lexus SC 400 1998

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List of elements for Anti-theft Wiring Diagram (2 of 2) for Lexus SC 400 1998:

(dash harn, top center of dash) i14
B15
Combination meter
D10
G200 (left kick panel)
G203 (right kick panel)
G407 (center rear of trunk)
H13
Haz-horn fuse 15a
Horn relay
Hot at all times
I2 (dash harn, left end of dash)
Junction block 1 (behind left kick panel)
Left lock/ unlock motor & door detection position switch
Luggage comparment door opener motor (center rear of trunk)
Luggage compartment door open switch
Luggage compartment key unlock switch (right rear of trunk)
Pnk
Red
Relay block 2 (on left side of engine compt, behind battery)
Right lock/ unlock motor & door detection position switch
Theft deterrent horn (left rear of eng compt)
Trip switch & theft deterrent indicator switch
Unlock warning switch (ignition switch)

COMPUTER DATA LINES

Computer Data Lines for Lexus SC 400 1998

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List of elements for Computer Data Lines for Lexus SC 400 1998:

(dash harness, top center of dash) i9
(left kick panel)
(on intake manifold) (sc 300) g131
(sc 400) g120 (right rear side of cylinder head)
A/d
A22
A24
Abs
Abs and traction ecu (behind glove box)
Abs ecu (behind glove box)
Abs solenoid relay (r/b 6)
Abs w/ traction control
Abs w/o traction control
Airbag sensor assembly (behind center console)
Bat
C12
C13
C14
Combination meter
Cooling fan ecu (behind right side of dash)
D/g
D11
Data link connector 1 (left side of engine)
Data link connector 2 (behind left side of dash)
Data link connector 3 (behind left side of dash)
E10
E18
E19
E20
E28 (sc 400) e24 (sc 300)
E30 (sc300) (engine harness, left side of engine)
E31 (sc400) (engine harness, left side of engine compartment)
Efi fuse 30a
Efi main relay
Engine control module (behind right side of dash)
Engine coolant temp sensor (behind upper right side of dash)
G200
H13
Hot at all times
I17
I20 (i/p harness, right side of dash)
I21 (dash harness, lower right end of dash)
I25 (dash harness, right side of dash)
J/b 1 (left kick panel)
J/b 3 (behind combination meter)
Nca
Obd fuse 7.5a
R/b 2 (left side of eng compt)
Sil
Th+
Trc

COOLING FAN

Cooling Fan Wiring Diagram for Lexus SC 400 1998

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List of elements for Cooling Fan Wiring Diagram for Lexus SC 400 1998:

1994 vftc c
A/c control assembly (behind center of dash)
A/c single pressure switch (right side of engine compt)
A11
C25
Cfan
Combi- nation meter
Cool
Cooling fan ecu (behind right side of dash)
Data link connector 1 (at left rear side of engine)
E18
Ecu-ig fuse 15a
Engine control module (behind lower right side of dash)
Engine coolant temperature sensor (at left front of engine compt, near left side of radiator)
G101 (front side of right fender)
G203 (right kick panel)
Hot in run or start
I21 (dash harn, lower right end of dash)
Idl
Idlo
Igb
Junction block 1 (behind left kick panel)
Sol+
Sol-
Solenoid valve (cooling fan) (at left front of engine)
Tac
Th+
Th-

CRUISE CONTROL

Cruise Control Wiring Diagram for Lexus SC 400 1998

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List of elements for Cruise Control Wiring Diagram for Lexus SC 400 1998:

(behind left
(dash harness, right side of dash) i25
(engine harness left rear of engine)
(left cylinder head)
(left rear
+b1
+bm
A/d
A/t indicator switch
Accel position sensor (top center of engine)
Batt
Braided
C14
C25
Cancel
Ccs
Cl+
Cl-
Combination meter
Conn e15
Conn e16
Conn e17
Conn e18
Conn e19
Conn e20
Cruise control switch
Cruise ind
D13
E01
E02
E03
E12
E28
E28 (engine harn, center of firewall)
E29
Efi fuse 30a
Efi main relay
Engine control module (behind lower right side of dash)
Etcs fuse 15a
G100 left side of engine comprt.)
G112
G112 (left cylinder head)
G120 (right rear side of cylinder head)
Gauge fuse 10a
Ge01
H12
Hot at all times
Hot in on or start
I10
I25 (dash harn, right side of dash)
I5 (dash harn, left end of dash)
Ign fuse 7.5a
Igsw
J/b 3 (behind center of dash)
Junction block 1
Main
Me01
Mrel
Pnk
Red
Relay block 2
Res/ acc
Set/ coast
Side of dash) data link connector 2
Side of engine) data link connector 1
Sp2+
Sp2-
St1-
Stop fuse 15a
Stoplight switch (on bracket, above brake pedal)
Stp
Throttle control motor (on throttle body)
Throttle position sensor (on throttle body)
Vehicle speed sensor 2 (on transmission)
Vpa
Vpa2
Vta
Vta2

DEFOGGERS

Defogger Wiring Diagram for Lexus SC 400 1998

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List of elements for Defogger Wiring Diagram for Lexus SC 400 1998:

A13
A14
B10
Def fuse 50a
Defogger relay
E18
G100 (front side of left fender)
G200 (left kick panel)
G203 (right kick panel)
G302 (below right b-pillar)
Gnd
Harn, left front fender)
Heater
Hot at all times
Htr fuse 10a
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Left remote control mirror
Mir-htr fuse 10a
Noise filter (at left side of engine compt near fuse block)
R-def
Rear window defogger
Rear window defogger switch (a/c control assembly)
Relay block 2 (on left side of engine compt behind battery)
Relay block 2 (on left side of engine compt, behind battery)
Right remote control mirror
W/ mem seat w/0 mem seat

ELECTRONIC POWER STEERING

Electronic Power Steering Wiring Diagram for Lexus SC 400 1998

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List of elements for Electronic Power Steering Wiring Diagram for Lexus SC 400 1998:

Abs & traction ecu (above base of right b pillar)
Abs ecu (behind right side of dash)
C14
C25
Combination meter
D13
E12
Ecu-ig fuse 15a
G206 (left instrument panel brace)
G302 (under left side of ashtray)
Gauge fuse 10a
Hot in on or start
J/b 1 (behind left kick panel)
J/b 3 (behind center of dash)
Pps ecu (behind right side of dash)
Pps solenoid (at left front of engine)
Sol+
Sol-
Sp1
Spd
W/ traction control
W/o traction control

ENGINE PERFORMANCE

4.0L

4.0L, Engine Performance Wiring Diagrams (1 of 4) for Lexus SC 400 1998

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List of elements for 4.0L, Engine Performance Wiring Diagrams (1 of 4) for Lexus SC 400 1998:

(dash harn, right side of dash)
(eng harn, left side of engine)
(engine harn, center of firewall)
(engine harn, left rear of engine)
(engine harn, left side of eng compt)
(left cylinder head)
(left cylinder head) g112
(right cylinder head)
Acis
Braided
Camshaft position sensor (left front of engine)
Cl-
Conn e15
Conn e16
Crankshaft position sensor (left front of engine)
E01
E02
E03
E26
E27
E27 (engine harn, right side of firewall)
E28
E29
E30
E31
Engine control module (behind lower right side of dash)
Evg
G112
G112 (left cylinder head)
G120
G120 (right cylinder head)
Ge01
Htl
Htr
I25
I25 (dash harn, right side of dash)
I29
Igf1
Igf2
Ignition coil & igniter 1
Ignition coil & igniter 2
Ignition coil & igniter 3
Ignition coil & igniter 4
Ignition coil & igniter 5
Ignition coil & igniter 6
Ignition coil & igniter 7
Ignition coil & igniter 8
Igt1
Igt2
Igt3
Igt4
Igt5
Igt6
Igt7
Igt8
Instrument cluster system
Knkl
Knkr
Knock sensor 1 (top center of engine)
Knock sensor 2 (top center of engine)
Left camshaft timing oil control valve (left front of engine)
Left vvt sensor (top left side of engine)
Mass airflow meter (in air intake duct)
Me01
Ne+
Ne-
Noise filter (left rear corner of engine)
Ocv+
Ocv-
Oxl1
Oxr1
Pnk
Prg
Red
Right vvt sensor (top right side of engine)
Tha
Throttle control motor (on throttle body)
Thw
Vpa
Vpa2
Vsv (acis) (top rear of engine)
Vsv (evap) (top rear of engine)
Vta
Vta2
Vvl+
Vvl-
Vvr+
Vvr-

