Diagram sections — 32 (57 total)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT COMPUTER DATA LINES COOLING FAN CRUISE CONTROL DEFOGGERS ELECTRONIC POWER STEERING ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS MEMORY SYSTEMS PASSIVE RESTRAINTS POWER ANTENNA POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER TOP/SUNROOF POWER WINDOWS RADIO SHIFT INTERLOCKS STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION TRUNK, TAILGATE, FUEL DOOR WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING Air Conditioning Wiring Diagrams (1 of 2) for Lexus SC 400 1997 List of elements for Air Conditioning Wiring Diagrams (1 of 2) for Lexus SC 400 1997: 60 (i/p harness, behind center of i/p) (i/p harness, behind glove box) (i/p harness, behind right side of i/p) (sc300) (sc400) 1994 vftc c A/c A/c control assembly (center of i/p) A/c dual pressure switch (right side of engine compt) A/c in A/c solar sensor (right side of i/p) Acc Air inlet control servo motor (center of i/p) Air mix control servo motor (center of i/p) Air vent mode control servo motor (center of i/p) Amout Blr Conn "a" Conn "b" Conn "c" Cool Defogger system Engine control module (center of i/p) G101 (right front fender) G200 (left kick panel) G203 (right kick panel) I26 I31 I36 Ig+ Ign Igniter (left side of engine compt) Instrument cluster system Instrument cluster system (trip meter) Interior lights system (rheostat) J/b 3 (behind center of i/p) Lock in Mdef Mface Mfrs Mgc Mrec Pnk Rdfgr Red Reost Saut Set1 Set2 Set3 Set4 Set5 Spd Tail Tam Tel in Telephone transceiver & speaker relay (left rear of trunk) Tpi Tpm Ver Air Conditioning Wiring Diagrams (2 of 2) for Lexus SC 400 1997 List of elements for Air Conditioning Wiring Diagrams (2 of 2) for Lexus SC 400 1997: 54 (center of i/p) (eng harn, right rear of eng compt) (sc400) (eng harn, left side of eng) (sc300) (engine harness, left side of eng compt) (i/p harn, (behind right side of i/p) i25 (i/p harn, behind center of i/p) (i/p harn, behind glove box) (left front of engine compt) (right side of engine compt) (sc400) 1994 vftc c A/c ambient temperature sensor (right front of engine compt) A/c control switch & radio switch A/c evaporator temperature sensor (center of i/p) A/c lock sensor (left front of engine) A/c magnetic clutch (left side of engine) A/c magnetic clutch relay A/c room temperature sensor (center of i/p) A/c single pressure switch Acmg Blower motor Blower motor control relay (center of i/p) Cig fuse 15a Cooling fan ecu Data link connector 1 (left side of engine) Def relay Dome fuse 10a E10 E16 (sc400) e20 (sc300) Ecu-ig fuse 15a Engine control module (center of i/p) Engine controls system Engine coolant temperature sensor Engine coolant temperature sensor (center of i/p) G100 (front left fender) G101 (right front fender) G203 (right kick panel) Heater fuse 10a Heater fusible link 60a Heater relay Hot at all times Hot at all times r/b 2 (left side of engine compt) Hot in accy, run or start Hot in run or start Hot w/ lights in tail or head I21 I32 J/b 1 (left kick panel) J/b 3 (behind center of i/p) Panel fuse 7.5a R/b 2 (left side of engine compt) Radio temp control switch Red Solenoid valve (left front of engine) (sc400) Vsv (right rear of engine compt)
ANTI-LOCK BRAKES Anti-lock Brake Wiring Diagrams, with Traction Control (1 of 2) for Lexus SC 400 1997 List of elements for Anti-lock Brake Wiring Diagrams, with Traction Control (1 of 2) for Lexus SC 400 1997: 58 (i/p harn, behind center of dash) (i/p harn, right side of dash) A20 A22 A4/12 pnk Abs 1 fusible link 60a Abs actuator (right rear of engine compartment) Abs and traction ecu (behind glove box) Abs motor relay Abs sol relay Ast D/g Data link connector 1 (top left side of engine) Data link connector 2 (left kick panel) E9 (eng room harness, left shock tower) Fl+ Fl- Fr+ Fr- Fuse box (left side of eng compt) G100 (front of left front fender) G101 (front side of right fender) G203 (right kick panel) Gnd1 Gnd2 Gnd3 Gnd4 H13 Hot at all times I20 I21 (i/p harn, right kick panel) I23 I24 I27 Ind J/b 3 (behind combi- nation h12 Left front abs speed sensor (behind left front wheel disk) Left rear abs speed sensor (behind left rear wheel disk) Meter) Nca Pnk R/b 6 (left side of engine compt) Red Right front abs speed sensor (behind right front wheel disk) Right rear abs speed sensor (behind right rear wheel disk) Sflh Sflr Sfrh Sfrr Smc Spc Src Srlh Srlr Srrh Srrr Trc+ Trc- Anti-lock Brake Wiring Diagrams, with Traction Control (2 of 2) for Lexus SC 400 1997 List of elements for Anti-lock Brake Wiring Diagrams, with Traction Control (2 of 2) for Lexus SC 400 1997: 72 (sc 300) (sc 400) A21 Abs Abs and traction ecu (behind right side of dash) Acm Bcm Brake fluid level switch (in brake fluid reservoir) C12 C25 Combination meter Csw D13 Diode E11 Ecu-ig fuse 15a Efi+ Efi- Engine control module (behind right side of dash) Engine controls system Except m/t w/ driving position memory G200 (left kick panel) G203 (right kick panel) Gauge fuse 10a Gnd H14 Hot at all times Hot in run I10 I12 I21 I21 (i/p harn, behind right side of dash) I27 (i/p harn, right side nca of dash) I29 (i/p harn, behind right side of dash) Idl2 Ig1 J/b 1 (left kick panel) J/b 3 (behind i/p) J/c 1 (behind center of dash) Lbl+ Lbl- M/t w/ driving position memory Nca Neo Parking brake switch (on parking brake support) Pnk R/b 2 (left side of engine compt) R/b 4 (left kick panel) Red Rl+ Rl- Rr+ Rr- Sgnd Smsg Stop fuse 15a Stop light switch (on brake pedal support) Stp Stp, bk Sub throttle actuator (on throttle body) T12 T13 Tcr- Thd Thdo Throttle driver (behind right side of dash) Tra Trac Trac fuse 7.5a Trac off Traction cut switch Trc+ Anti-lock Brake Wiring Diagrams, without Traction Control for Lexus SC 400 1997 List of elements for Anti-lock Brake Wiring Diagrams, without Traction Control for Lexus SC 400 1997: 66 (i/p harn, right kick panel) (i/p harness, right kick panel) A23 A24 Abs 1 fusible link 60a Abs actuator (right rear of eng compt) Abs ecu (right side of dash) Abs indicator Abs motor relay Abs sol relay Ast C12 C25 Combination meter D/g D13 Data link connector 1 (top center of engine) Data link connector 2 (behind left side of i/p) E11 (eng rm harn, left side of eng compt) E12 E20 E9 (engine rm harness, left side of engine compt) Ecu-ig fuse 15a Fl+ Fl- Fr+ Fr- Fuse box (left side of engine compartment) G100 (front side of left fender) 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 I21 I23 I24 Ig1 J/b 1 (left kick panel) J/b 3 (behind combination meter) J/b 3 (behind i/p) Left front abs speed sensor (behind left front wheel disk) Left rear abs speed sensor (behind left rear wheel disk) R/b 6 (left side of engine compt) Red Right front abs speed sensor (behind right front wheel disk) Right rear abs speed sensor (behind right rear wheel disk) Rl+ Rl- Rr+ Rr- Sflh Sflr Sfrh Sfrr Srh Srr Stop fuse 15a Stop light switch (mounted on brake pedal support) Stp
