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 300 1998 List of elements for Air Conditioning Wiring Diagrams (1 of 2) for Lexus SC 300 1998: 63 (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 300 1998 List of elements for Air Conditioning Wiring Diagrams (2 of 2) for Lexus SC 300 1998: 66 (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 300 1998 List of elements for Anti-lock Brake Wiring Diagrams, with Traction Control (1 of 2) for Lexus SC 300 1998: 58 (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 300 1998 List of elements for Anti-lock Brake Wiring Diagrams, with Traction Control (2 of 2) for Lexus SC 300 1998: 49 (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 300 1998 List of elements for Anti-lock Brake Wiring Diagrams, without Traction Control for Lexus SC 300 1998: 66 (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 300 1998 List of elements for Anti-theft Wiring Diagram (1 of 2) for Lexus SC 300 1998: 79 (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 300 1998 List of elements for Anti-theft Wiring Diagram (2 of 2) for Lexus SC 300 1998: 24 (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 300 1998 List of elements for Computer Data Lines for Lexus SC 300 1998: 51 (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 300 1998 List of elements for Cooling Fan Wiring Diagram for Lexus SC 300 1998: 28 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 300 1998 List of elements for Cruise Control Wiring Diagram for Lexus SC 300 1998: 74 (behind left (dash harness, right side of dash) (engine harn, top left of engine) e21 (left rear (right rear of cylinder head) 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 Cruise control switch Cruise ind D13 Dash) E01 E02 E03 E12 Efi fuse 30a Efi main relay Engine control module (behind lower right side of dash) Etcs fuse 15a G100 (front of left front fender) G120 G131 (on intake manifold) G131 (on intake manifold) Gauge fuse 10a Ge01 H12 Hot at all times Hot in on or start I10 I25 I25 (dash harn, right side of dash) I27 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 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 (on transmission) Vpa Vpa2 Vta Vta2
DEFOGGERS Defogger Wiring Diagram for Lexus SC 300 1998 List of elements for Defogger Wiring Diagram for Lexus SC 300 1998: 27 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 300 1998 List of elements for Electronic Power Steering Wiring Diagram for Lexus SC 300 1998: 22 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
3.0L 3.0L, Engine Performance Wiring Diagrams (1 of 4) for Lexus SC 300 1998 List of elements for 3.0L, Engine Performance Wiring Diagrams (1 of 4) for Lexus SC 300 1998: 76 (dash harn, lower right end of dash) (engine harn, left side of engine) (engine harn, right side of firewall) (front side of intake manifold) (left rear side of cylinder head) (top center of engine) camshaft timing oil control valve Acis Braided Camshaft position sensor (left rear side of engine) Cl+ Cl- Conn e15 Conn e16 Crankshaft position sensor (right front of engine) Dash harn, right side of dash) E01 E02 E03 E19 E21 E24 Els2 Engine control module (behind lower right side of dash) Evap Evg G112 G131 G131 (front side of intake manifold) G203 (right kick panel) Ge01 Htl Htr I19 I21 I25 I27 (dash harn, right side of dash) Igf Igniter (on left front shock tower) Ignition coil 1 Ignition coil 2 Ignition coil 3 Igt Igt2 Igt3 Injector 1 Injector 2 Injector 3 Injector 4 Injector 5 Injector 6 Instrument cluster system Instrument cluster system (tachometer) Knk1 Knk2 Knock sensor 1 (left side of engine) Knock sensor 2 (left side of engine) Mass airflow meter (in air intake duct) Me01 Ne- Noise filter (on left front strut tower) Nsw Ocv+ Ocv- Oxl1 Oxr1 Power steering oil pressure switch (left front of engine) Red Tha Throttle control motor (on throttle body) Thw Vpa Vpa2 Vsv (acis) (left side of engine) Vsv (evap) (left rear of engine) Vta Vta2 3.0L, Engine Performance Wiring Diagrams (2 of 4) for Lexus SC 300 1998 List of elements for 3.0L, Engine Performance Wiring Diagrams (2 of 4) for Lexus SC 300 1998: 59 (1999) (dash harn, right side of combination meter) (dash harn, right side of dash) (engine harn, front