Lexus SC I (1991-2001) j/b 3 (behind center of dash) Wiring diagrams

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 RL- RR+ 20 22 21 14 20 15 TRC- NEO EFI- EFI+ ABS ABS, TRACTION ECU (ABOVE BASE OF RIGHT B-PILLAR) BLK WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BLU/WHT WIRE BRAIDED BRAIDED BRAIDED BRAKE FLUID LEVEL SWITCH (IN BRAKE FLUID RESERVOIR) BRN WIRE COMBINATION METER ECU-IG FUSE ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) GAUGE FUSE GRN WIRE GRN/WHT WIRE HOT AT ALL TIMES HOT IN RUN J/B 1 (BEHIND LEFT KICK PANEL) J/B 3 (BEHIND CENTER OF DASH) JUNCTION CONNECTOR J/C 2 (CENTER OF REAR SHELF) LBL+ EFI+ CSW LBL- EFI- LT GRN WIRE LT GRN/RED WIRE NEO STP PARKING BRAKE SWITCH (AT BASE OF PARKING BRAKE LEVER) PNK/BLU WIRE RED WIRE RED/WHT WIRE RL RR STOP FUSE STOPLIGHT SWITCH (ON BRAKE PEDAL SUPPORT) STP, BK TRAC TRAC OFF TRACTION CUT SWITCH TRC+ VIO WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE YEL WIRE YEL/RED WIRE

+B MH MC MFRS MREC IG+ TR MFACE MDEF A/C CONTROL ASSEMBLY A/C SOLAR SENSOR (AT UPPER RIGHT SIDE OF DASH) AIR INLET CONTROL SERVO MOTOR (BEHIND RIGHT SIDE OF DASH) AIR MIX CONTROL SERVO MOTOR (BEHIND RIGHT SIDE OF DASH) AIR VENT MODE CONTROL SERVO MOTOR (BEHIND CENTER OF DASH) AMOUT REOST WV MGC TC TAIL BLK WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BLW HR RDFGR CFAN BRN WIRE BRN/WHT WIRE DEF FACE DEFOGGER SYSTEM FR RECIRC GRN WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE HOT COOL IGN A/C IN IGNITER (ON LEFT SIDE OF LEFT STRUT TOWER) INSTRUMENT CLUSTER SYSTEM INTERIOR LIGHTS SYSTEM (RHEOSTAT) J/B 1 (BEHIND LEFT KICK PANEL) J/B 3 (BEHIND CENTER OF DASH) LOCK IN SAUT LP LT GRN WIRE LT GRN/RED WIRE LT SC 300 ONLY ORG/ WIRE PNK 22 23 24 25 WIRE RED WIRE RED/BLU WIRE RED/YEL WIRE SC 400 ONLY SG TEL IN TP TPI SPD TPM TACH TEL TR TAM TE TW TS PNK WIRE VER VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/GRN WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

1 2 3 4 5 6 7 8 9 10 IGB SOL+ SOL- A/C ACMG IDL A/C CONTROL SWITCH, RADIO SWITCH A/C EVAPORATOR TEMP. SENSOR (BEHIND RIGHT SIDE OF DASH) A/C MAGNETIC CLUTCH (ON A/C COMPRESSOR) A/C ROOM TEMPERATURE SENSOR (BEHIND CENTER OF DASH) AUTO BLK WIRE BLK/RED WIRE BLK/YEL WIRE BLOWER MOTOR (BEHIND RIGHT SIDE OF DASH) BLOWER MOTOR CONTROL RELAY (BEHIND RIGHT SIDE OF DASH) BLU WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE CIG FUSE COOLING FAN ECU (SC 400) (BEHIND RIGHT SIDE OF DASH) DATA LINK CONNECTOR 1 (DLC) (PARTIAL) (AT LEFT REAR SIDE OF ENGINE) DEF RELAY ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) GND B+ SI GRN WIRE GRN/ORG WIRE GRN/YEL WIRE HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ON OR START HOT IN ON OR START ECU-IG FUSE HOT W/LIGHT SWITCH IN TAIL OR HEAD HTR FUSE HTR RELAY IDL TAC COOL HP TH+ TH- INSTRUMENT CLUSTER SYSTEM J/B 1 (BEHIND LEFT KICK PANEL) J/B 3 (BEHIND CENTER OF DASH) LT GRN WIRE LT GRN/RED WIRE MG CLT RELAY ORG/ WIRE PANEL FUSE PNK 22 23 24 25 WIRE PNK WIRE R/B 2 (ON LEFT SIDE OF ENGINE COMPARTMENT, BEHIND BATTERY) R/B 2 (ON LEFT SIDE OF ENGINE COMPARTMENT, BEHIND BATTERY) DOME FUSE RADIO TEMP CONTROL SWITCH RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE SC 300 SC 400 SOLENOID VALVE (COOLING FAN) (SC 400) (AT LEFT FRONT OF ENGINE) VIO WIRE VIO/WHT WIRE VSV (WATER VALVE) (ON RIGHT SIDE OF FIREWALL) WHT WIRE WHT/BLK WIRE WHT/GRN WIRE YEL WIRE YEL/BLK WIRE