ANTI-THEFT Anti-theft Wiring Diagram (1 of 2) for Lexus SC 400 1997 List of elements for Anti-theft Wiring Diagram (1 of 2) for Lexus SC 400 1997: 74 (body harness, left rear door sill) (i/p harn, left side of i/p) (i/p harness, left side of i/p) (i/p harness, right side of i/p) Acc Act+ Act- Actd B1+ B18 Bzr Bzr2 Cig fuse 15a Cty Diode (in r/b 4) 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) G305 (below right "b" pillar) Gauge fuse 10a Grd H10 Head Headlight relay Horn Horn relay Hot at all times Hot in run Hot in run or accy Hot in run or start I14 I16 I22 Ind Integration relay J/b 1 (left side of i/p) J/b 2 (left side of engine compt) J/b 3 (behind cluster) 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 Pnk Power circuit breaker 30a Power main relay Prly Red Right front door key lock/unlock switch Right front door lock control switch Srly Starter relay Tail Taillight relay Theft deterrent and door lock ecu (left side of i/p) Tsw Ul1 Ul2 Ul3 Ulsw Unlock Wireless door lock buzzer (left side of eng compt) Wireless door lock ecu (right rear of trunk) Anti-theft Wiring Diagram (2 of 2) for Lexus SC 400 1997 List of elements for Anti-theft Wiring Diagram (2 of 2) for Lexus SC 400 1997: 28 (behind left side of i/p) (i/p harness, center of i/p) i14 B15 C10 C15 D10 G200 (left kick panel) G203 (right kick panel) G302 (under left ashtray) G407 (center rear of trunk) H13 Haz-horn fuse 25a Horn relay Hot at all times I5 (i/p harness, left side of i/p) Instrument cluster J/b 1 J/b 2 (left side of engine comp) 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 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)
COMPUTER DATA LINES Computer Data Lines for Lexus SC 400 1997 List of elements for Computer Data Lines for Lexus SC 400 1997: 46 (engine harness, left side of engine) (left kick panel) (rear side of right cylinder head) g117 (sc 300) A/d A11 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 C25 Combination meter Cruise control ecu (behind left 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 E11 E16 (sc 400) e24 (sc 300) E18 Efi fuse 30a Efi main relay Engine control module (behind right side of dash) G110 (sc 300) (front side of intake manifold) G114 (sc 400) (left rear side of cylinder head) G117 (sc 400) (rear side of right cyl head) G200 H13 Hot at all times I18 I20 (i/p harness, right side of dash) J/b 1 (left kick panel) J/b 3 (behind combination meter) Obd ii fuse 7.5a R/b 2 (left side of eng compt) Sdl Te1 Trc
COOLING FAN Cooling Fan Wiring Diagram for Lexus SC 400 1997 List of elements for Cooling Fan Wiring Diagram for Lexus SC 400 1997: 19 1994 vftc c A/c control assembly (center of i/p) A/c single pressure switch (right side of engine compt) A11 Cooling fan ecu (center of i/p) Data link connector 1 (left side of eng compt) Ecu-ig fuse 15a Engine coolant temperature sensor (left front of engine compt) G101 (right front fender) G203 (right kick panel) Hot in run or start I16 I21 (i/p harn, right side of dash) I25 (engine harness, right side of i/p) Igniter (left side of engine compt) J/b 1 (left kick panel) Red Solenoid valve (left front of engine) Throttle position sensor (center of engine)
CRUISE CONTROL Cruise Control Wiring Diagram for Lexus SC 400 1997 List of elements for Cruise Control Wiring Diagram for Lexus SC 400 1997: 64 (i/p harness, left side of dash) i5 (i/p harness, right side of dash) (left instrument panel brace) g206 A/t Batt C14 C25 Cancel Ccs Cms Combination meter Cruise control actuator (front of right strut tower) Cruise control clutch switch (left side of dash) Cruise control ecu (behind left side of dash) Cruise control indicator Cruise control switch (combination switch) D13 Data link connector 1 (top left side of eng) Data link connector 2 (left side of dash) Dome fuse 10a E11 E12 E12,e14 Ect Ecu-ig fuse 15a Electronic control transmission solenoid Engine control module (right side of dash) Exterior lights system (stop light) G302 (under left ashtray) Gauge fuse 10a Gnd H10 H12 Hot at all times Hot in start or on I10 I25 I28 I9 (i/p harness, right side of daash) Idl Idl1 J/b 1 (left kick panel) J/b 3 (behind combination meter) K12 M/t Magnetic clutch Main Od1 Park/ neutral position switch (closed in "d") (top left of transmission) R/b 2 (left side of eng compt) Red Resume/ accel Set/ coast Sp1 Spd Speed meter Stop fuse 15a Stop light switch (on brake pedal support) Stp- Throttle position sensor Trip switch and theft deterrent indicator light Vehicle speed sensor 1 (on trans- mission) Vr1 Vr2
DEFOGGERS Defogger Wiring Diagram for Lexus SC 400 1997 List of elements for Defogger Wiring Diagram for Lexus SC 400 1997: 28 A10 A11 Def fuse 50a Defogger relay E10 (engine harness, left front fender) E18 G100 (front side of left fender) G200 (left kick panel) G203 (right kick panel) G302 (below right "b" pillar) Gnd Heater Hot at all times Htr fuse 10a J/b 1 (left kick panel) J/b 1 (left side of dash) J/b 3 (behind combination meter) Left remote control mirror Mir-htr fuse 10a Noise filter (left side of engine compt) R-def R/b 2 (left side of engine compartment) R13 R14 Rear window defogger Rear window defogger switch (a/c control assembly) Right remote control mirror W/ mem seat w/0 mem seat
ELECTRONIC POWER STEERING Progressive Power Steering Wiring Diagram for Lexus SC 400 1997 List of elements for Progressive Power Steering Wiring Diagram for Lexus SC 400 1997: 23 (right kick panel) (under left ashtray) C14 C25 Combination meter D13 E12 Ecu-ig fuse 15a G203 G302 Gauge gauge fuse fuse 10a 10a H12 h12 Hot in run Ig+ J/b 1 (left kick panel) J/b 3 (behind combination meter) Pps ecu (behind right side of dash) Pps solenoid (left front of engine compartment) Red Sol+ Sol- Spd Vehicle speed sensor no. 1 (on transmission)
ENGINE PERFORMANCE