of left shock tower) e23 (engine harn, left fender apron) (engine harn, left side of engine) (engine harn, right side of firewall) Acc Accel position sensor (right rear side of engine) Am1 Am2 B18 Braided E20 E21 E24 Efi fuse 30a Efi relay Engine coolant temperature sensor (left front side of engine) Fpc Fuel pump (in fuel tank) Fuel pump ecu (left side of luggage compartment) G100 (front side of left fender) G112 (left rear side of cylinder head) G131 (front side of intake manifold) G308 (lower left "b" pillar) Heated oxygen sensor (bank 1 sensor 1) (right front 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 Hot w/def relay energized Hot w/taillight relay energized Htl Htr I13 I21 (dash harn, lower right end of dash) I25 I27 Ig2 Ign fuse 7.5a Ignition switch Instrument cluster system Junction block 1 K10 Lock Mirhtr fuse 10a Oxl1 Oxr1 P/n Park/neutral position switch (on transaxle) Pnk Red Relay block 2 Short connector (behind right side of dash) St fuse 7.5a St1 Start Starting/charging system Tail fuse 7.5a Throttle position sensor (on throttle body) 3.0L, Engine Performance Wiring Diagrams (3 of 4) for Lexus SC 300 1998 List of elements for 3.0L, Engine Performance Wiring Diagrams (3 of 4) for Lexus SC 300 1998: 51 (dash harn, lower right end of dash) i21 (dash harn, right end of dash) (dash harn, right side of dash) (dash harn, top center of dash) i9 (dash harn, upper left side of dash) (left kick panel) (under center console) 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 D10 D13 E12 E18 E19 Electronically controlled transmission pattern select switch G112 (left rear side of cyl head) G131 (front side of intake manifold) G200 Gauge fuse 10a H12 Heated oxygen sensor (bank 1 sensor 2) (on right side of engine, in exhaust manifold) 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 I25 I27 Junction block 1 Junction block 3 Malfunction indicator light Obd fuse 7.5a Oxl2 Oxr2 Pnk Pwr Red Shift lock ecu Snow Stop fuse 15a Stoplight switch (on brake pedal bracket) Vapor pressure sensor (right front corner of engine compt) 3.0L, Engine Performance Wiring Diagrams (4 of 4) for Lexus SC 300 1998 List of elements for 3.0L, Engine Performance Wiring Diagrams (4 of 4) for Lexus SC 300 1998: 91 (1999) (behind left side of dash) data link connector 3 (dash harn, top center of dash) (engine harn, left side of engine) (left kick panel) (near left front strut tower) data link connector 1 (on trans) o/d direct clutch speed sensor (on trans) vehicle speed sensor 2 (right kick panel) (under left ashtray) (unused pins not shown) Acmg Air conditioning system Anti-lock brakes system Anti-theft Bat Batt Braided Ccs Code Conn e17 Conn e18 Conn e19 Conn e20 Cruise control system Data link connector 2 (1998) (left side of dash) E18 E21 E24 Electronically controlled transmission solenoid (in transmission) Els1 Eng+ Eng- Engine control module (behind lower right side of dash) Eom Etcs fuse 15a Fpc G112 (left rear side of cylinder head) G131 (front side of intake mainfold) G200 G200 (left kick panel) G203 G206 (left instrument panel brace) G302 Hot at all times Htl2 Htr2 I17 I20 I26 I27 Igsw Imld Junction block 1 Junction block 3 Key unlock warning switch (behind left side of dash) Ksw Mrel Nco+ Nco- Neo Oil Oxl2 Oxr2 Pnk Ptnk Pwr Red Relay block 2 Rspd Rxck Sil Sln+ Sln- Slt+ Slt- Slu+ Slu- Snwi Snwo Sp2+ Sp2- Sta Sti- Stp Tpc Transponder key amplifier (behind left side of dash) Trc+ Trc- Txct Vsv (vapor pressure sensor) (right front corner of engine compt)
EXTERIOR LIGHTS Back-up Lamps Wiring Diagram for Lexus SC 300 1998 List of elements for Back-up Lamps Wiring Diagram for Lexus SC 300 1998: 11 (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 300 1998 List of elements for Exterior Lamps Wiring Diagram (1 of 2) for Lexus SC 300 1998: 51 (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 300 1998 List of elements for Exterior Lamps Wiring Diagram (2 of 2) for Lexus SC 300 1998: 39 (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 300 1998 List of elements for Ground Distribution Wiring Diagram (1 of 4) for Lexus SC 300 1998: 68 (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 300 1998 List of elements for Ground Distribution Wiring Diagram (2 of 