Lexus SC II (2001-2005) engine control module (at left side of engine compt, in ecu box) Wiring diagrams

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 SRLR 1 2 3 VCM PMC 19 29 30 9 18 ENG+ TRC- ENG- NEO TRC+ ABS 1 FUSE ABS 2 FUSE ABS MTR RELAY ABS SOL RELAY BLK WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/WHT WIRE BLU/YEL WIRE BRAKE ACTUATOR BRAKE FLUID LEVEL WARNING SWITCH (IN BRAKE FLUID RESERVOIR) BRN WIRE EE (REAR OF LEFT FENDER) ENG+ LBL LBL TRC- SOL+ ENG- NEO TRC+ SOL- ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE ROOM 1 R/B (ON RIGHT SIDE OF ENGINE COMPT, BEHIND STRUT TOWER) ENGINE ROOM 2 R/B (ON LEFT SIDE OF ENGINE COMPT, FORWARD OF STRUT TOWER) FR- FR+ FL- FL+ FSS GRN WIRE GRN/RED WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE HOT AT ALL TIMES IF (AT LEFT KICK PANEL) JUNCTION CONNECTOR 8 (BEHIND LEFT END OF DASH) LT GRN WIRE MASTER CYLINDER PRESSURE SENSOR (AT LEFT REAR CORNER OF ENGINE COMPT) MT- SR MTT MT+ NCA WIRE PNK WIRE PPS SOLENOID (AT RIGHT FRONT OF ENGINE) RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE SFLH PMC SFLR SRRH SRRR VCM PH SFRH SRLH AST SFRR PL SHORT PIN 3 SKID CONTROL ECU (BEHIND LEFT END OF DASH) STR+ TRC MOTOR RELAY VIO WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

1 3 VZ GND 3 1 VZ (GND) GND (VZ) 3 1 VZ GND A/C AMBIENT TEMPERATURE SENSOR (AT CENTER OF FRONT BUMPER, BEHIND GRILLE) A/C COMP RELAY A/C FUSE A/C MAGNETIC CLUTCH, LOCK SENSOR (ON A/C COMPRESSOR) ACMG AIR BAG AIR INLET CONTROL SERVO MOTOR (BEHIND RIGHT SIDE OF DASH) AIR MIX CONTROL SERVO MOTOR (DRIVER SIDE) (BEHIND LEFT CENTER SIDE OF DASH) AIR MIX CONTROL SERVO MOTOR (PASSENGER SIDE) (BEHIND RIGHT CENTER SIDE OF DASH) AIR VENT MODE SERVO MOTOR (BEHIND CENTER OF DASH) BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BRN WIRE COMPUTER DATA LINES SYSTEM DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) EC (LEFT SIDE OF CYLINDER ED (REAR OF LEFT FENDER) ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ETAM FAN RELAY GND(S) GND(M) GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HEAD HOT AT ALL TIMES HOT IN ACC OR ON HTR RELAY IF (AT LEFT KICK PANEL) II (ON LEFT SIDE DASH BRACE) JUNCTION CONNECTOR 14 JUNCTION CONNECTOR 3 (IN ENGINE ROOM 2 R/B) JUNCTION CONNECTOR 7 (IN ECU BOX) JUNCTION CONNECTOR 8 (BEHIND LEFT END OF DASH) LCKI MCOOL MHOT MPOS 1 MPOS 2 MPOS 6 MPX ORG/ WIRE PASSENGER SIDE J/B PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PRE RADIO 2 FUSE RED WIRE RED/BLK WIRE RED/WHT WIRE RFC TAM VIO WIRE VZ (GND) GND (VZ) WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE

A/C MPX- CONTROL ASSEMBLY (BEHIND MPX+ CENTER OF DASH) AIR BAG SENSOR ASSEMBLY (AT CENTER OF DASH, BELOW RADIO) BACK-UP LIGHT SWITCH BKUP BL (UNDER DRIVER'S SEAT) BLK WIRE BLK/RED WIRE BLU/ORG WIRE BLU/YEL WIRE BP (AT LEFT QUARTERPANEL) COMBINATION METER MPX+ COMBINATION SWITCH (ON STEERING COLUMN, BEHIND STEERING WHEEL) DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) DRIVER SIDE J/B ECU (BEHIND LEFT KICK PANEL) ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE ROOM 2 R/B (ON LEFT SIDE OF ENGINE COMPT, FORWARD OF STRUT TOWER) FRONT CONTROLLER GATEWAY ECU (BEHIND RIGHT SIDE OF DASH) GRN WIRE JC-17 JUNCTION CONNECTOR 4, 5 (IN ECU BOX) LEFT BACK-UP LIGHT RIGHT BACK-UP LIGHT LUGGAGE ROOM J/B (AT LEFT REAR CORNER OF LUGGAGE COMPARTMENT) LUGGAGE ROOM J/B ECU MPX P-GND PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PASSENGER SIDE J/B ECU MPX- RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RELAY ENERGIZED DRIVE D-IG FUSE SIDE J/B (BEHIND LEFT KICK PANEL) SKID CONTROL ECU (BEHIND LEFT END OF DASH) TILT, TELESCOPIC ECU (BEHIND LEFT END OF DASH) TIRE PRESSURE MONITOR RECEIVER (BEHIND CENTER OF DASH, BELOW RADIO) VIO WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE

10 24 25 RFC HP PRE 24 25 THW ETHW BLK WIRE BLU WIRE BLU/WHT WIRE DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) ED (REAR OF LEFT FENDER) ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE COOLANT TEMPERATURE SENSOR (ON TOP RIGHT SIDE OF ENGINE) ENGINE ROOM 1 R/B (ON RIGHT SIDE OF ENGINE COMPT, BEHIND STRUT TOWER) ENGINE ROOM 2 R/B FAN FUSE FAN FUSE 2 FAN RELAY (ON LEFT SIDE OF ENGINE COMPT, FORWARD OF STRUT TOWER) GND(S) GND(M) HEATER FUSE HOT AT ALL TIMES HOT IN ON OR START IF (AT LEFT KICK PANEL) II (ON LEFT SIDE DASH BRACE) ED (REAR OF LEFT FENDER) JUNCTION CONNECTOR 14 (IN ENGINE ROOM 2 R/B) JUNCTION CONNECTOR 3 (IN ENGINE ROOM 2 R/B) JUNCTION CONNECTOR 8 (BEHIND LEFT END OF DASH) RED WIRE VIO WIRE WHT WIRE WHT/BLK WIRE WHT/GRN WIRE YEL WIRE

13 33 29 30 15 MPX 5 9 10 8 +5 RSSI DATA A/C CONTROL ASSEMBLY (BEHIND CENTER OF DASH) AIR BAG BLK WIRE BLU WIRE BLU/BLK WIRE BLU/ORG WIRE BQ (AT RIGHT QUARTERPANEL) BRN WIRE BRN/WHT WIRE CENTER J/B (BEHIND RIGHT CENTER OF DASH) DBIL DOME FUSE DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) DRIVER'S SIDE J/B ECU ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE ROOM 2 R/B (ON LEFT SIDE OF ENGINE COMPARTMENT, FORWARD OF STRUT TOWER) FRONT CONTROLLER FUSE GATEWAY ECU (BEHIND RIGHT SIDE OF DASH) HOT AT ALL TIMES I/P JUNCTION BLOCK (BEHIND UPPER CENTER OF DASH) IG (LEFT SIDE OF STEERING COLUMN) IGNITION KEY CYLINDER LIGHT IH (UNDER STEERING COLUMN) ILE FSPT J/C 13 (BEHIND RIGHT SIDE OF DASH) J/C 9, 10 (BEHIND TOP LEFT END OF DASH) JC-18 LEFT FOOT LIGHT LEFT VANITY LIGHT MAP DOOR MAP MPX MPX-B ORG/ WIRE PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PASSENGER SIDE J/B ECU PBIL PERSONAL LIGHT PNK/BLU WIRE RDA RSSI RCO RED WIRE RED/BLU WIRE RED/WHT WIRE RIGHT BUCKLE SWITCH (IN RIGHT FRONT SEAT BELT BUCKLE) RIGHT FOOT LIGHT RIGHT SCUFF PLATE LIGHT RIGHT VANITY LIGHT THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) TIRE PRESSURE MONITOR RECEIVER (BEHIND CENTER OF DASH, BELOW RADIO) TRANSPONDER KEY COMPUTER (LEFT SIDE OF DASH, BEHIND GAUGE ASSEMBLY) VIO WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WIRELESS DOOR LOCK CONTROL RECEIVER (ON CENTER OF ROOF HEADER) YEL WIRE