4.0L 4.0L, Engine Performance Wiring Diagrams (1 of 3) for Lexus SC 400 1997 List of elements for 4.0L, Engine Performance Wiring Diagrams (1 of 3) for Lexus SC 400 1997: 150 center of i/p) #10 #10 #10 #20 #20 #20 #30 #30 #30 #40 #40 #40 #50 #60 #60 #60 #70 (eng harn, top right front of eng) (eng harn, top right front of engine) e25 (i/p harn behind glove box) (i/p harn, behind glove box) (i/p harn, behind top right dash) (left (left cyl head) (left cylinder head) (left side of engine compt) (left side of front fender) g100 (on (on trans- (rear of eng) (right (top left on eng) +b2 Acc Am1 Am2 Bk/wh Bu/rd Bu/rd bu/rd Camshaft position sensor 1 (left front of engine) Camshaft position sensor 2 (right front of engine) Conn e12 Crankshaft position sensor (lower left of engine) Cylinder Distributor E01 E02 E11 E11 (engine harness, top left center of engine) E12 E12 (engine harness, top center of firewall) E13 E13 (engine harness, top right center of engine) E16 E25 Efi fuse 30a Efi main relay Egr1 Egr2 Egr3 Engine control module (behind Evg Fuel injectors G1 g1 g1 G1- G115 G117 G2 g2 g2 G2- Head) Hot at all times Htl1 Htl4 Htr1 Htr2 Htl2 I13 I21 I25 I26 I28 I28 (i/p harn, behind center console) Idl1 Idl2 Idle air control valve (top center of engine) Igf Igf1 Igf2 Ign fuse 7.5a Igniter 1 Igniter 2 Ignition coil 1 (left front of eng) Ignition coil 2 (right front of engine) Ignition switch Igt Igt1 Igt2 Instrument cluster Instrument cluster system Isc1 isc1 Isc2 isc2 Isc3 isc3 Isc4 isc4 J/b 1 (left kick panel) Knk1 Knk2 Knock sensor 1 (left top of engine) Knock sensor 2 (right top of engine) Lock Mission) Nco Nco- Ne ne Ne- ne- Noise filter Note: splice locations e8 (engine harness, top of left front fender) Nsw O/d direct clutch speed sensor Oil On ig2 Oxl1 Oxl2 Oxr1 Oxr2 P/n Park/neutral position switch transmission) Pnk Pnk pnk Prg R/b 2 engine compt) Red Red red Red red red Short connector (center rear of engine compt) Sln+ Sln- Slu+ Slu- Sp2 Sp2- St fuse 7.5a St1 Sta Start Starter relay Starting system Stj Tach Tha Thg Thw Vc vc Vehicle speed sensor 2 Vf1 vf1 Vf2 vf2 Vta1 vta1 Vta2 vta2 W/o trac 4.0L, Engine Performance Wiring Diagrams (2 of 3) for Lexus SC 400 1997 List of elements for 4.0L, Engine Performance Wiring Diagrams (2 of 3) for Lexus SC 400 1997: 88 (behind (eng harn, front of fuse box) (eng harn, top left center of eng) (eng harn, top left rear of eng) (eng harn, top right center of dash) (i/p harn, bottom right of dash) (i/p harn, top center of dash) i17 (i/p harn, top right of dash) (i/p harness, top right of dash) (left (on (on transmission) (right side of engine) (under (under left center pillar) A/t indicator lights A10 Ashtray) B12 C2 c2 D10 D13 D13 d13 D14 E e E11 E12 E12 (eng harn, top center fire- wall) E13 E14 E15 E16 Egr valve (center rear of engine) Electronic controlled Electronic controlled transmission pattern select switch (on console) Engine compt) Evap valve (left rear of engine) Fp fp Fpc Fuel fuel pump pump ecu (under (under console) console) Fuel pressure up valve (center top of engine) Fuel pump Fuse block G302 Gauge fuse 10a H12 Hot at all times Hot in on or start I17 I19 I19 (i/p harness, top right of dash) I25 I26 I28 I29 I29 (i/p harness, bottom center of dash) I9 (i/p harness, top center of dash) Instrument cluster Interior J/b 1 (left J/b 3 center of i/p) Kick panel) Left Lights system Lock-up Main fuse 60a Malf. ind. lamp Norm O/d off ind. Oil temp. sensor Out Park/ neutral position switch (on trans- mission) Pnk pnk Power ind. Pwr Red Red red red Red/ Solenoids Solid state Speedometer Sub throttle position sensor Throttle position sensor Transmission Transmission) Vehicle speed sensor 1 Vss W/ traction control 4.0L, Engine Performance Wiring Diagrams (3 of 3) for Lexus SC 400 1997 List of elements for 4.0L, Engine Performance Wiring Diagrams (3 of 3) for Lexus SC 400 1997: 89 (behind (behind (behind (center rear (i/p harn, top center of dash) (left (left kick panel (right front of engine compt) A/c A/d Acmg Air Air conditioning system Anti-lock brakes system (traction ecu) Batt C13 Compt) Conditioning Conn e11 Control Cruise Cylinder D10 Data link connector 1 (center top of engine) Data link connector 2 (left side of dash) Data link connector 3 (left side of dash) E15 E16 Egr gas Els Engine control module (behind center of i/p) Engine coolant temperature sensor (right front of engine) Fpc G115 left G117 (right G200 (left kick panel) G200 g200 Head) Heated oxygen sensor (bank 1, sensor 1) (left exhaust manifold) Heated oxygen sensor (bank 1, sensor 2) (left exhaust manifold, after twc) Heated oxygen sensor (bank 2, sensor 1) (right exhaust manifold) Heated oxygen sensor (bank 2, sensor 2) (right exhaust manifold, after twc) Hot at all times Hot with tail lights on Ht1 Ht2 Htl2 Htr2 I10 I18 I25 I28 I35 Igsw J/b 1 J/b 3 (behind instrument cluster) J/b 3 instrument cluster) J/b 3 j/b 3 instrument cluster) instrument cluster) K10 Kick panel) kick panel) M-rel Mass air flow meter Neo O/d main switch Obdii fuse 7.5a Od1 Od2 Of engine Oxl1 Oxl2 Oxr1 Oxr2 Pim Pnk Ptnk Red Sdl Sensor Spd Stop fuse 15a Stop light switch (on brake pedal support) Stp System Tail fuse 7.5a Te1 Temperature Tpc Vapor pressure sensor (right front of engine compartment) Vto1 Vto2
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Lexus SC 400 1997 List of elements for Back-up Lamps Wiring Diagram for Lexus SC 400 1997: 12 (a/t) (m/t) (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 J/b 1 (left kick panel) Left rear combination light Right rear combination light Exterior Lamps Wiring Diagram (1 of 2) for Lexus SC 400 1997 List of elements for Exterior Lamps Wiring Diagram (1 of 2) for Lexus SC 400 1997: 50 (body harness, left door sill) (body harness, left rear of trunk) (usa) (canada) Am1 fusible link 100a Automatic light control sensor B23 B25 B25 (body harness, left side of trunk) B27 C10 C14 C16 C25 Combination meter Combination switch D13 Diode E12 Fuse block (left side of engine compartment) G200 (left kick panel) G305 (below right "b" pillar) G308 (below left "b" pillar) G407 (center rear of trunk) Gauge fuse 10a Head High mount stop light Hot at all times Hot in on or start I10 Integration relay (left side of i/p) J/b 1 (left kick panel) J/b 3 (behind cluster) 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 Stop fuse 15a Stop light Stop light switch (near brake pedal) Tail Tail fuse 15a Tail- lights Taillight relay Turn signal light Turn signal light W/ rear spoiler W/o rear Exterior Lamps Wiring Diagram (2 of 2) for Lexus SC 400 1997 List of elements for Exterior Lamps Wiring Diagram (2 of 2) for Lexus SC 400 1997: 41 (behind cluster) (engine harness, front of eng compt) e2 (engine harness, left side of eng compt) e10 (i/p harness, left side of dash) (i/p harness, left side of dash) i9 A10 B14 C13 C25 Combination meter Combination turn switch signal switch D10 E18 E19 E2 (sc 300) e1 (sc 400) E2 (sc 400) e1 (sc 300) 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 (i/p harness, left side of dash) J/b 1 (left kick panel) J/b 3 Left Left front parking light Left front side marker light Left front turn light Left turn signal ind R/b 2 (left side of engine compartment) R/b 4 (left kick panel) 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 5) for Lexus SC 400 1997 List of elements for Ground