Lexus SC I (1991-2001) (dash harn, upper left end 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 BLK/RED WIRE BLU/BLK WIRE ECU-IG FUSE GRN/BLK WIRE GRN/RED WIRE HOT IN ON OR START INNER MIRROR JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LEFT REMOTE CONTROL MIRROR RED WIRE RIGHT REMOTE CONTROL MIRROR W/ MEMORY WHT/BLK WIRE

BLK WIRE COMBINATION METER COMBINATION SWITCH TURN SIGNAL SWITCH GRN WIRE GRN/BLK WIRE GRN/YEL WIRE HAZ-HORN FUSE 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 FRONT PARKING LIGHT LEFT FRONT SIDE MARKER LIGHT LEFT FRONT TURN LIGHT LEFT TURN SIGNAL IND LT GRN WIRE RED WIRE RED/BLK WIRE 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 FRONT PARKING LIGHT RIGHT FRONT SIDE MARKER LIGHT RIGHT FRONT TURN LIGHT RIGHT LEFT RIGHT TURN SIGNAL IND TURN FUSE TURN SIGNAL FLASHER WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL 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 (OR 2) A/C CONTROL ASSEMBLY ABS ECU ABS, TRACTION ECU BLK WIRE BLK/ WHT WIRE BLOWER MOTOR CONTROL RELAY BLU/BLK WIRE BLU/RED WIRE BRN WIRE CIGARETTE LIGHTER COMBINATION METER DATA LINK CONNECTOR 3 DRIVER'S POWER SEAT CONTROL SWITCH DRIVER'S SEAT SLIDE POSITION SENSOR DRIVING POSITION MEMORY, RETURN SWITCH ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT, SEAT HEATER SWITCHES ENGINE CONTROL MODULE ENGINE CONTROL MODULE (3.0L) FROM JUNCTION FRONT VERTICAL POSITION SENSOR DRIVER'S SEAT RECLINE MOTOR FUEL LID OPENER SOLENOID GLOVE BOX LIGHT SWITCH HIGH MOUNTED STOP LIGHT JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) JUNCTION CONNECTOR J/C 2 (CENTER OF REAR SHELF) LUGGAGE COMPARTMENT DOOR OPENER SWITCH PASSENGER'S SEAT BACK HEATER PASSENGERS POWER SEAT CONTROL SWITCH POWER SEAT ECU REAR VERTICAL POSITION SENSOR REAR WINDOW DEFOGGER RED/ WHT WIRE 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 W/ MEMORY W/O MEMORY WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE WIRELESS DOOR LOCK CONTROL ECU