+B +BM 10 2 NSSD 19 20 11 13 18 NEO TRC+ ENG+ TRC- ENG- PNK WIRE 2 4 5 6 7 8 13 17 26 EC BATT 3 4 9 13 14 18 19 20 21 22 26 27 29 30 31 32 33 34 35 TC STP NEO 4 TRC+ ENG+ PNK WIRE ACCEL PEDAL POSITION SENSOR (BEHIND LEFT CENTER OF DASH) BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE CENTER J/B (BEHIND RIGHT CENTER OF DASH) COMBINATION METER COMBINATION SWITCH CCS COMPUTER DATA LINES SYSTEM CRUISE CRUISE CONTROL SWITCH CRUISE IND DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) D-IG FUSE DRIVER SIDE J/B ECU (BEHIND LEFT KICK PANEL) STPI EB (RIGHT SIDE OF CYLINDER HEAD) EC (LEFT SIDE OF CYLINDER HEAD) ED (REAR OF LEFT FENDER) ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE ROOM 2 R/B (ON LEFT EFI RELAY ETA VC 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 IH (UNDER STEERING COLUMN) JUNCTION CONN- ECTOR 2 (IN ENGINE ROOM 2 R/B) JUNCTION CONNECTOR 2 (IN ENGINE ROOM 2 R/B) JUNCTION CONNECTOR 3 (IN ENGINE ROOM 2 R/B) JUNCTION CONNECTOR 4 (IN ECU BOX) JUNCTION CONNECTOR 7 (IN ECU BOX) JUNCTION CONNECTOR 9 (BEHIND TOP LEFT END OF DASH) JUNCTION CONNECTORS 4, 5 (IN ECU BOX) LT GRN WIRE LT GRN/BLK WIRE M- M+ MREL IGSW SIL NCA WIRE PARK/ NEUTRAL POSITION SWITCH (ON TRANSMISSION) PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PNK/BLK WIRE RED WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RES/ ECC SET/ COAST SG WFSE SIDE OF ENGINE COMPT, FORWARD OF STRUT TOWER) SIL SKID CONTROL ECU (BEHIND LEFT END OF DASH) SPEEDOMETER STOP FUSE STOPLIGHT SWITCH (ON TOP OF BRAKE PEDAL BRACKET) THROTTLE CONTROL MOTOR, SENSOR (ON THROTTLE BODY) VEHICLE SPEED SENSOR (ELECTONICALLY CONTROLLED TRANSMISSION) (ON TRANSMISSION) VIO WIRE VPA EPA VCPA WFSE EPTK VPTK TRC- ENG- CCS WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

12 4 TS D/G 16 22 3 TACH WFSE TC AIR BAG SENSOR ASSEMBLY (AT CENTER OF DASH, BELOW RADIO) BLK GRN/ LT WIRE BLK WIRE BLK/WHT WIRE BLK/YEL WIRE BRN WIRE CENTER J/B (BEHIND RIGHT CENTER OF DASH) CG SG COMBINATION METER DATA LINK CONNECTOR (DLC) 3 (BEHIND LEFT SIDE OF DASH) DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) EC (LEFT SIDE OF CYLINDER HEAD) ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) GATEWAY ECU (BEHIND RIGHT SIDE OF DASH) HOT AT ALL TIMES J/C 13 (BEHIND RIGHT SIDE OF DASH) J/C 4, 5 (IN ECU BOX) J/C 7 (IN ECU BOX) J/C 9, 10 (BEHIND TOP LEFT END OF DASH) LT GRN/BLK WIRE MULTI-DISPLAY OBD FUSE PNK/BLK WIRE SIL SKID CONTROL ECU (BEHIND LEFT END OF DASH) TAC TC TS WFSE BAT WFSE WHT WIRE WHT/BLK WIRE