Distribution Wiring Diagram (1 of 5) for Lexus SC 400 1997: 51 (body harness, left side of passenger compt) b18 (engine harness, front of eng compt-sc 300, right front of eng compt-sc 400) e2 (sc 300) e6 (sc 400) (engine harness, front of engine compt) e2 (engine harness, right front of eng compt) e1 (front side of right fender) (sc300) (sc400) (w/ tcs) (w/o tcs) A/c dual pressure switch A/c single pressure switch A11 A30 A5 a7 Abs actuator Abs solenoid relay Brake fluid level switch Data link connector 1 Data link connector 3 Daytime running light relay no. 3 and relay no. 4 (canada) E12 E16 (engine harness, right rear of eng compt) E2 (engine harness, front of eng compt) E4 (engine harness, left front of eng compt) E5 (engine harness, left front of eng compt) E7 (engine harness, right side of eng compt) E8 (engine harness, left side of engine) E9 (engine harness, left side of eng compt) Efi main relay Engine hood courtesy switch Engine control module Engine oil level warning switch G100 (front side of left fender) G101 G114 sc400 (left rear side of cylinder head) Heated oxygen sensor (bank 1, sensor 1) Heater relay Left front fog light Left front parking light Left front side marker light Left front turn signal light Left low beam headlight Mobile phone Noise filter (defogger system) 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 5) for Lexus SC 400 1997 List of elements for Ground Distribution Wiring Diagram (2 of 5) for Lexus SC 400 1997: 41 (engine harness, rear of eng compt) e24 (i/p harness, left side of i/p) i18 (sc 300) Auto antenna motor & relay B10 (body harness, below left front seat) B18 (body harness, left side of passenger compt) B25 (body harness, left side of trunk) B27 (body harness, left rear of trunk) C12 Combination meter Data link connector 1 Data link connector 2 Data link connector 3 Driver's power seat control switch Driver's power seat ecu Driver's seat heater E12 (a/t) E14 (m/t) E19 (engine harness, left side of engine) Engine control module Engine oil level warning switch Fuel pump Fuel pump ecu G110 (front side of intake manifold) G117 (right rear side of cylinder head) G308 (below left "b" pillar) G407 (center rear of trunk) Heated oxygen sensor (bank 1, sensor 1) Heated oxygen sensor (bank 2, sensor 1) Heated oxygen sensor (bank 2, sensor 2) I25 (i/p harness, right side of i/p) Left buckle switch Left rear combination light License plate light Light failure sensor Luggage compartment key unlock switch Noise filter P13 Power steering pressure switch Right rear combination light W/ memory seat only Ground Distribution Wiring Diagram (3 of 5) for Lexus SC 400 1997 List of elements for Ground Distribution Wiring Diagram (3 of 5) for Lexus SC 400 1997: 64 (body harness, front of roof) b16 (body harness, front of roof) b7 (body harness, inside left door) b3 (body harness, left "a" pillar) b6 (i/p harness, center of i/p) i13 (i/p harness, left kick panel) i3 (i/p harness, left side of i/p) i16 (i/p harness, left side of i/p) i2 (w/ memory seat) (w/o memory seat) Airbag sensor assembly B6 (body harness, left "a" pillar) B7 (body harness, front of roof) C13 C16 Combination meter Cooling fan ecu Cruise control ecu Cruise control switch D10 Deterrent & door lock ecu t7 Dimmer switch (combination switch) E18 From j/b 3 pin a1 (diagram 5 of 5) Front of eng compt) G200 (left kick panel) G206 (left instrument panel brace) H13 I14 (i/p harness, right side of i/p) I2 (i/p harness, left kick panel) I5 (i/p harness, left side of i/p) I7 (i/p harness, left side of i/p) Ignition main relay Inner mirror Integration relay J/b 1 (left kick panel) K12 Key inter- lock solenoid (ignition switch) Left door key lock & unlock switch Left door lock/ unlock motor & door detection position switch Left high beam headlight 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 Red Remote control mirror ecu Remote control mirror switch Right high beam headlight Right vanity light Theft Tilt & power telescopic ecu To g203 & g305 (diagram 4 of 5) Turn signal flasher Unlock warning switch (ignition switch) W/ moon roof W/o moon roof Wiper & washer switch (combination switch) Wiper motor Ground Distribution Wiring Diagram (4 of 5) for Lexus SC 400 1997 List of elements for Ground Distribution Wiring Diagram (4 of 5) for Lexus SC 400 1997: 57 (body harness, top of left front seat) b13 (i/p harness, right side of i/p) (right side of rear pillar) (w/ memory seat) (w/o memory seat) A20 A22 A24 Abs & traction ecu Abs ecu B10 (body harness, left front seat bottom) B11 (body harness, left door sill) B15 B15 (body harness, inside right door) B22 (body harness, rear of passenger compt) B23 (body harness, (right side of rear package shelf) B4 (body harness, left door sill) B8 (body harness, left front seat bottom) Blower motor control relay C25 Combination meter Driver's power seat control switch Driver's power seat ecu Driving position memory & return switch From g206 (diagram 3 of 5) Front vertical position sensor Fuel lid opener solenoid G203 (right kick panel) G302 (under left ashtray) G305 (below right "b" pillar) G905 High mount stop light I13 (i/p harness, left side of i/p) I16 (i/p harness, right side of i/p) I19 (i/p harness, right side of i/p) I21 (i/p harness, right side of i/p) I24 Left slide position sensor Passenger's power seat control switch Passenger's power seat ecu Passenger's seat heater Pps ecu R14 Rear vertical position sensor Rear window defogger Reclining motor control (power seat motor) Right door key & unlock switch Right door lock control switch Right door lock/unlock motor & door detection position switch Right remote control mirror T10 T12 Throttle driver Tilt & power telescopic ecu W/ tcs only W/o spoiler w/ spoiler W/o tcs only Wireless door lock ecu Ground Distribution Wiring Diagram (5 of 5) for Lexus SC 400 1997 List of elements for Ground Distribution Wiring Diagram (5 of 5) for Lexus SC 400 1997: 39 (i/p harness, center of i/p) i9 (i/p harness, right sideof i/p) i18 (sc 400) A/c control assembly A/t A/t indicator light (shift lever) A10 B28 or b29 (body harness, right side of trunk) C12 C25 Cigarette lighter Combination meter D10 Data link connector 2 Data link connector 3 G117 (right rear side of cylinder head) G302 (under right ashtray) Glove box light switch H14 H15 Heated oxygen sensor (bank 1, sensor 2) Heated oxygen sensor (bank 2, sensor 2) I23 (i/p harness, behind right side of i/p) I34 (i/p harness, below front of floor console) J/b 3 (center of i/p) M/t O/d main switch Radio & player Rheostat S15 Seat heater switch Shift lock ecu Stereo power amplifier T11 To j/b 1 pin e18 (diagram 3 of 5) Traction cut switch W/ cd player W/o cd player Woofer speaker amplifier
