Lexus SC I (1991-2001) (engine harn, center of firewall) Wiring diagrams

1 2 3 4 PWRL 1 2 3 8 9 10 16 BATT SNWL SNWI 2 IND 3 IND 4 IND 6 11 15 20 STP PWR A/T OIL TEMP ACCELERATOR POSITION SENSOR (RIGHT REAR OF ENGINE) BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE D IND EFI FUSE EFI MAIN RELAY ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT SWITCH ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID (IN TRANSMISSION) ENGINE CONTROL MODULE ENGINE CONTROLS (COMBINATION METER) ENGINE COOLANT TEMPERATURE SENSOR (RIGHT FRONT OF ENGINE) GAUGE FUSE GRN WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HOT AT ALL TIMES HOT IN ON OR START IGN FUSE IGSW MREL +B INSTRUMENT PANEL J/B (LEFT SIDE OF DASH) JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) L IND LT GRN WIRE N IND NCO+ PNK WIRE NO. 1 NO. 2 NO. 3 NO. 4 O/D DIRECT CLUTCH SPEED SENSOR (ON TRANS- MISSION) OIL ORG/ WIRE P IND PNK WIRE PWR IND R IND R/B 2 (LEFT SIDE OF ENGINE COMPT) RED WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE SLN- SLT- SLU+ SLU+ SLN+ SLT+ NCO- SLU- SLN- SLN- SLT- SNOW IND STARTING/ CHARGING SYSTEM STOP FUSE STOPLIGHT SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (ON THROTTLE BODY) TRANSMISSION CONTROL SWITCH (2 - L) (NEAR GEAR SELECTOR) TRANSMISSION CONTROL SWITCH (D - 4) (NEAR GEAR SELECTOR) VEHICLE SPEED SENSOR (ON TRANS- MISSION) VIO WIRE VTA THW WHT (OR GRN) WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE YEL/RED 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

4.0L BRN WIRE COMBINATION METER CRUISE CONTROL SWITCH D/A CONVERTER DATA LINK CONNECTOR 2 DATA LINK CONNECTOR 3 DRIVER'S POWER SEAT CONTROL SWITCH DRIVER'S POWER SEAT ECU DRIVER'S SEAT HEATER ENGINE CONTROL MODULE ENGINE OIL LEVEL WARNING SWITCH DATA LINK CONNECTOR 1 FUEL PUMP FUEL PUMP ECU 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 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 LICENSE PLATE LIGHT LIGHT FAILURE SENSOR LUGGAGE COMPARTMENT KEY UNLOCK SWITCH NCA WIRE PIONEER PLAYER RADIO RED/ WHT WIRE STEREO POWER AMPLIFIER STEREO POWER AMPLIFIER CD AUTOMATIC CHANGER W/ MEMORY WHT/BLK WIRE WHT/RED WIRE

ACIS BRAIDED BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRAIDED BRN WIRE CAMSHAFT POSITION SENSOR (LEFT FRONT OF ENGINE) CRANKSHAFT POSITION SENSOR (LEFT FRONT OF ENGINE) ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) EVG GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRN/WHT WIRE IGNITION COIL, IGNITER 1 IGNITION COIL, IGNITER 2 IGNITION COIL, IGNITER 3 IGNITION COIL, IGNITER 4 IGNITION COIL, IGNITER 5 IGNITION COIL, IGNITER 6 IGNITION COIL, IGNITER 7 IGNITION COIL, IGNITER 8 INSTRUMENT CLUSTER SYSTEM KNKR KNKL OCV- OCV+ KNOCK SENSOR 1 (TOP CENTER OF ENGINE) KNOCK SENSOR 2 (TOP CENTER OF ENGINE) LEFT CAMSHAFT TIMING OIL CONTROL VALVE (LEFT FRONT OF ENGINE) LEFT VVT SENSOR (TOP LEFT SIDE OF ENGINE) (LEFT CYLINDER HEAD) LT GRN WIRE MASS AIRFLOW METER (IN AIR INTAKE DUCT) NE- NE+ NOISE FILTER (LEFT REAR CORNER OF ENGINE) PNK WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RIGHT VVT SENSOR (TOP RIGHT SIDE OF ENGINE) THROTTLE CONTROL MOTOR (ON THROTTLE BODY) VC HTR HTL 1 2 PRG CL- VPA THA VVR- VVL- VSV (ACIS) (TOP REAR OF ENGINE) VSV (EVAP) (TOP REAR OF ENGINE) VTA THW VVR+ VVL+ WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE YEL/RED WIRE

3 4 5 6 7 8 9 10 PNK WIRE ACCEL POSITION SENSOR (TOP CENTER OF ENGINE) BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BRAIDED BRN WIRE EFI FUSE EFI MAIN RELAY ENGINE COOLANT TEMPERATURE SENSOR (RIGHT FRONT TOP OF ENGINE) FPC GRN WIRE GRN/RED WIRE HOT AT ALL TIMES HTL HTR IGN FUSE IGNITION SWITCH INJECTOR 1 INJECTOR 2 (ENGINE HARN, RIGHT SIDE OF FIREWALL) INJECTOR 3 INJECTOR 4 INJECTOR 5 INJECTOR 6) INJECTOR 7 (-) INJECTOR 8 (-) JUNCTION BLOCK 1 ST FUSE LOCK ON LT GRN WIRE P/N PARK/NEUTRAL POSITION SWITCH (ON TRANSMISSION) PNK WIRE RED WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) SHORT CONNECTOR (RIGHT SIDE OF DASH) STARTING/ CHARGING SYSTEM INSTRUMENT CLUSTER SYSTEM THROTTLE POSITION SENSOR (ON THROTTLE BODY) TRANSMISSION CONTROL SWITCH WHT WIRE WHT/BLK WIRE WHT/BLU WIRE YEL WIRE YEL/RED WIRE