4) for Lexus SC 300 1998: 50 (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 300 1998 List of elements for Ground Distribution Wiring Diagram (3 of 4) for Lexus SC 300 1998: 64 (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 300 1998 List of elements for Ground Distribution Wiring Diagram (4 of 4) for Lexus SC 300 1998: 65 (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 300 1998 List of elements for Headlight Wiring Diagram for Lexus SC 300 1998: 71 (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 300 1998 List of elements for Horn Wiring Diagram for Lexus SC 300 1998: 12 (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 300 1998 List of elements for Instrument Cluster Wiring Diagram (1 of 2) for Lexus SC 300 1998: 97 (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 300 1998 List of elements for Instrument Cluster Wiring Diagram (2 of 2) for Lexus SC 300 1998: 51 (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 300 1998 List of elements for Courtesy Lamps Wiring Diagram for Lexus SC 300 1998: 46 (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 300 1998 List of elements for Instrument Illumination Wiring Diagram for Lexus SC 300 1998: 42 (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 300 1998 List of elements for Memory Mirrors Wiring Diagram for Lexus SC 300 1998: 55 (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 300 1998 List of elements for Memory Power Tilt & Power Telescopic Wiring Diagram for Lexus SC 300 1998: 67 (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 300 1998 List of elements for Memory Seats Wiring Diagram (1 of 2) for Lexus SC 300 1998: 70 (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 300 1998 List of elements for Memory Seats Wiring Diagram (2 of 2) for Lexus SC 300 1998: 58 (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 300 1998 List of elements for Electric Tension Reducer Wiring Diagram for Lexus SC 300 1998: 11 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 300 1998 List of elements for Power Antenna Wiring Diagram for Lexus SC 300 1998: 32 (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 300 1998 List of elements for Power Distribution Wiring Diagram (1 of 3) for Lexus SC 300 1998: 59 (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 300 1998 List of elements for Power Distribution Wiring Diagram (2 of 3) for Lexus SC 300 1998: 61 (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 300 1998 List of elements for Power Distribution Wiring Diagram (3 of 3) for Lexus SC 300 1998: 37 (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 300 1998 List of elements for Keyless Entry & Anti-Theft Wiring Diagram (1 of 2) for Lexus SC 300 1998: 79 (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 300 1998 List of elements for Keyless Entry & Anti-Theft Wiring Diagram (2 of 2) for Lexus SC 300 1998: 24 (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 300 1998 List of elements for Electrochromic Mirrors Wiring Diagram for Lexus SC 300 1998: 10 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 Mirrors Wiring Diagram for Lexus SC 300 1998 List of elements for Power Mirrors Wiring Diagram for Lexus SC 300 1998: 17 B2 (body harness, in left door) D10 D11 Down G200 (left kick panel) Hot in acc or on Junction block 1 (behind left kick panel) Left Left remote control mirror Left/ right Operation switch Radio 2 fuse 7.5a Remote control mirror switch Right Right remote control mirror Select switch Up/ down
POWER SEATS Driver Seat Wiring Diagram for Lexus SC 300 1998 List of elements for Driver Seat Wiring Diagram for Lexus SC 300 1998: 20 Door fusible link 30a Down Driver's power seat control switch Driver's seat front vertical motor (under seat) Driver's seat lumbar motor (in seatback) Driver's seat rear vertical motor (under seat) Driver's seat reclining motor (under seat) Driver's seat slide motor (under seat) Front G309 (rear of left door sill) Hold Hot at all times Junction block 1 (behind left kick panel) Lumbar support Rear Reclining Release Slide Vertical front Vertical rear Heated Seats Wiring Diagram for Lexus SC 300 1998 List of elements for Heated Seats Wiring Diagram for Lexus SC 300 1998: 24 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 