HEADLIGHTS Headlight Wiring Diagram, with DRL for Lexus SC 400 1997 List of elements for Headlight Wiring Diagram, with DRL for Lexus SC 400 1997: 82 (eng harn, left front of eng compt) e8 (i/p harness, left side of dash) i7 (left front fender) (left kick panel) 10a 15a A10 A11 A12 A13 Am1 fuse 100a Auto Automatic light control sensor (left side of dash) C13 C25 Combination meter Combination switch Cty D10 Daytime running light no. 2 relay (left front of eng compt) Daytime running light no.3 and no. 4 relay (left front of eng compt) Dimmer switch Dome fuse 10a Drl fuse 7.5a E1 (eng harn, right front of eng compt) E10 (engine harn, left side of eng compt) E13 E17 E18 E2 (engine harness, front of engine compartment) E3 (engine harness, front of eng compt) Egu-b fuse Egu-ig fuse Eng compt) Flash Fog fuse 15a Fog light relay Fog light switch Fuse block G100 G100 (front side of left fender) G101 (front side of right fender) G200 Gauge fuse Head Head (lh- lwr) fuse 15a Head (lh- upr) fuse 15a Head (rh- lwr) fuse 15a Head (rh- upr) fuse 15a Head ind Headlight relay High High beam ind Hot at all times Hot in start or on I16 Integration relay Interior lights system J/b 1 (left kick panel) J/b 3 (left kick panel) K11 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 Panel fuse 7.5a Parking brake switch (bottom of park brake) R/b 2 (left side of eng compt) R/b 4 (left kick panel) R/b 5 (left kick panel) Red Right fog light Right hi beam head- light Right low beam head- light Starting/ charging system Tail Taillight relay Trly Headlight Wiring Diagram, without DRL for Lexus SC 400 1997 List of elements for Headlight Wiring Diagram, without DRL for Lexus SC 400 1997: 72 (behind center of dash) j/b 3 (engine harn, front of eng compt) (engine harn, right front of eng compt) e1 (i/p harness, at left kick panel) (i/p harness, left side of dash) i7 (left kick panel) (or red) Auto Automatic light control sensor (left side of dash) C13 C25 Combination meter Combination switch Cty D10 Dimmer relay Dimmer switch Dome fuse 10a E10 (engine harn, left side of eng compt) E13 E17 E18 E2 (engine harness, front of eng compt) Egu-b fuse 15a Egu-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 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 indicator Headlight relay High High beam indicator Hot at all times Hot in start or on I16 I3 (i/p harness, left kick panel) Integration relay J/b 1 (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 R/b 2 (left side of eng compt) R/b 4 (left kick panel) R/b 5 (left kick panel) Red Right fog light Right hi beam head- light Right low beam head- light Sc 300 Sc 400 Sc300 only Sc400 only Tail
HORN Horn Wiring Diagram for Lexus SC 400 1997 List of elements for Horn Wiring Diagram for Lexus SC 400 1997: 12 (engine harness, front of eng compt) e4 Combination switch Haz-horn fuse 15a Horn Horn relay Horn switch Hot at all times Left horn R/b 2 (left side of engine compartment) R/b 4 (front of j/b 1, left kick panel) Right horn Theft deterrent & door lock ecu (left side of dash)
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram (2 of 2) for Lexus SC 400 1997 List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Lexus SC 400 1997: 61 (behind left side of dash) j/b 1 (i/p harn, center of dash) (i/p harn, left side of dash) (i/p harn, right side of dash) A/b A/t A/t indicator light (shift lever) A/t indicator light switch (part of park/ neutral position switch) Airbag sensor assembly (behind center of dash) Anti-theft system Brake fluid level warning switch (on brake fluid reservoir) Clock/ outside temp Clutch start switch (left side of dash) Cruise control ecu (left side of dash) D11 Diode (parking brake) (r/b 4, left side of dash) Dome fuse 10a E11 E18 Electronic control transmission pattern select switch (below center of console) Engine control module Engine control module (center of dash) Engine oil level warning switch (left front of engine) G101 (front side of right fender) G114 (sc 400) (left rear side of cylinder head) G117 (sc 300) (right rear side of cylinder head) G200 (left kick panel) Hot at all times Hot in start I17 I2 (usa (m/t) w/ driving position sensor) i3 (ex for usa (m/t) w/ driving postion sensor) (i/p harness, left kick panel) I25 (sc 300 a/t) i26 (sc 300 m/t) i28 (sc 400) (i/p harness, right side of i/p) I26 I29 I29 (i/p harn, right side of dash) J/b 1 (left kick panel) 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) M/t Normal O/d main Oil level Oil temp P/n Park/ neutral position switch (rear of eng compt) Parking brake switch (below console) Power Red Reset Set St fuse 7.5a Starter relay Switch Theft Trip Trip switch & theft deterrent indicator light Usa w/ a/t, w/o driving position memory Usa w/ m/t and driving position memory or canada W/o traction control
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram for Lexus SC 400 1997 List of elements for Courtesy Lamps Wiring Diagram for Lexus SC 400 1997: 53 (body harness, front of roof) b7 (body harness, inside left door) b1 (body harness, left "a" pillar) b6 (i/p harness, left side of dash) i5 (inside right door) (left kick panel) (right kick panel) (usa) (canada) 10a A2 b1 A3 i16 B1 (body harness, inside left door) B6 (body harness, left "a" pillar) B7 (body harness, front of roof) C25 Cig/radio fuse 15a D10 Dome fuse Door Door ind E11 G200 G203 Gauge fuse 10a H10 Hot at all times Hot in on or acc Hot in on or start I16 I5 (i/p harness, left side of dash) Ignition key cylinder light Instrument cluster c25 Integration relay Interior J/b 1 (left kick panel) J/b 3 (behind instrument cluster) Left door courtesy lamp Left door lock/unlock motor and door detection position switch (inside left door) Left vanity light Luggage compartment lamp Luggage compartment light switch (center of rear panel) Map Off Personal light Pnk R/b 2 (left side of eng compt) R/b 4 (left kick panel) Red Red i22 (i/p harn, right side of dash) Right door courtesy lamp Right door lock/unlock motor and door detection position switch Right vanity light Step light Instrument Illumination Wiring Diagram for Lexus SC 400 1997 List of elements for Instrument Illumination Wiring Diagram for Lexus SC 400 1997: 57 (behind instrument cluster) (i/p harn, left side of dash) i9 (i/p harness, center of i/p) i32 (w/ cd player) (w/o cd player) A/c control & A/c control assembly A/t indicator lamp A10 A12 Am1 fusible link 100a B10 B11 C12 C25 Canada Cigarette lighter lamp Cluster) Combination meter Combination switch D13 E12 E18 Electronic controlled transmission pattern select switch lamp Fuse block (in r/b 2) G200 (left kick panel) Gauge fuse 10a Glove box lamp Glove box light switch H10 Hazard switch lamp Head Hot at all times Hot in run I8 (i/p harness, left side of i/p) Illumination Indicator Instrument cluster system Integration relay Integration relay (left side of i/p) J/b 1 (left kick panel) J/b 3 J/b 3 (behind instrument J/b 3 (behind instrument cluster) K11 Off Panel fuse 7.5a R3 r4 R3 r5 Radio & player lamp Radio switch lamp Rheostat Solid state Tail Taillight relay Traction cut & seat heater switch lamp Trip switch & theft deterrent Usa
