Lexus SC I (1991-2001) junction block 1 (behind left kick panel) Wiring diagrams

ALT FUSIBLE LINK BATTERY BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLU/ORG WIRE ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) NSW FUSE BLOCK (AT LEFT SIDE OF ENGINE COMPARTMENT, BEHIND BATTERY) FUSIBLE LINK GRN WIRE GRN/RED WIRE IGNITION SWITCH IGSW FUSE JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) ST FUSE LOCK MAIN FUSIBLE LINK NCA WIRE PARK/ NEUTRAL POSITION SWITCH RED WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) STARTER RELAY RUN WIRE STARTER MOTOR THEFT DETERRENT, DOOR LOCK CONTROL ECU (BEHIND INSTRUMENT CLUSTER) SRLY WHT WIRE WHT/BLU WIRE

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

3.0L 3.0L, 4.0L 4.0L ALT FUSIBLE LINK ALT SENSING FUSE BATTERY BLK WIRE BLK/ORG WIRE BLK/YEL WIRE CHARGING WARNING LIGHT COMBINATION METER ENGINE FUSE FUSE BLOCK (AT LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) GENERATOR GRN/WHT WIRE HOT IN RUN OR START IGN FUSE JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) MAIN FUSIBLE LINK NCA WIRE RELAY BLOCK 2 (ON LEFT OF ENGINE COMPT, BEHIND BATTERY) STARTING CIRCUIT WHT BLK/YEL WIRE WHT WIRE YEL/GRN WIRE

BLU WIRE BLU/BLK WIRE BLU/WHT WIRE BLU/YEL WIRE DOOR FUSIBLE LINK 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 GRN WIRE GRN/RED WIRE HOLD HOT AT ALL TIMES JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LUMBAR SUPPORT REAR RECLINING RELEASE SLIDE VERTICAL FRONT VERTICAL REAR WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

BLK WIRE BLK/RED WIRE BLU WIRE DRIVER'S SEAT HEATER (IN SEAT BACK) DRIVER'S SEAT HEATER (IN SEAT CUSHION) ECU-IG FUSE 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) FUSIBLE LINK GRN WIRE HOT AT ALL TIMES HOT IN ON OR START IGNITION MAIN RELAY JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LEFT RED WIRE RELAY BLOCK 4 (BEHIND LEFT KICK PANEL, ON FRONT SIDE OF JUNCTION BLOCK) RIGHT SEAT HEATER SWITCH SEAT HTR FUSE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE YEL WIRE

BLK WIRE BLU WIRE BRN WIRE DOWN GRY WIRE HOT IN ACC OR ON RADIO 2 FUSE JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 1 (LEFT KICK PANEL) LEFT LEFT REMOTE CONTROL MIRROR LEFT/ RIGHT UP/ DOWN LT GRN WIRE LT GRN/RED WIRE RED WIRE REMOTE CONTROL MIRROR SWITCH RH LH RIGHT RIGHT LEFT RIGHT REMOTE CONTROL MIRROR SELECT SWITCH UP OPERATION SWITCH WHT/BLK WIRE YEL WIRE

BLK WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE CLOSE OPEN DOME FUSE DOOR FUSE DOOR OPEN DETECTION SWITCH LH DOOR OPEN DETECTION SWITCH RH ECU-IG FUSE HOT AT ALL TIMES HOT IN ON OR START JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LT GRN WIRE 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 PNK WIRE PNK/BLU WIRE POWER FUSE POWER MAIN RELAY RED WIRE RED/BLK WIRE RED/WHT WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) THEFT DETERRENT, DOOR LOCK CONTROL ECU (BEHIND INSTRUMENT CLUSTER) UP DOWN VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/YEL WIRE YEL WIRE YEL/RED WIRE

BLK RED/ WIRE BLU RED/ WIRE BLU WIRE BLU/ YEL WIRE BLU/RED WIRE CIG FUSE DOFF ECU-IG FUSE ENGINE CONTROLS SYSTEM GAUGE FUSE GRN WIRE GRN/ WHT WIRE GRN/BLK WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES HOT IN ACC OR RUN HOT IN RUN OR START IG STP 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 SOLENOID SLS+ SLS- STOP FUSE STOP LIGHT SWITCH (ON BRACKET, ABOVE BRAKE PEDAL) TRANSMISSION SYSTEM VIO WIRE WHT RED/ WIRE WHT WIRE WHT/ BLK WIRE WHT/BLK WIRE WHT/BLU WIRE YEL GRN/ WIRE

BLU RED/ WIRE BLU WIRE BLU/ WHT WIRE COMBINATION METER COMBINATION SWITCH GAUGE FUSE GRN WIRE GRN/RED WIRE HIGH OFF HOT IN START OR ON INT TIME JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) WIPER FUSE JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LOW/ MIST INT OFF PNK/BLU WIRE RED WIRE RED/ BLU WIRE 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 WHT WIRE WHT/BLK WIRE WHT/RED WIRE WIPER MOTOR (LEFT SIDE OF FIRE- WALL) WIPER SWITCH YEL WIRE

3 4 5 6 7 8 9 10 PNK WIRE ABS ECU (RIGHT SIDE OF DASH) BLK WIRE BLK/ WHT WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU RED/ WIRE BLU WIRE BLU/ WHT WIRE BLU/ YEL WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRAIDED BRN WIRE BRN/WHT WIRE COMBINATION METER ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT SWITCH GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES HOT IN ON OR START JUNCTION BLOCK 1 JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) MALFUNCTION INDICATOR LIGHT PNK WIRE PWR RED WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE SNOW STOP FUSE OBD FUSE STOPLIGHT SWITCH (ON BRACKET, ABOVE BRAKE PEDAL) VAPOR PRESSURE SENSOR (UNDER RIGHT REAR OF VEHICLE, NEAR WHEELWELL) WHT WIRE WHT/ BLK WIRE WHT/ BLU WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL BLU/ WIRE YEL WIRE YEL/GRN WIRE