4.0L, Engine Performance Wiring Diagrams (2 of 4) for Lexus SC 400 1998

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List of elements for 4.0L, Engine Performance Wiring Diagrams (2 of 4) for Lexus SC 400 1998:

(dash harn, lower right end of dash) i21
(dash harn, right side of dash)
(engine harn, center of firewall)
(engine harn, left fender apron) e8
(engine harn, right side of firewall)
(in fuel tank) fuel pump
(left side of luggage compartment) fuel pump ecu
Acc
Accel position sensor (top center of engine)
Am2
Braided
E26
E26 (engine harn, right side of firewall)
E27
E28
E29
E29 (engine harn, left rear of engine)
Efi fuse 30a
Efi main relay
Engine coolant temperature sensor (right front top of engine)
Fpc
G100 (front of left front fender)
G112 (left cylinder head)
G120 (right cylinder head)
G308 (base of left "b" pillar)
Heated oxygen sensor (bank 1 sensor 1) (on left side of engine, in exhaust manifold)
Heated oxygen sensor (bank 2 sensor 1) (on right side of engine, in exhaust manifold)
Hot at all times
Htl
Htr
I25
I27
Ign fuse 7.5a
Ignition switch
Injector 1
Injector 2
Injector 3
Injector 4
Injector 5
Injector 6
Injector 7
Injector 8
Instrument cluster system
Junction block 1
Lock
Oxl1
Oxr1
P/n
Park/neutral position switch (on transmission)
Pnk
Red
Relay block 2 (on left side of engine compt, behind battery)
Short connector (right side of dash)
St fuse 7.5a
Start
Starting/ charging system
Throttle position sensor (on throttle body)
Transmission control switch

4.0L, Engine Performance Wiring Diagrams (3 of 4) for Lexus SC 400 1998

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List of elements for 4.0L, Engine Performance Wiring Diagrams (3 of 4) for Lexus SC 400 1998:

(dash harn, lower right end of dash)
(dash harn, right end of dash)
(dash harn, right side of dash)
(dash harn, top center of dash) i9
(left kick panel)
(under center console) shift lock ecu
A/t indicator switch (integral to park/neutral position switch) (on transmission)
Abs ecu (right side of dash)
Braided
C12
C13
C14
C25
Combination meter
D13
E12
E18
Electronically controlled transmission pattern select switch
G120 (right cylinder head)
G200
Gauge fuse 10a
H12
Heated oxygen sensor (bank 1 sensor 2) (on exhaust system, near catalytic converter)
Heated oxygen sensor (bank 2 sensor 2) (on exhaust system, near catalytic converter)
Hot at all times
Hot in on or start
Htl2
Htr2
I10
I17
I20
I21
I26
I27
Junction block 1
Junction block 1 (behind left kick panel)
Junction block 3
Junction block 3 (behind center of dash)
Malfunction indicator light
Obd fuse 7.5a
Oxl2
Oxr2
Pnk
Pwr
Red
Snow
Stop fuse 15a
Stoplight switch (on bracket, above brake pedal)
Vapor pressure sensor (under right rear of vehicle, near wheelwell)

4.0L, Engine Performance Wiring Diagrams (4 of 4) for Lexus SC 400 1998

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List of elements for 4.0L, Engine Performance Wiring Diagrams (4 of 4) for Lexus SC 400 1998:

(2000)
(behind left side of dash) data link connector 3
(dash harn, top center of dash)
(dash harn, upper right side of dash)
(engine harn, left rear of engine)
(engine harn, left side of eng compt)
(left rear side of engine)
(on transmission) o/d direct clutch speed sensor
(under
+b1
+bm
A/c
Acmg
Anti-lock brakes system
Bat
Batt
Braid
Ccs
Ccv
Cl+
Code
Conn e17
Conn e18
Conn e19
Conn e20
Cooling fan ecu
Cruise control switch a/c control assy
Cruise control system
Data link connector 1
Data link connector 2 (left side of dash)
E18
E28
E29
E32
Electronically controlled transmission solenoid (in transmission)
Els
Eng+
Eng-
Engine control module (unused pins not shown) (behind lower right side of dash)
Eom
Etcs fuse 15a
Fpc
G112 (left cylinder head)
G120 (right cylinder head)
G200 (left kick panel)
G206 (left instrument panel brace)
G302 left ashtray)
H13
Hot at all times
Htl2
Htr2
I20
I25
I26
Idlo
Igsw
Imld
Junction block 1
Junction block 3
Key unlock warning switch
Ksw
Mg clt relay
Mrel
Nco+
Nco-
Neo
Ocr+
Ocr-
Oil
Oxl2
Oxr2
Pnk
Ptnk
Pwr
Pwrl
Red
Relay block 2
Right camshaft timing oil control valve (top right front of engine)
Rspd
Rxck
Sil
Sln+
Sln-
Slt+
Slt-
Slu+
Slu-
Snwi
Snwl
Sp2+
Sp2-
Sta
Sti-
Stp
Tach
Tachometer
Tail fuse
Theft deterent indicator
Tpc
Transponder key amplifier (behind left side of dash)
Trc+
Trc-
Txct
Vehicle speed sensor (on transmission)
Vsv (canister closed valve) (on right side of engine compt)
Vsv (pressure switching valve) (under right rear of vehicle)

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for Lexus SC 400 1998

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List of elements for Back-up Lamps Wiring Diagram for Lexus SC 400 1998:

(body harness, left rear of trunk) b27
B27
Back- up lamp
Back-up light switch (part of park/ neutral switch)
G407 (center rear of trunk)
Gauge fuse 10a
H12
Hot in on or start
Junction block 1 (behind left kick panel)
Left rear combination light
Right rear combination light

Exterior Lamps Wiring Diagram (1 of 2) for Lexus SC 400 1998

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List of elements for Exterior Lamps Wiring Diagram (1 of 2) for Lexus SC 400 1998:

(body harn, behind left taillight) b27
(body harness, left door sill)
Am1 fusible link 100a
Auto
Automatic light control sensor
B23
B25
B25 (body harness, top of left quarter panel)
B27
C10
C14
C16
C25
Combination meter
Combination switch
D13
Diode
E12
Fuse block (at left side of engine compartment, behind battery)
G200 (left kick panel)
G309 (rear of left door sill)
G316 (rear of right door sill)
G407 (center rear of trunk)
Gauge fuse 10a
Head
High high high high high high mount mount mount mount mount mount stop stop stop stop stop stop light light light light light light
Hot at all times
Hot in on or start
I10
Integration relay (left side of dash)
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
K11
Left rear combination light
License plate light
Light failure sensor (left rear side of luggage compartment)
Off
Rear light warning light
Right rear combination light
Spoiler spoiler spoiler spoiler spoiler spoiler
Stop fuse 15a
Stop light
Stoplight switch (near brake pedal)
Tail
Tail fuse 15a
Tail- lights
Taillight relay
Turn signal light
Turn signal light
W/ rear w/ rear w/ rear w/ rear w/ rear w/ rear spoiler spoiler spoiler spoiler spoiler spoiler
W/o rear w/o rear w/o rear w/o rear w/o rear w/o rear