MEMORY SYSTEMS Memory Mirrors Wiring Diagram for Lexus SC 400 1997 List of elements for Memory Mirrors Wiring Diagram for Lexus SC 400 1997: 55 (left instrument panel brace) (right side of dash) (m/t) (under left ashtray) Acc Defogger system Down Driver's power seat ecu (under driver's seat) Driver's power seat ecu shield Driving position memory and return switch (left side of dash) Ecu-b fuse 15a G206 G302 Gnd H10 Hot at all times Hot in acc or on Hsrl Hsrr I1 (i/p harness, left kick panel) I14 I14 (i/p harness, center of dash) J/b 1 (left kick panel) Left Left remote control mirror Left/ right M+l M+r Mhl Mhr Mry Mvl Mvr N0. 1 N0. 2 Nca Operation switch P14 Pnk Rad n0. 2 fuse 7.5a Remote control mirror ecu (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 (left side of dash) (a/t) Up/ down Vsrl Vsrr Memory Power Tilt & Power Telescopic Wiring Diagram for Lexus SC 400 1997 List of elements for Memory Power Tilt & Power Telescopic Wiring Diagram for Lexus SC 400 1997: 74 (body harn, below driver's seat) (i/p harness, left kick panel) i1 (i/p harness, left side of dash) (i/p harness, left side of dash) i7 (left instrument panel brace) (left side of dash) 10a 15a 30a A/t Asw Auto sw B4 (body harness, left door sill) D10 Dome fuse Door detection position switch Driver's power seat ecu (under driver's seat) Driver's power seat ecu shield Driving position memory and return switch (left side of i/p) Dsw Ecu-b Ecu-ig fuse Ecue G200 (left kick panel) G206 G302 (under left ashtray) Gauge fuse Gnd H10 H12 H13 H15 Hot at all times Hot in start or on I16 J/b 1 (left kick panel) K13 Left door lock/ unlock motor & M/t Manual sw Mry Msw N0. 1 N0. 2 Nca P (pkb) Park/neutral position switch (on transmission) Parking brake switch (bottom of parking brake handle) Pnk Power fuse R/b 2 (left side of eng compt) Red Remote control mirror ecu (center of dash) Set Ssr- T10 Telesco long Telesco short Telescopic control motor Telescopic position sensor Tem+ Tem- Tes Tilt & power telescopic ecu (left side of i/p) Tilt and 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 Seat Wiring Diagram (1 of 2) for Lexus SC 400 1997 List of elements for Memory Seat Wiring Diagram (1 of 2) for Lexus SC 400 1997: 69 (body harness, below left front seat) b10 (body harness, below left front seat) b9 (i/p harness, left kick panel) (i/p harness, left kick panel) i13 +b2 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- Fup Fvr+ G308 (below left "b" pillar) Gnd Gnd2 Hot at all times Hot in start or on I10 J/b 1 (left side of dash) Left door open detection switch Lumbar support Lumbar support motor (under left seat) Mry Nca No. P13 P14 Pnk Power seat ecu (under driver's seat) Pvcc Rcl+ Rcl- Rclf Rclr Rdwn Rear Reclining Red Rrv+ Rrv- Rup Set Sgnd Shield Sld+ Sld- Sldf Sldr Slide Ssfv Ssrr Ssrs Ssrv Stop Stop fuse 15a Stop light switch (on brake support) Sysb Tilt/ power telescopic ecu (behind left side of dash) Vertical rear Memory Seat Wiring Diagram (2 of 2) for Lexus SC 400 1997 List of elements for Memory Seat Wiring Diagram (2 of 2) for Lexus SC 400 1997: 63 (body harn below driver's seat) (body harn, below driver's seat) b10 (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 ashtray) G305 (below right "b" pillar) Gauge fuse 10a Gnd H10 H12 Hold Hot at all times Hot in on or start J/b 1 (left side of dash) J/b 1 (left side of i/p) Lumbar support Lumbar support motor (under right seat) M/t P15 Park/ neutral position switch (closed in "r") Parking brake 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 (in right "b" pillar) Pbcl Pfsw Prdc Pvcc R/b 2 (left side of engine comp) Rear Rear vertical motor (under right seat) Rear vertical position sensor (under driver's seat) Rear verticle Reclining Reclining motor (under right seat) Red Release 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 1997 List of elements for Electric Tension Reducer Wiring Diagram for Lexus SC 400 1997: 14 (body harness, under right front seat) b13 Door fuse 30a Ecu-ig fuse 15a G305 (below right "b" pillar) G308 (below left "b" pillar) Hot at all times 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 1997 List of elements for Power Antenna Wiring Diagram for Lexus SC 400 1997: 37 (i/p harness, center of dash) (w/ cd player) (w/o cd player) 15a 20a 7.5a Acc Amp+b Ant+b Anta Antb Auto antenna control relay Auto antenna motor Auto antenna motor & relay (left side of trunk) B20 (body harn, below rear seat) Down E10 Ecu-ig fuse G407 (center rear of trunk) Gnd Hot at all times Hot in acc or on Hot in start or on I34 J/b 1 (left kick panel) R/b 2 (left side of eng compt) Radio & player Radio n0. 1 fuse Radio no. 2 fuse Red Sgnd Sig Solid state Sound system Svcc W/ cd W/o cd
POWER DISTRIBUTION Power Distribution Wiring Diagram (1 of 3) for Lexus SC 400 1997 List of elements for Power Distribution Wiring Diagram (1 of 3) for Lexus SC 400 1997: 71 (engine harness, left side of eng compt) e10 (i/p harn, left side of i/p) (sc300) (sc400) 100a 10a 120a 150a 15a 20a 30a 40a 60a 7.5a Abs motor relay, abs solenoid relay Abs n0. 1 fuse Acc Alt fuse Am1 Am1 fuse Am2 Am2 fuse Battery C13 Canada D11 Data link connector no 3 Dome fuse E10 Engine control module, park/neutral position switch, clutch start switch Fog fuse Fog light relay Fuse block (r/b 2) Generator Haz-horn fuse Horn relay, hazard switch, theft deterrent horn Ig sw fuse Ig1 Ig2 Ignition main relay Ignition switch Inj fuse Integration relay Integration relay, J/b 1 (left kick panel) Lock Main fuse Nca Odb ii fuse 7.5a R/b 2 (left side of eng compt) R/b 4 (front side of j/b 1) Rad no. 2 fuse Radio & player, auto antenna motor & relay, woofer speaker amplifier, stereo power amplifier Radio no. 1 fuse Red Remote control mirror ecu Remote control mirror switch Sc 300 Sc 400 Seat heater switch St fuse St-htr fuse 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, j/b 1 (diagram 2 of 3) To daytime running light relay no. 2 (diagram 3 of 3) To def fuse, r/b 2 (diagram 3 of 3) To door fuse, j/b 1 (digram 2 of 3) To efi fuse r/b 2 (diagram 3 of 3) To gauge fuse, j/b 1 (diagram 2 of 3) To ign fuse, j/b 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 1997 List of elements for Power Distribution Wiring Diagram (2 of 3) for Lexus SC 400 1997: 63 10a 