1 2 3 4 5 6 IG 11 12 13 TAIL H-LP 3.0L 3.0L RIGHT LOW BEAM HEADLIGHT 4.0L AUTOMATIC LIGHT CONTROL SENSOR (LEFT SIDE OF DASH) BLK WIRE BLK/RED WIRE BLU/WHT WIRE BRN WIRE COMBINATION METER COMBINATION SWITCH CTY DAYTIME RUNNING LIGHT RELAY (MAIN) (ON J/B 1) DAYTIME RUNNING LIGHT RELAY 2 (BEHIND LEFT HEADLAMP) DAYTIME RUNNING LIGHT RELAY 3 (BEHIND LEFT HEADLAMP) DAYTIME RUNNING LIGHT RELAY 4 (BEHIND LEFT HEADLAMP) DIMMER SWITCH DRL FUSE ECU-IG FUSE ECU-B FUSE EXTERIOR LIGHTS SYSTEM (TAILLIGHT RELAY) FOG LIGHT RELAY FOGLIGHT SWITCH FUSE BLOCK (BEHIND BATTERY) GENERATOR GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/WHT WIRE GRN/YEL WIRE HEAD FUSE (LH-LWR) HEAD FUSE (RH-LWR) HEAD IND HEAD LH UPR FUSE HEAD RELAY HEAD RH UPR FUSE HF HI DIM HIGH BEAM IND HIGH FLASH LO TAIL HEAD AUTO OFF LIGHT CONTROL SWITCH HOT AT ALL TIMES HOT AT ALL TIMES HOT IN START OR RUN HOT AT ALL TIMES R/B 4 (BEHIND LEFT KICK PANEL, ON FRONT SIDE OF J/B 1) FOG FUSE J/B 1 (BEHIND LEFT KICK PANEL) J/B 1 (LEFT KICK PANEL) LEFT DOOR OPEN DETECTION SWITCH LEFT HIGH BEAM HEADLIGHT LEFT LOW BEAM HEADLIGHT LT GRN WIRE LT GRN/BLK WIRE MAIN FUSE PLOCK PKB LOCK CHG- PNK 1 2 3 4 5 6 7 8 9 WIRE PNK DOOR LOCKS SYSTEM WIRE PNK/BLK WIRE R/B 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) R/B 5 (BEHIND LEFT KICK PANEL, ON REAR SIDE OF J/B 1) RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RIGHT DOOR OPEN DETECTION SWITCH RIGHT FOG LIGHT LEFT FOG LIGHT RIGHT HIGH BEAM HEAD- LIGHT WHT WIRE WHT/BLK WIRE WHT/GRN WIRE WHT/RED WIRE YEL/BLK WIRE YEL/GRN WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 MHR MVR M+R +B HSRR VSRR 1 2 3 4 5 6 SWE SWRV SWB SWRH SWLH SWLV BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE 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 ECUE GRN WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HOT AT ALL TIMES RAD 2 FUSE ECU-B FUSE HOT IN ACC OR ON JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LEFT DOOR OPEN DETECTION SWITCH LEFT REMOTE CONTROL MIRROR LEFT RIGHT LEFT/ RIGHT UP/ DOWN LH SELECT SWITCH RH MHL MVL M+L GND MRY NCA WIRE OPERATION SWITCH PNK WIRE RED/BLK WIRE RED/WHT WIRE REMOTE CONTROL MIRROR ECU (BEHIND LEFT CENTER OF DASH) REMOTE CONTROL MIRROR SWITCH RIGHT LEFT RIGHT REMOTE CONTROL MIRROR SET- TILT, POWER TELESCOPIC ECU (BEHIND LEFT SIDE OF DASH) UP DOWN VC HSRL VSRL SI VIO WIRE WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 SO DSW 1 2 3 4 5 6 7 8 9 10 11 12 IG TEM+ TIM- +B ASW AUTO SW BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE DASH HARN, BEHIND COMBINATION METER) DOME FUSE DRIVER'S POWER SEAT ECU (UNDER DRIVER'S SEAT) DRIVER'S POWER SEAT ECU SHIELD DRIVING POSITION MEMORY, RETURN SWITCH (LEFT SIDE OF DASH) ECU-IG FUSE GAUGE FUSE GRN WIRE GRN/WHT WIRE HOT AT ALL TIMES HOT IN START OR RUN JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LEFT DOOR LOCK/ UNLOCK MOTOR, DOOR DETECTION POSITION SWITCH MANUAL SW MSW VC ECU-B NCA WIRE P (PKB) GND PARK/NEUTRAL POSITION SWITCH (ON TRANSMISSION) PNK WIRE PNK/BLK WIRE PNK/BLU WIRE POWER FUSE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) REMOTE CONTROL MIRROR ECU (BEHIND LEFT CENTER OF DASH) SET- SI SO SSR- TELESCO LONG TELESCO SHORT TELESCOPIC CONTROL MOTOR TELESCOPIC POSITION SENSOR TELESCOPIC POSITION SENSOR (BEHIND LEFT SIDE OF DASH) TES TIS ECUE SO UWSW MRY TILT CONTROL MOTOR TILT DOWN TILT POSITION SENSOR TILT UP TILT, POWER TELESCOPIC ECU (BEHIND LEFT SIDE OF DASH) TILT, POWER TELESCOPIC UNIT (COMBINATION SWITCH) TIM+ TEM- UNLOCK WARNING SWITCH (IGNITION SWITCH) VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE YEL WIRE YEL/GRN WIRE YEL/RED WIRE

3.0L 4.0L ABS MTR RELAY ABS SOL RELAY ALT FUSE (3.0L) (4.0L) BATTERY BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE DATA LINK CONNECTOR 3 DOME FUSE ENGINE CONTROL MODULE, PARK/NEUTRAL POSITION SWITCH FOG FUSE FOGLIGHT RELAY FUSE GENERATOR HAZ-HORN FUSE HORN RELAY, HAZARD SWITCH, THEFT DETERRENT HORN IG SW FUSE IGNITION MAIN RELAY IGNITION SWITCH INJ FUSE INTEGRATION RELAY JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) LOCK MAIN FUSE NCA WIRE OBD FUSE RADIO 1 FUSE RADIO 2 FUSE RED WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) REMOTE CONTROL MIRROR ECU REMOTE CONTROL MIRROR SWITCH SEAT HTR FUSE ST FUSE STARTER STEREO POWER AMPLIFIER, RADIO, PLAYER, AUTO ANTENNA MOTOR, RELAY, D/A CONVERTER TO CIG FUSE, JUNCTION BLOCK 1 (DIAGRAM 2 OF 3) TO DAYTIME RUNNING LIGHT RELAY 2 (DIAGRAM 3 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) WHT WIRE WHT/BLU WIRE WHT/RED WIRE

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