1 2 PNK WIRE 16 2 TACH A/C FUSE ABS IND. BEAM LEVEL IND BLK WIRE BLK/YEL WIRE BLU WIRE BLU/ORG WIRE BLU/RED WIRE BRAKE FLUID LEVEL WARNING SWITCH (IN BRAKE FLUID RESERVOIR) BRAKE IND BRN WIRE BUZZER CENTER J/B (BEHIND RIGHT CENTER OF DASH) CHARGE IND CLOCK (A/C CONTROL ASSEMBLY) +B COMBINATION METER COMPUTER DATA LINES SYSTEM CRUISE IND DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) D-IG FUSE ECT PWR IND ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPARTMENT, ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE OIL LEVEL SENSOR (ON RIGHT FRONT OF ENGINE) ETC SNOW IND FRONT FOG IND FUEL FUEL IND FUEL SENDER (MAIN) FUEL SENDER (SUB) (IN FUEL TANK) FUSE 75 GRN/BLK WIRE GRN/YEL WIRE GRY WIRE HEAD IND (USA) HIGH BEAM IND HOT AT ALL TIMES HOT IN ON OR ACC HOT IN ON OR START II (ON LEFT SIDE DASH BRACE) IN ECU BOX) INSTRUMENT PANEL J/B (BEHIND UPPER CENTER OF DASH) J/C 13 (BEHIND RIGHT SIDE OF DASH) JUNCTION CONNECTOR 7 (IN ECU BOX) LBL LEFT TURN IND MALFUNCTION IND LAMP MOL MOPS MULTI-DISPLAY NAVIGATION ECU (AT RIGHT REAR CORNER OF LUGGAGE COMPT) W/ NAVIGATION SYSTEM NCA WIRE ODOMETER/ TRIPMETER OIL LEVEL IND OIL PRESSURE IND OIL PRESSURE SWITCH (ON LEFT FRONT SIDE OF ENGINE) OPEN DOOR IND PARKING BRAKE SWITCH (BEHIND LEFT SIDE OF DASH) PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PNK WIRE RADIO 2 FUSE REAR LIGHTS IND RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RIGHT TURN IND SEAT BELT IND SKID CONTROL ECU (BEHIND LEFT END OF DASH) SLIP IND SPEEDOMETER SRS IND STEREO COMPONENT AMPLIFIER (AT RIGHT REAR CORNER OF LUGGAGE COMPT) TAC TACHOMETER TAIL IND (CANADA) TIRE PRESSURE IND TRIP SWITCH IH (UNDER STEERING COLUMN) VIO WIRE VSC IND VSC OFF IND WARNING SYSTEM WASHER IND WATER TEMPERATURE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