15a 20a 30a 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 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 Ecu-ig fuse Engine control module, license lights, light failure sensor Engine fuse From am1 fuse (diagram 1 of 3) From ignition switch (diagram 1 of 3) From ignition switch, (diagram 1 of 3) From rad no 2 fuse, j/b 1 (diagram 1 of 3) G10 G200 (left kick panel) Gauge fuse 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 I10 I14 I21 (i/p harness, right side of i/p) Ign fuse Igniter no 1 (sc 400), igniter no 2 (sc 400), ignition coil no 1 (sc 400), igniton coil no 2 (sc 400), noise filter, igniter (sc 300), ignition coil (sc 300), fuel injectors, idle air control valve (sc 300), fuel pressure up vsv (sc 300), egr vsv (sc 300), engine control module (sc 300), efi main relay (sc 300), evap vsv (sc 300), intake control valve vsv (sc 300), data link connector 1 (sc 300), heated oxygen sensors (sc 300), fuel pump ecu (sc 300), mass air flow meter (sc 300) Integration relay Interior lights system J/b 1 (left kick panel) J/b 3 (center of i/p) K10 K13 Panel fuse Parking lights, front side marker lights Power main relay Pwr fuse Stop fuse Stop light switch Tail fuse 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 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 Power Distribution Wiring Diagram (3 of 3) for Lexus SC 400 1997 List of elements for Power Distribution Wiring Diagram (3 of 3) for Lexus SC 400 1997: 54 (engine harn, left front of engine compartment) e5 (usa sc 300) 10a 15a 30a 50a 60a 7.5a Alt sensing fuse Daytime running light relay no 3 Daytime running light relay 2 (canada) Daytime running light relay no 4 Def fuse Defogger relay Dimmer relay (usa sc 400) Drl fuse (canada) E10 (engine harness, left side of eng compt) E8 (engine harness, left side of eng compt) Efi fuse Efi main relay Engine control module Fog light relay, left low beam headlight, left hi beam headlight (usa sc 300) From alt fuse, fuse block (diagram 1 of 3) From haz-horn fuse, r/b 2 (digram 1 of 3) From main fuse, fuse block (diagram 1 of 3) From tel fuse, r/b 2 (diagram 3 of 3) Generator Head (lh) Head (lh-lwr) (canada & sc 400) fuse Head (lh-upr) fuse Head (lh-upr) fuse 15a Head (rh) Head (rh-lwr) (canada & sc 400) fuse Head (rh-upr) fuse Head (rh-upr) fuse 15a Headlight relay Heater relay Htr fuse J/b 1 (left kick panel) Left and right mirror heater, idle-up diode Left hi beam headlight Mir-htr fuse Noise filter (defogger system) R/b 2 (left side of eng compt) Red Right hi beam headlight, combination meter Right low beam headlight, combination meter (usa sc 300), right hi beam headlight (usa sc 300) Starter Starter relay Tel fuse Telephone transceiver & speaker relay Throttle driver To headlight relay, r/b 2 (diagram 3 of 3) Trac fuse
POWER DOOR LOCKS Keyless Entry & Anti-Theft Wiring Diagram (1 of 2) for Lexus SC 400 1997 List of elements for Keyless Entry & Anti-Theft Wiring Diagram (1 of 2) for Lexus SC 400 1997: 78 (body harness, left rear door sill) (i/p harn, right side of i/p) (i/p harness, left side of i/p) (i/p harness, right side of i/p) (i/p harness, right side of i/p) i14 Acc Act+ Act- Actd B1+ B18 Bzr Bzr2 Cig fuse 15a Cty Diode (in r/b 4) 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) G305 (below right "b" pillar) Gauge fuse 10a Grd H10 Head Headlight relay Horn Horn relay Hot at all times Hot in run Hot in run or accy Hot in run or start I14 I14 (i/p harn, right side of i/p) I16 I22 I22 (i/p harn, right side of i/p) Ind Integration relay J/b 1 (left side of i/p) J/b 2 (left side of engine compt) J/b 3 (behind cluster) K13 Ksw Left front door key lock/unlock switch Lock Lock/unlock switch Lswd Lswp Lug Luggage compartment light switch (center rear of trunk) Master power window/door lock control switch Pnk Power circuit breaker 30a Power main relay Prly Red Right front door key Right front door lock control switch Srly Starter relay Tail Taillight relay Theft deterrent and door lock ecu (left side of i/p) Tsw Ul1 Ul2 Ul3 Ulsw Unlock Wireless door lock buzzer (left side of eng compt) Wireless door lock ecu (right rear of trunk) Keyless Entry & Anti-Theft Wiring Diagram (2 of 2) for Lexus SC 400 1997 List of elements for Keyless Entry & Anti-Theft Wiring Diagram (2 of 2) for Lexus SC 400 1997: 28 (behind left side of i/p) (i/p harness, center of i/p) i14 B15 C10 C15 D10 G200 (left kick panel) G203 (right kick panel) G302 (under left ashtray) G407 (center rear of trunk) H13 Haz-horn fuse 25a Horn relay Hot at all times I5 (i/p harness, left side of i/p) Instrument cluster J/b 1 J/b 2 (left side of engine comp) 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 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 Mirror Wiring Diagram for Lexus SC 400 1997 List of elements for Electrochromic Mirror Wiring Diagram for Lexus SC 400 1997: 10 Ecu-ig fuse 15a G200 (left kick panel) Hot in on or start I3 (i/p harness, left side of dash) Inner mirror J/b 1 (left kick panel) Left remote control mirror Red Right remote control mirror W/ memory Power Mirror Wiring Diagram for Lexus SC 400 1997 List of elements for Power Mirror Wiring Diagram for Lexus SC 400 1997: 21 (body harness, in left door) b2 (left kick panel) D10 D11 Defogger system Down G200 Hot in acc or on J/b 1 (left kick panel) Left Left remote control mirror Left/ right Left/ up Operation switch Radio 2 fuse 7.5a Remote control mirror switch Right Right remote control mirror Right/ down Select switch Up/ down
POWER SEATS Heated Seats Wiring Diagram for Lexus SC 400 1997 List of elements for Heated Seats Wiring Diagram for Lexus SC 400 1997: 32 (m/t) A10 Am1 fusible link 100a Driver's seat heater (in seat back) Driver's seat heater switch E10 (engine harness, left side of eng compt) E18 Ecu-ig fuse 15a Fuse block (left side of engine comp) G200 (left kick panel) G305 (below right "b" pillar) G308 (below left "b" pillar) H14 Hot at all times Hot in run I3 (i/p harness, left side of dash) Ignition main relay J/b 1 (left side of i/p) J/b 3 (behind cluster) J/b 3 (behind combination meter) K13 Left Passenger's seat heater (in seat back) Passenger's seat heater switch R/b 4 (left kick panel) Right S8 (m/t) (a/t) S8 (m/t) t11 (a/t) S8 t11 (a/t) Seat heater switch Seat-htr fuse 15a T11