1 7 8 9 10 16 BATT +BM 5 11 12 PNK WIRE 5 6 23 TC STP CCS A/D A/T INDICATOR SWITCH ACCEL POSITION SENSOR (TOP CENTER OF ENGINE) BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/YEL WIRE BRAIDED BRN WIRE CL- COMBINATION METER CRUISE CONTROL SWITCH CRUISE IND EFI FUSE EFI MAIN RELAY ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) ETCS FUSE GRN WIRE GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES HOT AT ALL TIMES IGN FUSE STOP FUSE HOT IN ON OR START GAUGE FUSE IGSW MREL +B J/B 3 (BEHIND CENTER OF DASH) JUNCTION BLOCK 1 LEFT SIDE OF ENGINE COMPRT.) M- M+ MAIN PNK WIRE PNK/BLK WIRE RED WIRE RED YEL/ WIRE RED/BLU WIRE RED/YEL WIRE RELAY BLOCK 2 RES+ SET/ COAST STOPLIGHT SWITCH (ON BRACKET, ABOVE BRAKE PEDAL) THROTTLE CONTROL MOTOR (ON THROTTLE BODY) THROTTLE POSITION SENSOR (ON THROTTLE BODY) VC CL- VEHICLE SPEED SENSOR 2 (ON TRANSMISSION) VIO WIRE WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

ABS ECU (BEHIND RIGHT SIDE OF DASH) ABS, TRACTION ECU (ABOVE BASE OF RIGHT B-PILLAR) BLK WIRE BLK/RED WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE COMBINATION METER (UNDER LEFT SIDE OF ASHTRAY) ECU-IG FUSE GAUGE FUSE HOT IN ON OR START IG SPD J/B 1 (BEHIND LEFT KICK PANEL) J/B 3 (BEHIND CENTER OF DASH) LT GRN WIRE ORG/ WIRE PPS ECU (BEHIND RIGHT SIDE OF DASH) PPS SOLENOID (AT LEFT FRONT OF ENGINE) RED WIRE SOL- SOL+ W/ TRACTION CONTROL W/O TRACTION CONTROL WHT WIRE WHT/BLK WIRE YEL WIRE YEL/GRN WIRE

A/C AND ELECTRONIC POWER STEERING SYSTEMS A/C CONTROL ASSEMBLY ABS IND. ANTI-LOCK BRAKE SYSTEM BLK WIRE BLK/ORG WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRAKE IND BRN WIRE CHARGE IND COMBINATION METER CRUISE IND DOOR IND DRIVE MONITOR ECU-B FUSE ENGINE CONTROLS SYSTEM ENGINE CONTROLS SYSTEM EXTERIOR LIGHTS SYSTEM (TURN FLASHER) FUEL FUEL INJECTOR 1 FUEL SENDER (IN FUEL TANK) GRN WIRE GRN/ YEL WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HEAD IND HEAD- LIGHTS SYSTEM HIGH BEAM IND HOT AT ALL TIMES HOT IN ON OR START HOT IN RUN GAUGE FUSE HOT WITH TAILLIGHT RELAY ENERGIZED IGN FUSE ILLUMINATION J/B 1 (LEFT SIDE OF DASH) J/B 3 (BEHIND CENTER OF DASH) J/B 3 (CENTER OF DASH) LEFT TURN IND LOW FUEL IND LT GRN WIRE LT GRN/RED WIRE MALFUNCTION IND OIL IND OIL LEVEL IND OIL PRESSURE SWITCH (LEFT SIDE OF ENG) ORG/ WIRE PANEL FUSE PNK/BLU WIRE POWER IND REAR LT IND RED WIRE RED/BLK WIRE RED/WHT WIRE RED/YEL WIRE RHEOSTAT RIGHT TURN IND SEAT BELT IND SNOW IND SPEEDOMETER/ ODOMETER/ TRIPMETER SRS IND STARTING/ CHARGING SYSTEM (GENERATOR) SUPPLEMENTAL RESTRAINTS SYSTEM TRAC IND TRAC OFF IND VIO WIRE VIO/WHT WIRE WARNING SYSTEM WASHER LEVEL IND WATER TEMP WATER TEMPERATURE SENDER WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

