Lexus SC I (1991-2001) (dash harn, top center of dash) Wiring diagrams

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 GRD 1 2 3 4 5 6 7 8 9 10 TO ACT- ACT+ ACTD PRLY IG BLK WIRE BLK/ WHT WIRE BLK/RED WIRE BLK/WHT (OR RED/BLK) WIRE BLK/WHT WIRE BLU WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN (OR GRN/WHT) WIRE BRN/WHT WIRE BZR CIG FUSE DIODE DOME FUSE DOOR FUSE DSWD DSWL DSWP KSW LSWP ECU-IG FUSE ENGINE HOOD COURTESY SWITCH (CENTER FRONT OF ENGINE COMPARTMENT) GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HEADLIGHTS SYSTEM HORN RELAY HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR ACCY HOT IN RUN OR START INTEGRATION RELAY JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) KSW LSWD LSWP IG CTY LEFT FRONT DOOR KEY LOCK/UNLOCK SWITCH LOCK LUG HEAD SH IND TSW DSWH LSWD LUGGAGE COMPARTMENT LIGHT SWITCH (CENTER REAR OF TRUNK) MASTER POWER WINDOW/DOOR LOCK CONTROL SWITCH PNK WIRE POWER MAIN RELAY POWER CIRCUIT BREAKER RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) RIGHT FRONT DOOR KEY LOCK/UNLOCK SWITCH RIGHT FRONT DOOR LOCK CONTROL SWITCH STARTER RELAY TAIL HORN SRLY TAILLIGHT RELAY THEFT DETERRENT, DOOR LOCK ECU (BEHIND INSTRUMENT CLUSTER) UL +B UNLOCK VIO WIRE WHT (OR GRN) WIRE WHT WIRE WHT/BLK WIRE WIRELESS DOOR LOCK BUZZER (AT LEFT SIDE OF ENGINE COMPARTMENT, NEAR STRUT TOWER) YEL GRN/ WIRE YEL WIRE YEL/GRN WIRE YEL/RED WIRE

BLK WIRE BLU WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE COMBINATION METER GRN/WHT WIRE HAZ-HORN FUSE HORN RELAY HOT AT ALL TIMES JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LEFT LOCK/ UNLOCK MOTOR, DOOR DETECTION POSITION SWITCH LT GRN WIRE LUGGAGE COMPARMENT DOOR OPENER MOTOR (CENTER REAR OF TRUNK) LUGGAGE COMPARTMENT DOOR OPEN SWITCH LUGGAGE COMPARTMENT KEY UNLOCK SWITCH (RIGHT REAR OF TRUNK) PNK WIRE RED WIRE RED/WHT WIRE 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) VIO WIRE WHT WIRE WHT/BLK WIRE YEL 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

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

A/C CONTROL ASSEMBLY AIR BAG SENSOR ASSEMBLY BLK WIRE BLK/YEL WIRE COMBINATION METER (4.0L) COOLING FAN ECU (4.0L) DIMMER SWITCH (COMBINATION SWITCH) INNER MIRROR INTEGRATION RELAY JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LEFT DOOR KEY LOCK/ UNLOCK SWITCH LEFT DOOR LOCK/ UNLOCK MOTOR, DOOR DETECTION POSITION SWITCH 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 WIRE REMOTE CONTROL MIRROR ECU REMOTE CONTROL MIRROR SWITCH RIGHT VANITY LIGHT RIGHT VANITY LIGHT INNER MIRROR THEFT DETERRENT, DOOR LOCK ECU TILT, POWER TELESCOPIC ECU TO JUNCTION TRANSPONDER KEY AMPLIFIER TURN SIGNAL FLASHER W/ MEMORY W/O MEMORY W/O MOON W/ MOON ROOF ROOF WHT WIRE WHT/BLK WIRE WHT/GRN WIRE WHT/RED WIRE WIPER MOTOR IGNITION MAIN RELAY WIPER WASHER SWITCH (COMBINATION SWITCH)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 GRD 1 2 3 4 5 6 7 8 9 10 TO ACT- ACT+ ACTD PRLY IG BLK WIRE BLK/ WHT WIRE BLK/RED WIRE BLK/WHT (OR RED/BLK) WIRE BLK/WHT WIRE BLU WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN (OR GRN/WHT) WIRE BRN/WHT WIRE BZR CIG FUSE DIODE DOME FUSE DOOR FUSE DSWD DSWL DSWP KSW LSWP ECU-IG FUSE ENGINE HOOD COURTESY SWITCH (CENTER FRONT OF ENGINE COMPARTMENT) GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HEADLIGHTS SYSTEM HORN RELAY HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR ACCY HOT IN RUN OR START INTEGRATION RELAY JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) KSW LSWD LSWP IG CTY LEFT FRONT DOOR KEY LOCK/UNLOCK SWITCH LOCK LUG HEAD SH IND TSW DSWH LSWD LUGGAGE COMPARTMENT LIGHT SWITCH (CENTER REAR OF TRUNK) MASTER POWER WINDOW/DOOR LOCK CONTROL SWITCH PNK WIRE POWER MAIN RELAY POWER CIRCUIT BREAKER RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) RIGHT FRONT DOOR KEY LOCK/UNLOCK SWITCH RIGHT FRONT DOOR LOCK CONTROL SWITCH STARTER RELAY TAIL HORN SRLY TAILLIGHT RELAY THEFT DETERRENT, DOOR LOCK ECU (BEHIND INSTRUMENT CLUSTER) UL +B UNLOCK VIO WIRE WHT (OR GRN) WIRE WHT WIRE WHT/BLK WIRE WIRELESS DOOR LOCK BUZZER (AT LEFT SIDE OF ENGINE COMPARTMENT, NEAR STRUT TOWER) YEL GRN/ WIRE YEL WIRE YEL/GRN WIRE YEL/RED WIRE

