Lexus SC I (1991-2001) junction block 3 (behind center of dash) Wiring diagrams

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 SFRR SFRH 1 2 3 4 5 6 7 8 9 10 11 12 MR FL- FR+ AST SFLH SFLR SR FL+ FR- MT SRH SRR ABS ACTUATOR (AT RIGHT REAR CORNER OF ENGINE COMPT) ABS ECU (BEHIND RIGHT SIDE OF DASH) ABS INDICATOR ABS MOTOR RELAY BLK WIRE BLK/YEL WIRE BLU WIRE BLU/WHT WIRE BRAIDED COMBINATION METER DATA LINK CONNECTOR 1 DATA LINK CONNECTOR 2 (BEHIND LEFT SIDE OF DASH) ECU-IG FUSE GAUGE FUSE GRN WIRE GRN/RED WIRE GRN/WHT WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN J/B 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LEFT FRONT ABS SPEED SENSOR (LEFT FRONT WHEEL ASSEMBLY) LT GRN WIRE PNK/BLK WIRE R/B 6 (ON LEFT SIDE OF ENGINE COMPT, BEHIND STRUT TOWER) ABS SOL RELAY RED WIRE RED/YEL WIRE RIGHT REAR ABS SPEED SENSOR (RIGHT REAR WHEEL ASSEMBLY) STOP FUSE STOPLIGHT SWITCH (ON BRACKET, ABOVE BRAKE PEDAL) TC RL- RR+ WA TS RL+ RR- D/G 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 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

BLU/WHT WIRE BRN/WHT WIRE COMBINATION METER DOME FUSE DOOR DOOR OPEN WARNING LIGHT GAUGE FUSE GRN/BLU WIRE HOT AT ALL TIMES HOT IN ON OR ACC HOT IN ON OR START IGNITION KEY CYLINDER LIGHT INTEGRATION RELAY INTERIOR JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LEFT DOOR COURTESY LAMP LEFT DOOR UNLOCK, DOOR OPEN DETECTION SWITCH LEFT VANITY LIGHT LUGGAGE COMPARTMENT LAMP LUGGAGE COMPARTMENT LIGHT SWITCH MAP OFF PERSONAL LIGHT PNK WIRE RADIO 2 FUSE RED WIRE RED/BLK WIRE RED/WHT WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPARTMENT BEHIND BATTERY) RELAY BLOCK 4 (BEHIND LEFT KICK PANEL, ON FRONT SIDE OF JUNCTION BLOCK 1) RIGHT DOOR COURTESY LAMP RIGHT DOOR UNLOCK, DOOR OPEN DETECTION SWITCH RIGHT VANITY LIGHT STEP LIGHT WHT/BLK WIRE

BLK WIRE BLK/RED WIRE BLU RED/ WIRE BLU WIRE BLU/RED WIRE DEF FUSE DEFOGGER RELAY HEATER HOT AT ALL TIMES HOT IN ON OR START HTR FUSE JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LEFT REMOTE CONTROL MIRROR MIR HTR FUSE NOISE FILTER (AT LEFT SIDE OF ENGINE COMPT, NEAR FUSE BLOCK) RDFGR REAR WINDOW DEFOGGER REAR WINDOW DEFOGGER SWITCH (A/C CONTROL ASSEMBLY) RED WIRE RED/ BLU WIRE RED/BLU WIRE RELAY BLOCK 2 (ON LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) RIGHT REMOTE CONTROL MIRROR WHT/ BLK WIRE WHT/BLK WIRE YEL/RED WIRE

AUTO AUTOMATIC LIGHT CONTROL SENSOR BLK WIRE BLU WIRE BRN WIRE COMBINATION METER COMBINATION SWITCH DIODE FUSE BLOCK (AT LEFT SIDE OF ENGINE COMPARTMENT, BEHIND BATTERY) FUSIBLE LINK GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE HEAD HOT AT ALL TIMES HOT IN ON OR START INTEGRATION RELAY (LEFT SIDE OF DASH) JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LEFT REAR COMBINATION LIGHT LICENSE PLATE LIGHT LIGHT LIGHT FAILURE SENSOR (LEFT REAR SIDE OF LUGGAGE COMPARTMENT) OFF TAIL REAR LIGHT WARNING LIGHT RED WIRE RED/WHT WIRE RIGHT REAR COMBINATION LIGHT STOP FUSE STOP LIGHT STOPLIGHT SWITCH (NEAR BRAKE PEDAL) TAIL FUSE TAIL LIGHTS TAILLIGHT RELAY TURN SIGNAL VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE YEL WIRE YEL/GRN 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

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

A/C CONTROL ASSEMBLY (BEHIND CENTER OF DASH) TC A/C CONTROL, RADIO SWITCH LAMP A/T SHIFT LEVER ILLUMINATION LAMP BLK WIRE BLU WIRE BRN WIRE CIGARETTE LIGHTER LAMP COMBINATION METER TAIL ELECTRONIC CONTROLLED TRANSMISSION PATTERN SELECT, SEAT HEATER SWITCH FUSE BLOCK (AT LEFT SIDE OF ENGINE COMPT, BEHIND BATTERY) FUSIBLE LINK GLOVE BOX LAMP) GLOVE BOX LIGHT SWITCH GRN WIRE GRN/ORG WIRE GRN/RED WIRE GRN/YEL WIRE HAZARD SWITCH LAMP HEAD OFF TAIL HOT AT ALL TIMES INTEGRATION RELAY (ON JUNCTION BLOCK 1) JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) LIGHT CONTROL SWITCH (PART OF COMBINATION SWITCH) LT GRN WIRE LT GRN/RED WIRE ORG/ WIRE PANEL FUSE RADIO, PLAYER LAMP RE RL RV RED WIRE RHEOSTAT SOLID STATE TAILLIGHT RELAY TRIP SWITCH, THEFT DETERRENT WHT WIRE WHT/BLK WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE

A/C CONTROL ASSEMBLY, SHIFT LOCK ECU AIR BAG SENSOR ASSEMBLY BLK/WHT WIRE BLK/YEL WIRE BLU/RED WIRE BLU/WHT WIRE CIG FUSE CIGARETTE LIGHTER DIODE DOOR FUSE ECU-B FUSE ECU-IG FUSE ENGINE CONTROL MODULE, LICENSE PLATE LIGHTS, LIGHT FAILURE SENSOR ENGINE CONTROLS SYSTEM ENGINE FUSE FROM IGNITION SWITCH (DIAGRAM 1 OF 3) FROM RAD 2 FUSE, JUNCTION BLOCK 1 (DIAGRAM 1 OF 3) GAUGE FUSE GENERATOR HAZARD SWITCH HTR FUSE HTR RELAY, MG CLT RELAY DEF RELAY, A/C CONTROL ASSEMBLY, WATER VALVE VSV IGN FUSE INTEGRATION RELAY JUNCTION BLOCK 1 (BEHIND LEFT KICK PANEL) JUNCTION BLOCK 3 (BEHIND CENTER OF DASH) PANEL FUSE PARKING LIGHTS, FRONT SIDE MARKER LIGHTS POWER MAIN RELAY PWR FUSE STOP FUSE TAIL FUSE TAILLIGHT RELAY THEFT DETERRENT, DOOR LOCK CONTROL ECU, AIR BAG SENSOR ASSEMBLY TILT, POWER TELESCOPIC ECU, MOON ROOF CONTROL RELAY TURN FUSE WASHER MOTOR, WIPER/WASHER SWITCH, WIPER MOTOR WHT/BLK WIRE WHT/BLU WIRE WIPER FUSE

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