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagrams for Lexus SC 400 1997 List of elements for Power Top/Sunroof Wiring Diagrams for Lexus SC 400 1997: 47 (center front of roof) +b1 +b2 15a 30a B16 (body harness, front of roof) B16 (body harness, left "a" pillar) Close Cls D10 Dome fuse 20a Door fuse Down Dswp Dwn Ecu-ig fuse G2 red G200 (left kick panel) G203 (right kick panel) Gnd H10 H15 Hot at all times Hot in on or start I16 Is1 Is2 J/b 1 (left side of dash) J/b 2 (left side of eng compt) K13 Left front door lock motor/ door position detection switch Moon roof control relay (center front of roof) Moon roof control switch Moon roof motor & limit switch (center front of roof) Mtr+ Mtr- No. 1 No. 2 Open Opn Pnk Power fuse Power main relay Red Right front door lock motor/ door position detection switch Rly Theft deterrent & door lock ecu (right side of dash)
POWER WINDOWS Power Window Wiring Diagram for Lexus SC 400 1997 List of elements for Power Window Wiring Diagram for Lexus SC 400 1997: 33 (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 1997 List of elements for Base Radio, without CD Changer for Lexus SC 400 1997: 63 (center back panel) g407 (console box harness, under front end of center console) i34 (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 (on antenna motor, on 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 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 Mute Pnk Pwr R/b 2 (in left front 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 Wp+ Wp- with CD Changer, Nakamichi for Lexus SC 400 1997 List of elements for with CD Changer, Nakamichi for Lexus SC 400 1997: 85 (console box harness, under front end of center console) i34 (floor 3 harness, right side of luggage compartment) b29 (floor 3 harness, under center console) (floor 3 harness, under rear seat) b20 (floor main harness, at base of left "b" pillar) b18 (under right ashtray) g302 A/c control switch & radio switch A10 A11 A12 A13 A14 A15 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 Cd player Cdl+ Cdl- Cdr+ Cdr- D10 D11 D12 E10 Fl+ Fl- Fr+ Fr- Gnd Hot at all times Hot in acc or on 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 Luggage compartment light switch Mute Pnk Power antenna system Pwr R/b 2 (in left front, 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 (on 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 1997 List of elements for with CD Changer, Pioneer for Lexus SC 400 1997: 90 (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 center console) (floor 3 harness, under rear seat) (floor 3 harness, under rear seat) b20 (floor main harness, at base of left "b" pillar) b18 (under right ashtray) g302 A/c control switch & radio switch A10 A11 A12 A13 A14 A15 Acc Amp Ant Anta Antb Aud+ Aud- Automatic cd changer B10 B12 B12 (floor 3 harness, under center console) B20 B24 (floor 3 harness, right side of rear windshield at base) B30 (floor 3 harness, right side of luggage compartment) Beep Cd player Cdl+ Cdl- Cdr+ Cdr- D10 D11 D12 E10 Fl+ Fl- Fr+ Fr- Gnd Hot at all times Hot in acc or on 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 Luggage compartment light switch Mute Pnk Power antenna system Pwr R/b 2 (in left front 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 (on 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 front of luggage compartment)
SHIFT INTERLOCKS Shift Interlock Wiring Diagram for Lexus SC 400 1997 List of elements for Shift Interlock Wiring Diagram for Lexus SC 400 1997: 28 (left kick panel) 15a 15aa Acc Cig fuse E17 E18 E20 Ecu-ig fuse G200 H13 H15 Hot at all times Hot in acc or run Hot in run or start I10 J/b 1 (left kick panel) J/b 3 (behind combination meter) Key interlock solenoid (on steering column) Kls+ Shift lock control switch (bottom of shift lever) Shift lock ecu (below center console) Shift lock solenoid (below center console) Sls+ Sls- Stop fuse Stop light switch (on brake pedal support) Stp
STARTING/CHARGING Charging Wiring Diagram for Lexus SC 400 1997 List of elements for Charging Wiring Diagram for Lexus SC 400 1997: 20 (sc 300) (sc 400) Alt fusible link 120a 150a Alt sensing fuse 7.5a Battery C14 Charging warning light Combination meter Engine fuse 7.5a Fuse block (relay box 2) Generator Hot in run or start I21 (i/p harness, right side of dash) Ign fuse 7.5a Integration relay (left side of i/p) of dash, in j/b 1) J/b 1 (left side of i/p) J/b 3 (behind center of i/p) Main fusible link 60a Nca R/b 2 (left side of engine compartment) Starting circuit Starting Wiring Diagram for Lexus SC 400 1997 List of elements for Starting Wiring Diagram for Lexus SC 400 1997: 25 (on transaxle) Acc Alt fusible link 150a Am1 Am1 fusible link 100a Battery Engine controls system Fuse block (relay box 2) Ignition switch Igsw fuse 40a Instrument cluster system J/b 1 (left kick panel) Lock Main fusible link 60a Nca Park/ neutral position switch R/b 2 (left side of engine compartment) Run Srly St fuse 7.5a St1 Start Starter motor Starter relay Theft deterrent & door lock control ecu (behind left side of dash)
SUPPLEMENTAL RESTRAINTS Supplemental Restraint Wiring Diagram for Lexus SC 400 1997 List of elements for Supplemental Restraint Wiring Diagram for Lexus SC 400 1997: 24 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
TRUNK, TAILGATE, FUEL DOOR Trunk & Fuel Door Release Wiring Diagram for Lexus SC 400 1997 List of elements for Trunk & Fuel Door Release Wiring Diagram for Lexus SC 400 1997: 18 (left center pillar) Acc Cig fuse 15a Door fuse 30a Ecu-ig fuse 15a Fuel lid opener solenoid (right side of trunk) Fuel lid opener switch G200 (left kick panel) G414 Hot at all times Hot in accy or run Hot in run J/b 1 (left kick panel) J/b 3 (center of dash) Luggage compartment door opener motor (center rear of trunk) Luggage compartment door opener switch Theft deterrent & door lock ecu (left side of dash) Trk
WARNING SYSTEMS Warning System Wiring Diagrams for Lexus SC 400 1997 List of elements for Warning System Wiring Diagrams for Lexus SC 400 1997: 25 C12 C14 C25 Combination meter D10 D13 Dome fuse 10a E12 G200 (left kick panel) G308 (below left "b" pillar) Gauge fuse 10a H13 Hot at all times Hot in start or on I15 Integration relay J/b 1 (left kick panel) J/b 3 (behind center of dash) Left buckle switch (inside driver's seat belt buckle) Left door lock/ unlock motor & door detection position switch R/b 2 (left side of eng compt) Red Seat belt warning light Timer/buzzer Unlock warning switch (in ignition switch)
WIPER/WASHER Wiper/Washer Wiring Diagram for Lexus SC 400 1997 List of elements for Wiper/Washer Wiring Diagram for Lexus SC 400 1997: 34 (i/p harness, left kick panel) i2 10a 20a A13 B17 C14 C15 C16 C25 Combination meter D13 E12 G100 (front side of left fender) G200 (left kick panel) Gauge fuse H16 High Hot in start or on Int Int. time J/b 1 (left kick panel) J/b 3 (behind combination meter) Low/ mist Off Solid state Switch (combination switch) Washer level ind. Washer level switch (in washer fluid reservoir) Washer motor (left front of eng compt) Washer switch Wiper & washer c15 Wiper fuse Wiper motor (left rear of eng compt)