A/B A/T INDICATOR SWITCH ANTI-THEFT SYSTEM BLK WIRE BLK/WHT WIRE BLU WIRE BLU/YEL WIRE CLOCK/ OUTSIDE TEMP COOLING FAN ECU DOME FUSE ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) ENGINE CONTROLS SYSTEM ENGINE OIL LEVEL WARNING SWITCH (LEFT SIDE OF ENGINE) GRN WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES TRIP SWITCH, THEFT DETERRENT INDICATOR LIGHT HOT IN START IGNITER (3.0L) (LEFT SIDE OF LEFT STRUT TOWER) J/B 1 (LEFT KICK PANEL) J/B 1 (LEFT SIDE KICK PANEL) J/B 3 (BEHIND CENTER OF DASH) J/B 3 (CENTER OF DASH) LT GRN WIRE OIL TEMP OIL LEVEL P/N PARK/ NEUTRAL POSITION SWITCH (ON TRANSMISSION) PNK/BLU WIRE R/B 2 (LEFT SIDE OF ENG COMPT) RED WIRE RED/BLK WIRE RED/WHT (OR WHT) WIRE RED/WHT WIRE RED/YEL WIRE RESET+ SET- SHORT CONNECTOR ST FUSE STARTER RELAY THEFT TRIP VIO WIRE VIO/WHT WIRE W/O TRACTION CONTROL WASHER FLUID LEVEL SWITCH (LEFT FRONT OF ENGINE COMPT) WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

AIR BAG SENSOR ASSEMBLY (BEHIND CENTER OF DASH, FORWARD OF CENTER CONSOLE) AIR BAG SQUIB (FRONT PASSENGER AIR BAG ASSEMBLY) AIR BAG SQUIB (STEERING WHEEL PAD) BLK/ORG WIRE BLK/YEL WIRE BLU WIRE CIG FUSE COMBINATION METER DATA LINK CONNECTOR (DLC) 2 (PARTIAL) (BEHIND LEFT SIDE OF DASH) 4 12 ECU-B FUSE GRY WIRE HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ON OR START IGN FUSE J/B 1 (BEHIND LEFT KICK PANEL) J/B 3 (BEHIND CENTER OF DASH) LA D- D+ TC P+ P- PNK/BLK WIRE PNK/BLU WIRE RED WIRE SRS WARNING LIGHT WHT RED/ WIRE WHT WIRE WHT/BLK WIRE YEL BLK/ WIRE YEL WIRE

BLK WIRE BLK/RED WIRE BLU WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE CIG FUSE DOOR FUSE ECU-IG FUSE FUEL LID OPENER SOLENOID (AT RIGHT SIDE OF LUGGAGE COMPARTMENT) FUEL LID OPENER SWITCH HOT AT ALL TIMES HOT IN ACCY OR RUN J/B 1 (BEHIND LEFT KICK PANEL) J/B 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 WHT/BLK WIRE WHT/RED WIRE

BLK/YEL WIRE COMBINATION METER GAUGE FUSE HOT AT ALL TIMES R/B 2 (LEFT SIDE OF ENG COMPT) DOME FUSE HOT IN START OR ON 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 RED WIRE RED/WHT WIRE SEAT BELT WARNING LIGHT TIMER/BUZZER UNLOCK WARNING SWITCH (IN IGNITION SWITCH) VIO WIRE WHT/BLK WIRE YEL WIRE