Exterior Lamps Wiring Diagram (2 of 2) for Lexus SC 400 1998

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List of elements for Exterior Lamps Wiring Diagram (2 of 2) for Lexus SC 400 1998:

(dash harn, upper left end of dash)
(dash harn, upper left side of dash) i8 (4.0l)
(dash harness, top center of dash) i9
(engine harness, left fender apron) e10
(engine harness, upper right radiator support) e2
A10
B14
C13
C25
Combination meter
Combination turn signal switch switch
D10
E18
E19
G100 (front side of left fender)
G101 (front side of right fender)
G200 (left kick panel)
H11
Haz-horn fuse 15a
Hazard switch
Hot at all times
Hot in run
I9 (3.0l) (dash harn, top center of dash)
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Left
Left front parking light
Left front side marker light
Left front turn light
Left turn signal ind
Relay block 2 (on left side of engine compt, behind battery)
Relay block 4 (behind left kick panel, on front side of junction block 1)
Right
Right front parking light
Right front side marker light
Right front turn light
Right turn signal ind
Turn fuse 7.5a
Turn signal flasher

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 4) for Lexus SC 400 1998

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List of elements for Ground Distribution Wiring Diagram (1 of 4) for Lexus SC 400 1998:

(3.0l only)
(3.0l)
(4.0l)
(body harness, left rear wheelwell) b18
(dash harn, right side of dash) i17
(engine harn, left side of engine compt) e9
(engine harn, upper right radiator support) e2
(engine harness, upper right radiator support) e1
(engine harness, upper right radiator support) e2
(w/ tcs) (w/o tcs)
A/c dual pressure switch
A/c single pressure switch
A11
A21
A30
A5 a7
Abs actuator
Abs solenoid relay
B17
Brake fluid level switch
C12
Combination meter
Cruise control switch
Data link conn- ector 1
Data link conn- ector 2
Data link conn- ector 3
E15
E16
E19
E2 (engine harness, upper right radiator support)
E22
E4 (engine harness, upper left radiator support)
E7 (engine harn, right fender apron)
E8 (engine harness, left fender apron)
Efi main relay
Engine hood courtesy switch
Engine control module
Engine oil level warning switch
G100 (front side of left fender)
G101 (front side of right fender)
G131 (on intake manifold)
Heated oxygen sensor (bank 1, sensor 1)
Heated oxygen sensor (bank 1, sensor 2)
Heated oxygen sensor (bank 2, sensor 1)
Htr relay
I20 (dash harn, right end of dash)
I25 (dash harn, right side of dash)
Igniter
Ignition system noise filter
Left front fog light
Left front parking light
Left front side marker light
Left front turn signal light
Left low beam headlight
Mobile phone
Nca
Noise filter (defogger system)
Power steering oil pressure switch
Relay block 2 (on left side of engine compt, behind battery)
Relay block 6 (on left side of engine compt, behind strut tower)
Right front fog light
Right front parking light
Right front side marker light
Right front turn signal light
Right low beam headlight
T15
Telephone transceiver & speaker relay
Washer level switch

Ground Distribution Wiring Diagram (2 of 4) for Lexus SC 400 1998

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List of elements for Ground Distribution Wiring Diagram (2 of 4) for Lexus SC 400 1998:

(4.0l only)
(dash harn, top center of dash) i9
(w/ memory)
A21
A31
Auto antenna motor & relay
B17
B18 (body harness, left side of passenger compt)
B27 (body harness, left rear of trunk)
C12
Combination meter
Cruise control switch
Data link conn- ector 2
Data link conn- ector 3
Driver's power seat control switch
Driver's power seat ecu
Driver's seat heater
E15
E16
E26 (engine harn, right side of firewall)
E28 (engine harn, center of firewall)
Engine control module
Engine oil level warning switch
Fuel pump
Fuel pump ecu
G112 (left rear side of cylinder head)
G120 (right rear side of cylinder head)
G309 (rear of left door sill)
G407 (center rear of trunk)
Heated oxygen sensor (bank 1, sensor 1)
Heated oxygen sensor (bank 1, sensor 2)
Heated oxygen sensor (bank 2, sensor 1)
Heated oxygen sensor (bank 2, sensor 2)
I17 (dash harn, right side of dash)
Igntion coil & igniter 1
Igntion coil & igniter 2
Igntion coil & igniter 3
Igntion coil & igniter 4
Igntion coil & igniter 5
Igntion coil & igniter 6
Igntion coil & igniter 7
Igntion coil & igniter 8
Left buckle switch
Left rear combination light
License plate light
Light failure sensor
Luggage compartment key unlock switch
Nca
P13
Right rear combination light

Ground Distribution Wiring Diagram (3 of 4) for Lexus SC 400 1998

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List of elements for Ground Distribution Wiring Diagram (3 of 4) for Lexus SC 400 1998:

(behind left kick panel, on front side of junction block 1) relay block 4
(body harness, center of windshield header) b7
(body harness, inside left door) b3
(body harness, left a-pillar) b6
(dash harn, right side of combination meter) i12
(dash harn, right side of combination meter) i13
(dash harn, upper left end of dash) i3
(dash harn, upper right end of dash) i19
(w/ memory)
A/c control assembly
A10
A11
A13 b5 (w/o memory)
Airbag sensor assembly
B6 (body harness, left a-pillar)
C13
C16
Combination meter (4.0l only)
Cooling fan ecu
D10
Dimmer switch (combination switch)
E18
G200 (left kick panel)
G206 (left instrument panel brace)
H13
I14 (dash harn, top center of dash)
I2 (dash harness, left end of dash)
I3 (dash harn, upper left end of dash)
I5 (dash harn, upper left end of dash)
Ignition main relay
Inner mirror
Integration relay
Junction block 1 (behind left kick panel)
K12
Key interlock solenoid (ignition switch)
Left door key lock & unlock switch
Left door lock/ unlock motor & door detection position switch
Left high beam headlight (4.0l only)
Left power window master switch & door lock control switch
Left remote control mirror
Left vanity light
Light control switch (combination switch)
Moon roof control relay
Moon roof control switch
Moon roof limit switch
Moon roof motor
Personal light
Power main relay
Pps ecu
Red
Remote control mirror switch
Right high beam headlight (4.0l only)
Right vanity light
Theft deterrent & door lock ecu
Tilt & power telescopic ecu
To g203 (diagram 4 of 4)
To junction block 3, pin a1 (diagram 4 of 4)
Turn signal flasher
Unlock warning switch (ignition switch)
Upper right radiator support)
W/ moon roof
W/o moon roof
Wiper & washer switch (combination switch)
Wiper motor

Ground Distribution Wiring Diagram (4 of 4) for Lexus SC 400 1998

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List of elements for Ground Distribution Wiring Diagram (4 of 4) for Lexus SC 400 1998:

(body harn, right door sill)
(w/ memory) a13
1 (or 2)
A/c control assembly
A10
A20
A22
A24
Abs & traction ecu
Abs ecu
B10 (body harn, under left front seat)
B11 (body harn, left side of left front seat back)
B12
B18
B25
B8 (body harn, under left front seat)
Blower motor control relay
C24
C25
Cigarette lighter
Combination meter
D10
Data link connector 3
Driver's power seat control switch
Driver's seat recline motor
Driver's seat slide position sensor
Driving position memory & return switch
E19
E20
E22
Electronically controlled transmission pattern select & seat heater switches
Engine control module
From g206 (diagram 3 of 4)
From junction block 1, pin e18 (diagram 3 of 4)
Front vertical position sensor
Fuel lid opener solenoid
G203 (right kick panel)
G302 (under left side of ashtray)
G316 (rear of right door sill)
G905 (right c-pillar)
Glove box light switch
H15
High mounted stop light
I21 (dash harn, lower right end of dash)
I22 (dash harn, lower right end of dash)
I24 (dash harn, lower right side of dash)
I8 (dash harn, upper left side of dash)
Junction block 3 (behind center of dash)
Junction connector j/c 2 (center of rear shelf)
Luggage compartment door opener switch
P14
Passenger's power seat control switch
Passenger's seat back heater
Power seat ecu
Rear vertical position sensor
Rear window defogger
Rheostat
Right door key lock & unlock switch
Right door lock control switch
Right door lock motor, door unlock detection switch & open detection switch
Right remote control mirror
Shift lock ecu
Tilt & power telescopic ecu
Traction cut switch
Wireless door lock control ecu