1 20 22 21 12 15 6 17 18 TC 2 10 11 1 9 8 IG A/C CONTROL ASSEMBLY (BEHIND CENTER OF DASH) A/T SHIFT LEVER ILLUMINATION AUDIO DOOR CONTROL SWITCH BLK WIRE BLU WIRE BLU/BLK WIRE BLU/ORG WIRE BLU/YEL WIRE BRN WIRE CENTER J/B (BEHIND RIGHT CENTER OF DASH) CIGARETTE LIGHTER VSC OFF SWITCH COMBINATION SWITCH DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) DRIVER SIDE J/B ECU ELECTRONICALLY CONTROLLED TRANSMISSION PATTERN SELECT SWITCH ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE ROOM 2 R/B (ON LEFT SIDE OF ENGINE COMPARTMENT, FORWARD OF STRUT) FRONT CONTROLLER FUSE GATEWAY ECU (BEHIND RIGHT SIDE OF DASH) GRN WIRE HOT AT ALL TIMES HOT IN ON OR START I/P JUNCTION BLOCK IH (UNDER STEERING COLUMN) IG (LEFT SIDE OF STEERING COLUMN) II (ON LEFT SIDE DASH BRACE) J/C 13 (BEHIND RIGHT SIDE OF DASH) J/C 9, 10 (BEHIND TOP LEFT END OF DASH) MPX MPX-IG FUSE MULTI- DISPLAY (W/ NAVI- GATION) ORG/ WIRE PANEL FUSE PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PNK WIRE PNK/BLU WIRE RADIO, PLAYER RED WIRE RED/BLU WIRE RED/YEL WIRE REMOTE CONTROL MIRROR SWITCH RHEOSTAT SEAT HEATER SWITCH (IF EQUIPPED) TILT, TELESCOPIC ECU (BEHIND LEFT END OF DASH) TIRE PRESSURE MONITOR RECEIVER (BEHIND CENTER OF DASH, BELOW RADIO) TR+ RV TRANSPONDER KEY COMPUTER (LEFT SIDE OF DASH, BEHIND GAUGE ASSEMBLY) VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE YEL WIRE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 CPUB 24 23 21 20 13 12 IMI IMO 5 4 3 2 1 GND TXCT RXCK CODE +B 7 15 16 HRLY COMPUTER DATA LINES SYSTEM 7 8 1 2 4 5 DL LL PL RL AIRBAG BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLU WIRE BLU/ WHT WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/WHT WIRE CENTER J/B (BEHIND RIGHT CENTER OF DASH) CNCL CODE RXCK TXCT AGND GND COMPUTER DATA LINES SYSTEM CRA RELAY DATA DRIVER SIDE J/B (BEHIND LEFT KICK PANEL) DRIVER SIDE J/B ECU (BEHIND LEFT KICK PANEL) ED (REAR OF LEFT FENDER) EFIO EFII ENGINE CONTROL MODULE (AT LEFT SIDE OF ENGINE COMPT, IN ECU BOX) ENGINE ROOM 2 R/B (ON LEFT SIDE OF ENGINE COMPT, FORWARD OF STRUT TOWER) FRONT CONTROLLER GRN BLK/ WIRE GRN WIRE GRN/ YEL WIRE GRN/BLK WIRE GRN/RED WIRE GRN/YEL WIRE GRY WIRE HDCY HEAD LP RELAY HEADLIGHTS SYSTEM HORN FUSE HORN RELAY HORN RLY HORNS SYSTEM HOT AT ALL TIMES HOT IN ON OR START IG (25-28 NOT USED) 29 30 31 32 33 RDA RSSI IGN FUSE IH (UNDER STEERING COLUMN) IND BZR JUNCTION CONNECTOR 2 (IN ENGINE JUNCTION CONNECTOR 3 (IN ENGINE ROOM 2 R/B) LT GRN/BLK WIRE MAIN FUSE MAIN LUGGAGE COMPARTMENT DOOR OPENER SWITCH MPX ORG/ WIRE PARK/NEUTRAL POSITION SWITCH (ON TRANSMISSION) PASSENGER SIDE J/B (BEHIND RIGHT KICK PANEL) PASSENGER SIDE J/B ECU (RIGHT SIDE KICK PANEL) PNK WIRE PNK/BLU WIRE RCO (16-19 NOT USED) 20 21 22 23 24 RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE ROOM 2 R/B) RSSI SECURITY INDICATOR LIGHT TAIL-RLY THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) THEFT DETERRENT HORN (AT RIGHT FRONT OF ENGINE COMPT) TRANSPONDER KEY AMPLIFIER (BEHIND DASH, RIGHT OF STEERING COLUMN) TRANSPONDER KEY COIL UNLOCK WARNING SWITCH (BEHIND LEFT SIDE OF DASH) VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/YEL WIRE WIRELESS DOOR LOCK BUZZER YEL WIRE