BLK WIRE BLU WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE COMBINATION METER GRN/WHT WIRE HAZ-HORN FUSE HORN RELAY HOT AT ALL TIMES JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LEFT LOCK/ UNLOCK MOTOR, DOOR DETECTION POSITION SWITCH LT GRN WIRE LUGGAGE COMPARMENT DOOR OPENER MOTOR (CENTER REAR OF TRUNK) LUGGAGE COMPARTMENT DOOR OPEN SWITCH LUGGAGE COMPARTMENT KEY UNLOCK SWITCH (RIGHT REAR OF TRUNK) PNK WIRE RED WIRE RED/WHT WIRE 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) VIO WIRE WHT WIRE WHT/BLK WIRE YEL WIRE

ABS ECU (RIGHT SIDE OF DASH) BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/ YEL WIRE BLU/BLK WIRE BLU/RED WIRE BLU/YEL WIRE BRAIDED BRN 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 STOP FUSE HOT IN ON OR START JUNCTION BLOCK 1 JUNCTION BLOCK 1 OBD FUSE JUNCTION BLOCK 3 MALFUNCTION INDICATOR LIGHT ORG/ WIRE PNK 5 6 WIRE PNK WIRE PWR RED WIRE RED/ BLU WIRE RED/WHT WIRE RED/YEL WIRE SNOW STOPLIGHT SWITCH (ON BRAKE PEDAL BRACKET) VAPOR PRESSURE SENSOR (RIGHT FRONT CORNER OF ENGINE COMPT) WHT RED/ WIRE WHT WIRE WHT/ BLK WIRE WHT/ BLU WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE

1 2 5 6 7 8 AC STA TC STP 3 13 14 15 16 17 SLU+ SLN- SLT- PI OIL 18 23 26 PTNK CCS 4 5 6 7 8 9 10 PNK WIRE 9 10 EOM KSW TPC IMLD TXCT RXCK CODE AIR CONDITIONING SYSTEM ANTI-LOCK BRAKES SYSTEM ANTI-THEFT BLK WIRE 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 CRUISE CONTROL SYSTEM DATA LINK CONNECTOR 2 (1998) (LEFT SIDE OF DASH) ELECTRONICALLY CONTROLLED TRANSMISSION SOLENOID (IN TRANSMISSION) ENGINE CONTROL MODULE (BEHIND LOWER RIGHT SIDE OF DASH) GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HOT AT ALL TIMES RELAY BLOCK 2 ETCS FUSE IGSW MREL SIL TRC+ ENG+ NEO +B TRC- ENG- EC JUNCTION BLOCK 1 JUNCTION BLOCK 3 KEY UNLOCK WARNING SWITCH (BEHIND LEFT SIDE OF DASH) NCO ORG/ WIRE PNK WIRE PNK/BLU WIRE RED WIRE RED/ WHT WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RSPD SIL SLU+ SLN+ SLT+ NCO- PNK WIRE STI- PWR ACMG 12 13 16 TRANSPONDER KEY AMPLIFIER (BEHIND LEFT SIDE OF DASH) VSV (VAPOR PRESSURE SENSOR) (RIGHT FRONT CORNER OF ENGINE COMPT) WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK 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