HEADLIGHTS

Headlight Wiring Diagram for Lexus SC 400 1998

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List of elements for Headlight Wiring Diagram for Lexus SC 400 1998:

(behind center of dash) junction block 3
(dash harn, left side of dash)
(dash harness, at left kick panel)
(engine harn, front of eng compt)
(engine harn, right front of eng compt) (4.0l only) e1
(or red)
3.0l
3.0l only
4.0l
4.0l only
Auto
Automatic light control sensor (left side of dash)
C13
C25
Combination meter
Combination switch
Cty
D10
D23
Dimmer relay
Dimmer switch
Dome fuse 10a
E10 (engine harn, left side of eng compt)
E13
E17
E18
Ecu-b fuse 15a
Ecu-ig fuse 15a
Exterior lights system (taillight relay)
Flash
Fog fuse 15a
Fog light relay
Fog light switch
Fuse block
G100 (front side of left fender)
G101 (front side of right fender)
G200 (left kick panel)
Gauge fuse 10a
Head
Head (lh) fuse 15a
Head (lh- lwr) fuse 15a
Head (lh- upr) fuse 15a
Head (rh) fuse 15a
Head (rh- lwr) fuse 15a
Head (rh- upr) fuse 15a
Head indic
Headlight relay
High
High beam indicator
Hot at all times
Hot in start or run
I16
I3 (dash harness, left kick panel)
Integration relay
Junction block 1 (behind left kick panel)
K12
Left door lock/ unlock motor & door detection position switch
Left fog light
Left hi beam head- light
Left low beam head- light
Light control switch
Main fuse 60a
Off
Red
Relay block 2 (on left side of engine compt, behind battery)
Relay block 4 (behind left kick panel, on front side of junction block 1)
Relay block 5 (behind left kick panel, on rear side of junction block 1)
Right fog light
Right hi beam head- light
Right low beam head- light
Tail

HORN

Horn Wiring Diagram for Lexus SC 400 1998

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List of elements for Horn Wiring Diagram for Lexus SC 400 1998:

(upper left radiator support) e4
Combination switch
Haz-horn fuse 15a
Horn
Horn relay
Horn switch
Hot at all times
Left horn
R/b 2 (on left side of engine compartment, behind battery)
R/b 4 (behind left kick panel, on front side of junction block 1)
Right horn
Theft deterrent & door lock control ecu (behind instrument cluster)

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram (1 of 2) for Lexus SC 400 1998

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List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Lexus SC 400 1998:

(front side of intake manifold) g110 (sc 300)
(i/p harn, left center of dash)
(i/p harn, right side of dash)
(sc400) (sc300)
A/c and electronic power steering systems
A/c control assembly
A10
Abs ind
All times
Anti-lock brake system
B10
B11
B12
B13
Brake ind
C10
C11
C12
C13
C14
C15
C16
C25
Charge ind
Combination meter
Cruise ind
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D5 d8
Door ind
Drive monitor
E12
E13
Ecu-b fuse 15a
Engine control system
Engine controls system
Exterior lights system
Exterior lights system (turn flasher)
Fuel
Fuel injector 1
Fuel sender (in fuel tank)
G117 (sc 400) (right rear side of cylinder head)
G202 (below left ashtray)
Gauge fuse 10a
H12
Head ind
Head- lights system
High beam ind
Hot at
Hot in on or start
Hot in run
Hot with taillight relay energized
I8 (i/p harn, left center of dash)
Ign fuse 7.5a
Illumination
J/b 1 (left side of dash)
J/b 3 (behind center of dash)
J/b 3 (center of dash)
L (sc400)
Left turn ind
Low fuel ind
Malfunction ind
Oil ind
Oil level ind
Oil pressure switch (left side of eng)
Panel fuse 7.5a
Power ind
Rear lt ind
Red
Rheostat
Right turn ind
Sc300
Sc400
Seat belt ind
Snow ind
Speedometer/ odometer/ tripmeter
Srs ind
Starting/ charging system (generator)
Trac ind
Trac off ind
Warning system
Warning systems
Washer level ind
Water temp
Water temperature sender (left side or engine)

Instrument Cluster Wiring Diagram (2 of 2) for Lexus SC 400 1998

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List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Lexus SC 400 1998:

(i/p harn, right end of dash)
(i/p harn, right side of dash)
(i/p harness, left kick panel)
(sc400) (sc300)
A/b
A/t indicator switch
Anti-theft system
Brake fluid level warning switch (on brake fluid reservoir)
Clock/ outside temp
Cooling fan ecu
Dome fuse 10a
E18
Engine control module (behind lower right side of dash)
Engine controls system
Engine oil level warning switch (left front of engine)
G100 (front of left front fender)
G101 (front side of right fender)
G114 (sc 400) (left rear side of cylinder head)
G117 (sc 300) (right rear side of cylinder head)
Hot at all times
Hot in start
I20
I20 (sc300) i27 (sc400)
I25 (sc 300) i28 (sc 400) (i/p harness, right side of dash)
I25 (sc300) i27 (sc400)
I25 (sc400) i26 (sc300) (i/p harn, right side of dash)
I26
I27
Igniter (left side of engine compartment)
J/b 1 (left side kick panel)
J/b 2 (left side of eng compt)
J/b 3 (behind center of dash)
J/b 3 (center of dash)
Oil level
Oil temp
P/n
Park/ neutral position switch (on trans- mission)
Parking brake switch (below console)
Red
Reset
Sc300
Sc400
Set
Short connector
St fuse 7.5a
Starter relay
Theft
Trip
Trip switch & theft deterrent indicator light
W/o traction control
Washer fluid level switch (left front of engine compt)

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram for Lexus SC 400 1998

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List of elements for Courtesy Lamps Wiring Diagram for Lexus SC 400 1998:

(body harn, inside left door) b1
(body harness, center of windshield header) b7 (w/o moon roof)
(body harness, left a-pillar) b6
(dash harness, upper left end of dash) i5
(right kick panel)
B1 (body harness, inside left door)
B6 (body harness, left "a" pillar)
B7 (body harness, center of windshield header)
Combination meter
D10
Dome fuse 10a
Door
Door open warning light
E11
G200 (left kick panel)
G203
Gauge fuse 10a
H10
Hot at all times
Hot in on or acc
Hot in on or start
I16
I3 (dash harness, upper left end of dash)
Ignition key cylinder light
Integration relay
Interior
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Left door courtesy lamp
Left door unlock & door open detection switch
Left vanity light
Luggage compartment lamp
Luggage compartment light switch
Map
Off
Personal light
Pnk
Radio 2 fuse 7.5a
Red
Red i22 (dash harn, lower right end of dash)
Relay block 2 (on left side of engine compartment behind battery)
Relay block 4 (behind left kick panel, on front side of junction block 1)
Right door courtesy lamp
Right door unlock & door open detection switch
Right vanity light
Step light

Instrument Illumination Wiring Diagram for Lexus SC 400 1998

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List of elements for Instrument Illumination Wiring Diagram for Lexus SC 400 1998:

(dash harness, behind radio) i32
(dash harness, right side of steering column) i38
(w/ cd player) (w/o cd player)
A/c control &
A/c control assembly (behind center of dash)
A/t shift lever illumination lamp
A10
A12
Am1 fusible link 100a
C12
C25
Cigarette lighter lamp
Combination meter
E18
Electronic controlled transmission pattern select & seat heater switch
Fuse block (at left side of engine compt, behind battery)
G200 (left kick panel)
Glove box lamp
Glove box light switch
H10
Hazard switch lamp
Head
Hot at all times
I16
I32 (dash harness, behind radio)
I8 (dash harness, upper left side of dash)
Integration relay (on junction block 1)
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
K11
Light control switch (part of combination switch)
Off
Panel fuse 7.5a
R3 r4
R3 r5
Radio & player lamp
Radio switch lamp
Rheostat
Solid state
Tail
Taillight relay
Trip switch & theft deterrent

MEMORY SYSTEMS

Memory Mirrors Wiring Diagram for Lexus SC 400 1998

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List of elements for Memory Mirrors Wiring Diagram for Lexus SC 400 1998:

(dash harn, upper left end of dash) i3
Acc
Down
Driver's power seat ecu (under driver's seat)
Driver's power seat ecu shield
Driving position memory & return switch (left side of dash)
Dsw
Ecu-b fuse 15a
Ecue
G200
G206 (left instrument panel brace)
G302 (under left side of ashtray)
Gnd
Hot at all times
Hot in acc or on
Hsrl
Hsrr
I10 (dash harn, right side of combination meter)
I14
I14 (dash harness, top center of dash)
I16
Junction block 1 (behind left kick panel)
Left
Left door open detection switch
Left remote control mirror
Left/ right
M+l
M+r
Mhl
Mhr
Mry
Mvl
Mvr
N0. 1
N0. 2
Nca
Operation switch
Pnk
Rad fuse 7.5a
Remote control mirror ecu (behind left center of dash)
Remote control mirror switch
Right
Right remote control mirror
Select switch
Set
Swb
Swe
Swlh
Swlv
Swrh
Swrv
Tilt & power telescopic ecu (behind left side of dash)
Up/ down
Vsrl
Vsrr

Memory Power Tilt & Power Telescopic Wiring Diagram for Lexus SC 400 1998

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List of elements for Memory Power Tilt & Power Telescopic Wiring Diagram for Lexus SC 400 1998:

(body harn, under left front seat)
(dash harn, behind combination meter)
(dash harn, behind combination meter) i6
(dash harn, left end of dash) i1
(dash harn, upper left end of dash)
(or red)
Asw
Auto sw
B4 (body harness, left door sill)
D10
Dome fuse 10a
Driver's power seat ecu (under driver's seat)
Driver's power seat ecu shield
Driving position memory & return switch (left side of dash)
Dsw
Ecu-b
Ecu-ig fuse 15a
Ecue
G200 (left kick panel)
G206 (left instrument panel brace)
G302 (under left side of ashtray)
Gauge fuse 10a
Gnd
H10
H12
H13
H15
Hot at all times
Hot in start or run
I16
Junction block 1 (behind left kick panel)
Left door lock/ unlock motor & door detection position switch
Manual sw
Mry
Msw
N0. 1
N0. 2
Nca
P (pkb)
Park/neutral position switch (on transmission)
Pnk
Power fuse 30a
Red
Relay block 2 (on left side of engine compt, behind battery)
Remote control mirror ecu (behind left center of dash)
Set
Ssr-
T10
Telesco long
Telesco short
Telescopic control motor
Telescopic position sensor
Telescopic position sensor (behind left side of dash)
Tem+
Tem-
Tes
Tilt & power telescopic ecu (behind left side of dash)
Tilt & power telescopic unit (combination switch)
Tilt control motor
Tilt down
Tilt position sensor
Tilt up
Tim+
Tim-
Tis
Unlock warning switch (ignition switch)
Uwsw

Memory Seats Wiring Diagram (1 of 2) for Lexus SC 400 1998

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List of elements for Memory Seats Wiring Diagram (1 of 2) for Lexus SC 400 1998:

(body harness, under left front seat)
(dash harn, left end of dash) i1
(dash harness, (upper left end of dash)
(or red)
+b2
B10
B9 (body harn, below left front seat)
C10
Door fuse 30a
Down
Driver's front vertical motor (under seat)
Driver's power seat control switch
Driver's rear vertical motor (under seat)
Driver's slide control motor (under seat)
Driving position memory/ return switch
Dsw
Ecu-ig fuse 15a
Ecue
Fdwn
Front
Front vertical
Frv+
Frv-
Fup
G309 (rear of left door sill)
Gnd
Gnd2
Hot at all times
Hot in start or on
I10
Junction block 1 (behind left kick panel)
Left door open detection switch
Lumbar support
Lumbar support motor (under left seat)
Mry
Nca
P13
P14
Pnk
Power seat ecu (under driver's seat)
Pvcc
Rcl+
Rcl-
Rclf
Rclr
Rdwn
Rear
Reclining
Red
Rrv+
Rrv-
Rup
Set
Shield
Sld+
Sld-
Sldf
Sldr
Slide
Ssfv
Ssr-
Ssrr
Ssrs
Ssrv
Stop
Stop fuse 15a
Stoplight switch (on bracket, above brake pedal)
Sysb
Tilt/ power telescopic ecu (behind left side of dash)
Vertical rear

Memory Seats Wiring Diagram (2 of 2) for Lexus SC 400 1998

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List of elements for Memory Seats Wiring Diagram (2 of 2) for Lexus SC 400 1998:

(body harn, left side of left front seat back)
(body harness, top of left seat back)
B10
B11
B13
B13 (body harness, top of left seat back)
Dome fuse 10a
Down
Driver's power seat reclining motor control (under driver's seat)
Front
Front vertical motor (under right seat)
Front vertical position sensor (under driver's seat)
Front verticle
G302 (under left side of ashtray)
G316 (rear of right door sill)
Gauge fuse 10a
Gnd
H10
H12
Hold
Hot at all times
Hot in on or start
Junction block 1 (behind left kick panel)
Lumbar support
Lumbar support motor (under right seat)
P15
Park/ neutral position switch
Passenger's power seat control switch
Passenger's reclining limit switch (under seat)
Passenger's seat ecu (under passenger's seat)
Passenger's seat slide limit switch (under seat)
Passenger's seat slide motor (under right seat)
Passenger's seat slide position sensor (under seat)
Passenger's seatbelt buckle switch (in buckle)
Passenger's tension reducer solenoid
Pbcl
Pvcc
Rear
Rear vertical motor (under right seat)
Rear vertical position sensor (under driver's seat)
Rear verticle
Reclining
Reclining motor (under right seat)
Red
Relay block 2 (on left side of engine comp, behind battery)
Release
Rfsw
Rrsw
Sgnd
Sld+
Sld-
Sldf
Sldr
Slide
Slide position sensor (under driver's seat)
Slsw
Ssrs
Sysb

PASSIVE RESTRAINTS

Electric Tension Reducer Wiring Diagram for Lexus SC 400 1998

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List of elements for Electric Tension Reducer Wiring Diagram for Lexus SC 400 1998:

Ecu-ig fuse 15a
G305 (below right "b" pillar)
G308 (below left "b" pillar)
Hot in start or on
J/b 1 (left kick panel)
Left buckle switch (inside driver's seat belt buckle head)
Left tension reducer solenoid (below left "b" pillar)
Passenger's power seat ecu (under passenger's seat)
Right buckle switch (inside passenger's seat belt buckle head)
Right tension reducer solenoid (below right "b" pillar)
Tension reducer diode (left kick panel)