300 1998 List of elements for Power Top/Sunroof Wiring Diagrams for Lexus SC 300 1998: 38 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 300 1998 List of elements for Power Window Wiring Diagram for Lexus SC 300 1998: 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 300 1998 List of elements for Base Radio, without CD Changer for Lexus SC 300 1998: 64 (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 300 1998 List of elements for with CD Changer, Nakamichi for Lexus SC 300 1998: 88 (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 300 1998 List of elements for with CD Changer, Pioneer for Lexus SC 300 1998: 93 (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 300 1998 List of elements for Shift Interlock Wiring Diagram for Lexus SC 300 1998: 34 (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
3.0L 3.0L, Starting Wiring Diagram for Lexus SC 300 1998 List of elements for 3.0L, Starting Wiring Diagram for Lexus SC 300 1998: 31 (on transmission) Acc Alt fusible link 120a Am1 Am1 fusible link 100a Battery E15 E18 Engine control module (behind lower right side of dash) Fuse block (at left side of engine compartment, behind battery) I25 (dash harness, right side of dash) I26 (dash harness, lower 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 Nsw 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 300 1998 List of elements for Charging Wiring Diagram for Lexus SC 300 1998: 21 (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 300 1998 List of elements for Supplemental Restraint Wiring Diagram for Lexus SC 300 1998: 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 A/T Wiring Diagram for Lexus SC 300 1998 List of elements for A/T Wiring Diagram for Lexus SC 300 1998: 96 (dash harn, right side of dash) (dash harn, right side of dash) i17 (dash harn, top center of dash) (engine harn, left side of dash) (engine harn, right side of firewall) (engine harn, right side of firewall) e24 (front side of left fender) g100 (left rear side of cyl head) g114 +b1 1998 models 1999 models 2 ind 3 ind A/t indicator switch (park/neutral position switch (on top left side of transmission) A/t oil Accel position sensor (top center of engine) Batt D ind E01 E02 E03 E15 E16 E17 E18 E19 E21 E24 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 (left front side of eng) G206 (left instrument panel brace) Gauge fuse 10a H12 Hot at all times Hot in on or start I10 I25 I25 (dash harn, right side of dash) I27 I27 (dash harn, right side 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 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 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 (d - 3) (near gear selector) Vehicle speed sensor (on trans- mission) Vpa Vpa2 Vta Vta2
TRUNK, TAILGATE, FUEL DOOR Trunk, Tailgate, Fuel Door Wiring Diagrams for Lexus SC 300 1998 List of elements for Trunk, Tailgate, Fuel Door Wiring Diagrams for Lexus SC 300 1998: 18 +b2 Acc Cig fuse 15a Door fuse 30a Ecu-ig fuse 15a Fuel lid opener solenoid (at right side of luggage compartment) Fuel lid opener switch G200 (left kick panel) G316 (rear of right door sill) Hot at all times Hot in accy or run Hot in run Junction block 1 (behind left kick panel) Junction block 3 (behind center of dash) Luggage compartment door opener motor (center rear of trunk) Luggage compartment door opener switch Theft deterrent & door lock control ecu (behind instrument cluster) Tsw
WARNING SYSTEMS Warning System Wiring Diagrams for Lexus SC 300 1998 List of elements for Warning System Wiring Diagrams for Lexus SC 300 1998: 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 300 1998 List of elements for Wiper/Washer Wiring Diagram for Lexus SC 300 1998: 29 (dash harness, left end of dash) i2 C14 C15 C16 C25 Combination meter Combination switch D13 E12 G100 (front side of left fender) G200 (left kick panel) Gauge fuse 10a H16 High Hot in start or on Int Int. time Junction block 1 (behind left kick panel) Junction block 3 (behind center of dash) Low/ mist Off Solid state Washer level ind Washer level switch (at left front corner of engine compt) Washer motor (at left front corner of eng compt) Washer switch Wiper fuse 20a Wiper motor (left rear of eng compt) Wiper switch