POWER ANTENNA

Power Antenna Wiring Diagram for Lexus SC 400 1998

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List of elements for Power Antenna Wiring Diagram for Lexus SC 400 1998:

(dash harn, behind radio)
(nakamichi)
(nakamichi) i33
(pioneer)
(pioneer) i32
Acc
Ant+b
Anta
Antb
Auto antenna control relay
Auto antenna motor
Auto antenna motor & relay (at left side of luggage compartment)
Down
E10
Ecu-ig fuse 15a
G407 (center rear of trunk)
Gnd
Hot at all times
Hot in acc or on
Hot in start or on
Junction block 1 (behind left kick panel)
R20
Radio & player
Radio 1 fuse 20a
Radio 2 fuse 7.5a
Red
Relay block 2 (on left side of engine compt, behind battery)
Sensor
Sgnd
Sig
Solid state
Svcc

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 3) for Lexus SC 400 1998

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List of elements for Power Distribution Wiring Diagram (1 of 3) for Lexus SC 400 1998:

(3.0l)
(3.0l) (4.0l)
(4.0l)
(engine harness, left side of eng compt) e10
Abs motor relay, abs solenoid relay
Abs n0. 1 fuse 60a
Acc
Alt fuse 120a 150a
Am1
Am1 fuse 100a
Am2
Am2 fuse 30a
Battery
C13
D11
Data link connector 3
Dome fuse 10a
E10
Engine control module, park/neutral position switch, clutch start switch
Fog fuse 15a
Fog light relay
Generator
Haz-horn fuse 15a
Horn relay, hazard switch, theft deterrent horn
I3 (dash harn, upper left end of dash)
Ig sw fuse 40a
Ig1
Ig2
Ignition main relay
Ignition switch
Inj fuse 30a
Integration relay
Integration relay,
Junction block 1 (behind left kick panel)
Lock
Main fuse 60a
Nca
Obd ii fuse 7.5a
Rad 2 fuse 7.5a
Radio & player, auto antenna motor & relay, woofer speaker amplifier, stereo power amplifier
Radio 1 fuse 20a
Red
Relay block 2 (on left side of engine compt, behind battery)
Relay block 4 (behind left kick panel, on front side of junction block 1)
Remote control mirror ecu
Remote control mirror switch
Seat heater switch
St fuse 7.5a
St-htr fuse 15a
St1
Start
Theft deterrent & door lock ecu, wireless door lock ecu, cruise control ecu, passenger power seat ecu, driver's power seat ecu, tilt & power telescopic ecu, door courtesy lights, vanity lights, ignition key cylinder light, step light, personal light, luggage compartment light, combination meter, a/c control assembly
To cig fuse, junction block 1 (diagram 2 of 3)
To def fuse, relay block 2 (diagram 3 of 3)
To door fuse, junction block 1 (digram 2 of 3)
To efi fuse relay block 2 (diagram 3 of 3)
To gauge fuse, junction block 1 (diagram 2 of 3)
To ign fuse, junction block 1 (diagram 2 of 3)
Woofer speaker amplifier, stereo power amplifier, radio & player, auto antenna motor & relay

Power Distribution Wiring Diagram (2 of 3) for Lexus SC 400 1998

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List of elements for Power Distribution Wiring Diagram (2 of 3) for Lexus SC 400 1998:

(behind left kick panel) junction block 1
15a
7.5a
A/c control assembly, shift lock ecu
A12
C16
Cig fuse
Cigarette lighter
Combination meter, airbag sensor assembly, engine control module
Combination meter, automatic light control sensor, remote control mirror ecu
Diode
Door fuse 30a
Driver's seat control switch, passenger's seat control switch, driver's power seat ecu, passenger's power seat ecu, theft deterrent & door lock ecu, fuel lid opener switch
E12
E13
E17
Ecu-b fuse 15a
Ecu-ig fuse 15a
Engine control module, license lights, light failure sensor
Engine controls system
Engine fuse 7.5a
From am1 fuse (diagram 1 of 3)
From ignition switch (diagram 1 of 3)
From ignition switch, (diagram 1 of 3)
From rad 2 fuse, junction block 1 (diagram 1 of 3)
G10
G200 (left kick panel)
Gauge fuse 10a
Generator
H10
H12
H15
H16
Hazard switch
Heater relay, a/c magnetic clutch relay, defogger relay, a/c control assembly, water valve vsv
Htr fuse 10a
I10
I14
I21 (dash harn, lower right end of dash)
Ign fuse
Integration relay
Interior lights system
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
K10
K13
Panel fuse 7.5a
Parking lights, front side marker lights
Power main relay
Pwr fuse 30a
Stop fuse 15a
Stop light switch
Tail fuse 7.5a
Taillight relay
Telephone transceiver & speaker relay, auto antenna & motor relay, driver power seat ecu, tension reducer solenoids, theft deterrent & door lock ecu, cruise control ecu, tilt & power telescopic ecu. inner mirror, ignition main relay, mobile phone, throttle driver, abs ecu, abs & traction ecu, pps ecu, cooling fan ecu, shift lock ecu, automatic light control sensor
Theft deterrent & door lock ecu, airbag sensor assembly
Tilt & power telescopic ecu, moon roof control relay
Turn fuse 7.5a
Vehicle speed sensor 1, back-up light switch (m/t), park/neutral position switch (a/t), cruise control clutch switch (m/t), light failure sensor, wireless door lock ecu, electronic controlled transmission pattern select switch, combination meter, trip switch and theft deterrent indicator light
Washer motor, wiper/washer switch, wiper motor
Wiper fuse 20a

Power Distribution Wiring Diagram (3 of 3) for Lexus SC 400 1998

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List of elements for Power Distribution Wiring Diagram (3 of 3) for Lexus SC 400 1998:

(digram 1 of 3)
Alt sensing fuse 7.5a
Def fuse 50a
Defogger relay
Dimmer relay (4.0l)
E10 (engine harness, left fender apron)
Efi fuse 30a
Efi main relay
Engine control module
Fog light relay, left low beam headlight, left hi beam headlight (3.0l)
From alt fuse, fuse block (diagram 1 of 3)
From haz-horn fuse relay block 2 f
From tel fuse, relay block 2 (diagram 3 of 3)
Generator
Head (lh-upr) fuse 15a
Head (rh-upr) fuse 15a
Headlight relay
Heater relay
Htr fuse 60a
Junction block 1 (behind left kick panel)
Left and right mirror heater, idle-up diode
Left head fuse (3.0l) left lower head fuse (4.0l) 15a
Left hi beam headlight
Mir-htr fuse 10a
Rear defogger
Red
Relay block 2 (on left side of engine compt, behind battery)
Right head fuse (3.0l) right lower head fuse (4.0l) 15a
Right hi beam headlight, combination meter
Right low beam headlight, combination meter (usa sc 300), right hi beam headlight (3.0l)
Starter
Starter relay
Tel fuse 15a
Telephone transceiver & speaker relay
Throttle driver
To headlight relay, relay block 2 (diagram 3 of 3)
Trac fuse 7.5a

POWER DOOR LOCKS

Keyless Entry & Anti-Theft Wiring Diagram (1 of 2) for Lexus SC 400 1998

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List of elements for Keyless Entry & Anti-Theft Wiring Diagram (1 of 2) for Lexus SC 400 1998:

(above base of right b-pillar) wireless door lock control ecu
(body harn, left rear wheelwell)
(dash harn, lower right end of dash)
(dash harn, top center of dash)
(dash harn, top center of dash) i14
(dash harn, upper left side of dash)
(dash harn, upper right side of dash)
(rear of right door sill) g316
Acc
Act+
Act-
Actd
B1+
B18
B22
Bzr
Bzr2
Cig fuse 15a
Cty
Diode
Dome fuse 10a
Door fuse 30a
Dswd
Dswh
Dswl
Dswp
Ecu-ig fuse 15a
Engine hood courtesy switch (center front of engine compartment)
G101 (right front fender)
G200 (left kick panel)
Gauge fuse 10a
Grd
H10
Head
Headlights system
Horn
Horn relay
Hot at all times
Hot in run
Hot in run or accy
Hot in run or start
I14
I14 (dash harn, top center of dash)
I16
I22
I22 (dash harn, lower right end of dash)
Ind
Integration relay
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
K13
Ksw
Left front door key lock/unlock switch
Lock
Lswd
Lswp
Lug
Luggage compartment light switch (center rear of trunk)
Master power window/door lock control switch
Of dash)
Pnk
Power circuit breaker 30a
Power main relay
Prly
Red
Relay block 2 (on left side of engine compt, behind battery)
Right front door key lock/unlock switch
Right front door lock control switch
Srly
Starter relay
Tail
Taillight relay
Theft deterrent & door lock ecu (behind instrument cluster)
Tsw
Ul1
Ul2
Ul3
Unlock
Wireless door lock buzzer (at left side of engine compartment, near strut tower)

Keyless Entry & Anti-Theft Wiring Diagram (2 of 2) for Lexus SC 400 1998

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List of elements for Keyless Entry & Anti-Theft Wiring Diagram (2 of 2) for Lexus SC 400 1998:

(dash harn, top center of dash) i14
B15
Combination meter
D10
G200 (left kick panel)
G203 (right kick panel)
G407 (center rear of trunk)
H13
Haz-horn fuse 15a
Horn relay
Hot at all times
I2 (dash harn, left end of dash)
Junction block 1 (behind left kick panel)
Left lock/ unlock motor and door detection position switch
Luggage comparment door opener motor (center rear of trunk)
Luggage compartment door open switch
Luggage compartment key unlock switch (right rear of trunk)
Pnk
Red
Relay block 2 (on left side of engine compt, behind battery)
Right lock/ unlock motor and door detection position switch
Theft deterrent horn (left rear of eng compt)
Trip switch and theft deterrent indicator switch
Unlock warning switch (ignition switch)

POWER MIRRORS

Electrochromic Mirrors Wiring Diagram for Lexus SC 400 1998

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List of elements for Electrochromic Mirrors Wiring Diagram for Lexus SC 400 1998:

Ecu-ig fuse 15a
G200 (left kick panel)
Hot in on or start
I3 (dash harn, upper left end of dash)
Inner mirror
Junction block 1 (behind left kick panel)
Left remote control mirror
Red
Right remote control mirror
W/ memory

POWER SEATS

Heated Seats Wiring Diagram for Lexus SC 400 1998

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List of elements for Heated Seats Wiring Diagram for Lexus SC 400 1998:

Am1 fusible link 100a
Driver's seat heater (in seat back)
Driver's seat heater (in seat cushion)
E10 (engine harn, left fender apron)
E18
Ecu-ig fuse 15a
Front passenger's seat heater (in seat back)
Front passenger's seat heater (in seat cushion)
Fuse block (at left side of engine compt, behind battery)
G200 (left kick panel)
G309 (rear of left door sill)
G316 (rear of right door sill)
Hot at all times
Hot in on or start
I2 (dash harn, left end of dash)
I3 (dash harn, upper left end of dash)
Ignition main relay
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Left
Relay block 4 (behind left kick panel, on front side of junction block)
Right
Seat heater switch
Seat-htr fuse 15a

POWER TOP/SUNROOF

Power Top/Sunroof Wiring Diagrams for Lexus SC 400 1998

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List of elements for Power Top/Sunroof Wiring Diagrams for Lexus SC 400 1998:

15a
30a
B16 (body harness, center of windshield header)
B6 (body harness, left "a" pillar)
Close
D10
Dome fuse 10a
Door fuse
Door open detection switch lh
Door open detection switch rh
Down
Ecu-ig fuse
G200 (left kick panel)
G203 (right kick panel)
Gnd
H10
H15
Hot at all times
Hot in on or start
I16
Is1
Is2
Junction block 1 (behind left kick panel)
K13
Moon roof control relay (in front of moon roof opening)
Moon roof control switch
Moon roof motor & limit switch (in front of moon roof opening)
Mtr+
Mtr-
No. 1
No. 2
Open
Pnk
Power fuse
Power main relay
Red
Relay block 2 (on left side of engine compt, behind battery)
Theft deterrent & door lock control ecu (behind instrument cluster)

POWER WINDOWS

Power Window Wiring Diagram for Lexus SC 400 1998

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List of elements for Power Window Wiring Diagram for Lexus SC 400 1998:

(at left kick panel)
Auto
Auto down module
B1 (door harness, in left front door)
B15
D10
Dome fuse 10a
Door fusible link 30a
Down
Ecu-ig fuse 15a
G200 (at left kick panel)
G203 (right kick panel)
H10
Hot at all times
Hot in on or start
I16
J/b 1
J/b 1 (at left kick panel)
K13
Left door open detection switch
Left front
Left power window motor
Lock switch
Power fusible link 30a
Power main relay
Power window master switch
R/b 2 (left side of engine compartment)
Red
Right door open detection switch
Right front
Right power window control switch
Right power window motor
Theft deterrent and door lock control ecu (behind instrument cluster)

RADIO

Base Radio, without CD Changer for Lexus SC 400 1998

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List of elements for Base Radio, without CD Changer for Lexus SC 400 1998:

(center back panel) g407
(console box harness, under front end of center console) i32
(console box harness, under front end of center console) i33
(floor 3 harness, under rear seat) b20
(under right ashtray) g302
A/c control switch & radio switch
A10
A12
Acc
Amp
Ant
Anta
Antb
Aud+
Aud-
Auto antenna motor & relay (at left side of luggage compartment)
B12
B12 (floor 3 harness, under center console)
C10
E10
Ecu-ig fuse 15a
Fl+
Fl-
Fr+
Fr-
Hot at all times
Hot in acc or on
Hot in on or start
I33 (console box harness, under front end of center console)
Illumination
Interior lights system
J/b 1 (behind left kick panel)
Left front door speaker
Left rear speaker
Mute
Pnk
Pwr
R/b 2 (on left side of engine compartment, behind battery)
Radio & player
Radio 1 fuse 20a
Radio 2 fuse 7.5a
Red
Right front door speaker
Right rear speaker
Rl+
Rl-
Rr+
Rr-
Ru+
Ru-
Sgnd
Shield
Sp+
Sp-
Speaker relay
Telephone transceiver
Telephone transceiver & speaker relay (at left rear corner of luggage compartment)
Tlmt
Vol+
Volc
Woofer speaker (right side of rear shelf)
Woofer speaker amplifier (at right side of luggage compartment)
Wp+
Wp-

with CD Changer, Nakamichi for Lexus SC 400 1998

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List of elements for with CD Changer, Nakamichi for Lexus SC 400 1998:

(console box harness, under front end of center console) i33
(floor 3 harness, right side of luggage compartment) b29
(floor 3 harness, under rear seat) b20
(under right ashtray) g302
A/c control switch & radio switch
A10
A11
A12
A13
A14
Acc
Amp
Ant
Anta
Antb
Aud+
Aud-
Automatic cd changer
B10
B12
B29 (floor 3 harness, right side of luggage compartment)
B30 (floor 3 harness, right side of luggage compartment)
Beep
C10
C11
C12
C13
C14
C15
Cd player
Cdl+
Cdl-
Cdr+
Cdr-
D10
D11
D12
E10
Fl+
Fl-
Fr+
Fr-
Gnd
Hot at all times
Hot in acc or on
I34 (console box harness, under front end of center console)
Illumination
Interior lights system
J/b 1 (behind left kick panel)
Left front door speaker
Left rear speaker
Luggage compartment light switch
Mute
Pnk
Power antenna system
Pwr
R/b 2 (on left side of engine compartment, behind battery)
Radio & cd player
Radio 1 fuse 20a
Radio 2 fuse 7.5a
Red
Right front door speaker
Right rear speaker
Rl+
Rl-
Rr+
Rr-
Sgn1
Sgnd
Shield
Sp+
Sp-
Speaker relay
Stereo power amplifier (at right side of luggage compartment)
Telephone transceiver
Telephone transceiver & speaker relay (at left rear corner of luggage compartment)
Tlmt
Txm+
Txm-
Txs+
Txs-
Under rear seat)
Vol+
Volc
Wf+
Wf-
Woofer speaker (right side of rear shelf)
Woofer speaker amplifier (at right side of luggage compartment)

with CD Changer, Pioneer for Lexus SC 400 1998

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List of elements for with CD Changer, Pioneer for Lexus SC 400 1998:

(console box harness, under front end of center console) i33
(console box harness, under front end of center console) i34
(floor 3 harness, right front of luggage compartment) b28
(floor 3 harness, under rear seat) b20
(under right ashtray) g302
A/c control switch & radio switch
A10
A11
A12
A13
A14
Acc
Amp
Ant
Anta
Antb
Aud+
Aud-
Automatic cd changer
B10
B12
B12 (floor 3 harness, under center console)
B20
B23 (floor 3 harness, at base of right rear windshield)
B30 (floor 3 harness, right side of luggage compartment)
Beep
C10
C11
C12
C13
C14
C15
Cd player
Cdl+
Cdl-
Cdr+
Cdr-
D10
D11
D12
E10
Fl+
Fl-
Floor 3 harness, under rear seat)
Fr+
Fr-
Gnd
Hot at all times
Hot in acc or on
I34 (console box harness, under front end of center console)
Illumination
Interior lights system
J/b 1 (behind left kick panel)
Left front door speaker
Left rear speaker
Luggage compartment light switch
Mute
Pnk
Power antenna system
Pwr
R/b 2 (on left side of engine compartment, behind battery)
Radio & cd player
Radio 1 fuse 20a
Radio 2 fuse 7.5a
Red
Right front door speaker
Right rear speaker
Rl+
Rl-
Rr+
Rr-
Ru+
Ru-
Sgn1
Sgnd
Shield
Sp+
Sp-
Speaker relay
Stereo power amplifier (at right side of luggage compartment)
Telephone transceiver
Telephone transceiver & speaker relay (at left rear corner of luggage compartment)
Tlmt
Txm+
Txm-
Txs+
Txs-
Vol+
Volc
Wf+
Wf-
Woofer speaker (right side of rear shelf)
Woofer speaker amplifier (at right side of luggage compartment)

SHIFT INTERLOCKS

Shift Interlock Wiring Diagram for Lexus SC 400 1998

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List of elements for Shift Interlock Wiring Diagram for Lexus SC 400 1998:

(left kick panel)
10a
15a
Acc
Cig fuse
Doff
E17
E18
E20
Ecu-ig fuse
Engine controls system
G200
Gauge fuse
H12
H13
H15
Hot at all times
Hot in acc or run
Hot in run or start
I10
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Key interlock solenoid (integral to ignition switch)
Kls+
Park/neutral position switch (on transmission)
Shift lock control switch
Shift lock ecu & transmission control switch (under center console near selector lever)
Shift lock solenoid
Sls+
Sls-
Stop fuse
Stop light switch (on bracket) above brake pedal)
Stp
Transmission system

STARTING/CHARGING

4.0L

4.0L, Starting Wiring Diagram for Lexus SC 400 1998

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List of elements for 4.0L, Starting Wiring Diagram for Lexus SC 400 1998:

(on transmission)
Acc
Alt fusible link 150a
Am1
Am1 fusible link 100a
Battery
E18
Engine control module (behind lower right side of dash)
Fuse block (at left side of engine compartment, behind battery)
I27 (dash harness, right side of dash)
Ignition switch
Igsw fuse 40a
Instrument cluster system
Junction block 1 (behind left kick panel)
Lock
Main fusible link 60a
Nca
Park/ neutral position switch
Relay block 2 (on left side of engine compt, behind battery)
Run
Srly
St fuse 7.5a
St1
Sta
Start
Starter motor
Starter relay
Theft deterrent & door lock control ecu (behind instrument cluster)

Charging Wiring Diagram for Lexus SC 400 1998

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List of elements for Charging Wiring Diagram for Lexus SC 400 1998:

(2000)
(3.0l) (4.0l)
3.0l
4.0l
Alt fusible link 120a 150a
Alt sensing fuse 7.5a
Battery
C14
Charging warning light
Combination meter
Engine fuse 7.5a
Fuse block (at left side of engine compt, behind battery)
Generator
Hot in run or start
Ign fuse 7.5a
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
Main fusible link 60a
Nca
Relay block 2 (on left of engine compt, behind battery)
Starting circuit

SUPPLEMENTAL RESTRAINTS

Supplemental Restraint Wiring Diagram for Lexus SC 400 1998

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List of elements for Supplemental Restraint Wiring Diagram for Lexus SC 400 1998:

Acc
Airbag ind
Airbag sensor assembly (behind center of dash, forward of center console)
Airbag squib (front passenger's airbag assembly)
Airbag squib (steering wheel pad)
Cig fuse 15a
Combination meter
D11
Data link connector 1 (left side of engine)
Data link connector 2 (behind left side of dash)
E10
E13
Ecu-b fuse 15a
G10
G200 (behind left kick panel)
H12
Hot at all times
Hot in on or acc
Hot in on or start
Ig2
Ign fuse 7.5a
J/b 1 (behind left kick panel)
J/b 3 (behind center of dash)
Red

TRANSMISSION

A/T Wiring Diagram for Lexus SC 400 1998

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List of elements for A/T Wiring Diagram for Lexus SC 400 1998:

(dash harn, right side of dash)
(engine harn, left rear of engine)
(engine harn, right side of firewall)
(front side of left fender) g100
(left rear side of cyl head) g114
+b1
2 ind
3 ind
4 ind
A/t indicator switch (park/neutral position switch (on top left side of transmission)
A/t oil
Accelerator position sensor (right rear of engine)
Batt
D ind
E01
E02
E03
E15
E16
E17
E18
E19
E20
E26
E29
Efi fuse 30a
Efi main relay
Electronically controlled transmission pattern select switch
Electronically controlled transmission solenoid (in transmission)
Engine control module (behind right side of dash)
Engine controls (combination meter)
Engine coolant temperature sensor (right front of engine)
G206 (left instrument panel brace)
Gauge fuse 10a
H12
Hot at all times
Hot in on or start
I10
I25
I27
I27 (dash harn, right side of dash)
I9 (dash harn, top center of dash)
Ign fuse 7.5a
Igsw
Instrument panel j/b (left side of dash)
Junction block 1 (behind left kick panel)
Junction block 3 (behind center of dash)
L ind
Mrel
N ind
Nco+
Nco-
No. 1
No. 2
No. 3
No. 4
O/d direct clutch speed sensor (on trans- mission)
Oil
P ind
Pnk
Pwr
Pwr ind
Pwrl
R ind
R n
R/b 2 (left side of engine compt)
Red
Sln
Sln+
Sln- sln-
Slt
Slt+
Slt-
Slu
Slu+
Slu-
Snow ind
Snwi
Snwl
Sp2+
Sp2-
Starting/ charging system
Stop fuse 15a
Stoplight switch (on brake pedal bracket)
Stp
Temp
Throttle position sensor (on throttle body)
Thw
Transmission control switch (2 - l) (near gear selector)
Transmission control switch (d - 4) (near gear selector)
Vehicle speed sensor (on trans- mission)
Vpa
Vpa2
Vta
Vta2