Lexus LS III facelift (2003-2006) engine control module (on left front of engine compt, in protective case) Wiring diagrams

3 2 1 BAT ESS IG 5 4 3 2 1 IG ABS IG FUSE ABS IND. BLK WIRE BLK/RED WIRE BLU WIRE BLU/YEL WIRE BRAKE IND BRN WIRE BUZZER CANH CANL GND COMBINATION METER COMPUTER DATA LINES SYSTEM DOME FUSE (AT RIGHT KICK PANEL) DRIVER SIDE J/B DRIVER SIDE J/B ECU (AT LEFT KICK PANEL) STPI ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE ROOM 1 R/B FR-IG (ON LEFT FRONT OF FUSE ENGINE COMPT, BEHIND HEADLIGHT) FUSE GAUGE FUSE GRN WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLK WIRE HOT AT ALL TIMES IH (AT RIGHT SIDE OF SHIFT LEVER) II (AT RIGHT SIDE OF SHIFT LEVER) JUNCTION CONNECTOR 1, 2 (LEFT FRONT OF ENGINE COMPT) JUNCTION CONNECTOR 12, 13 JUNCTION CONNECTOR 16, 17 (BEHIND UPPER CENTER OF DASH) MULTI-DISPLAY ORG/ WIRE PASSENGER SIDE J/B RED WIRE SLIP IND SPEEDOMETER STEERING SENSOR (INSIDE TOP OF STEERING COLUMN) STOP FUSE STOPLIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) STPA TRAC OFF IND VSC WARNING BUZZER (BEHIND LOWER LEFT SIDE OF DASH) WHT WIRE WHT/BLK WIRE WHT/GRN WIRE YAW RATE SENSOR (BELOW REAR OF CENTER CONSOLE) YEL WIRE

2 1 3 4 5 GND VZ PT MOPEN MSHUT 2 1 4 5 3 GND VZ MOPEN MSHUT PT 2 3 1 SHUT 5 4 1 2 3 FRS REC VZ GND PT 6 5 2 PNK WIRE A/C AMBIENT TEMPERATURE SENSOR (BEHIND LEFT SIDE OF BUMPER FASCIA) A/C CONTROL ASSEMBLY A/C EVAPORATOR TEMPERATURE SENSOR A/C IG FUSE A/C ROOM TEMPERATURE SENSOR (BEHIND LEFT CENTER OF DASH) AIR INLET CONTROL SERVO MOTOR (RIGHT SIDE OF DASH) AIR MIX CONTROL SERVO MOTOR (DRIVER SIDE) (CENTER OF DASH) AIR VENT MODE CONTROL SERVO MOTOR (DRIVER SIDE) (CENTER OF DASH) AMPB AOPB BLK WIRE BLK/BLU WIRE BLK/ORG WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/BLK WIRE BRN/WHT WIRE BRN/YEL WIRE C-GND COMPUTER DATA LINES SYSTEM COOL AIR BYPASS SERVO MOTOR (DRIVER SIDE) (LEFT SIDE OF DASH) COOL AIR BYPASS SERVO MOTOR (FRONT PASSENGER SIDE) (RIGHT SIDE OF DASH) COOLING FAN ECU (ON FRONT CENTER OF ENGINE COMPT, ON RADIATOR SUPPORT) D-SIG DUCT SENSOR (DRIVER'S SIDE) (BEHIND UPPER LEFT SIDE OF DASH) DUCT SENSOR (FRONT PASSENGER'S SIDE) (BEHIND UPPER RIGHT SIDE OF DASH) ED (AT TOP LEFT OF DASH) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE COOLANT TEMPERATURE SENSOR (ON FRONT CENTER OF ENGINE) ENGINE ROOM R/B 1 FR IG FUSE (ON LEFT FRONT OF ENGINE COMPT, BEHIND HEADLIGHT) EXHAUST GAS SENSOR (ON RIGHT SIDE OF ENGINE, ON EXHAUST SYSTEM) FAN FUSE FAN RELAY FUSIBLE LINK BLOCK (ON RIGHT REAR OF ENGINE COMPT) GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN ON OR START JUNCTION CONNECTOR 3 (LEFT FRONT OF ENGINE COMPT) JUNCTION CONNECTOR 7 (BELOW ENGINE ROOM J/B 1, ENGINE ROOM R/B 1) LT GRN WIRE LT GRN/BLK WIRE LT GRN/RED WIRE LT GRN/WHT WIRE MAGNETIC FIELD SENSOR (W/ COMPASS) (BEHIND CENTER OF DASH) NCA WIRE NOX ORG/ WIRE PNK WIRE PNK/BLK WIRE PNK/BLU WIRE PNK/GRN WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RFC SG-7 AIF AIR SHORT CONNECTOR TAM TFACEPA TFACEDR TR NOX TPBDR TPBPA AODB VMID WATER VALVE SERVO MOTOR (CENTER OF DASH) WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WVIG WVO ABODR ABSDR WVS ABOPA ABSPA AMDB YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE

A/C CONTROL ASSEMBLY A/C FUSE SIDE J/B (AT LEFT KICK PANEL) BLK WIRE BLK/YEL WIRE BLU WIRE BRN WIRE COOLING FAN ECU (ON FRONT CENTER OF ENGINE COMPT, ON RADIATOR SUPPORT) ED (AT TOP LEFT OF DASH) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE COOLANT TEMPERATURE SENSOR (ON FRONT CENTER OF ENGINE) ENGINE ROOM 1 R/B (ON LEFT FRONT OF ENGINE COMPT, BEHIND HEADLIGHT) FAN FUSE FAN RELAY FR IG FUSE FUSIBLE LINK BLOCK (ON RIGHT REAR OF ENGINE COMPT) GRN WIRE GRN/RED WIRE GRY WIRE HOT AT ALL TIMES HOT IN ON OR ACC HOT IN ON OR START IG +B GND IK (AT RIGHT SIDE OF DASH) JUNCTION CONNECTOR 1 (LEFT FRONT OF ENGINE COMPT) JUNCTION CONNECTOR 14, 15 (BEHIND UPPER CENTER OF DASH) JUNCTION CONNECTOR 3 (LEFT FRONT OF ENGINE COMPT) JUNCTION CONNECTOR 7 (BELOW ENGINE ROOM 1 J/B, ENGINE ROOM 1 R/B) LT GRN WIRE LT GRN/RED WIRE P-ACC FUSE P-IG FUSE PASSENGER SIDE J/B (AT RIGHT KICK PANEL) RED WIRE RED/BLU WIRE RFC SHORT CONNECTOR WHT WIRE WHT/BLK WIRE WHT/BLU WIRE YEL WIRE

+BM 1 2 M+ M- 2 7 SR BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/YEL WIRE BRN WIRE COMBINATION METER COMPUTER DATA LINES SYSTEM CRUISE IND DOME FUSE DRIVER SIDE J/B (AT LEFT KICK PANEL) DRIVER SIDE J/B GAUGE FUSE (AT LEFT KICK PANEL) EE (ON RIGHT CYLINDER HEAD) EF (ON LEFT CYLINDER HEAD) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) EOIL OIL SLT- SLT+ FUSE GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRN/YEL WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN ON OR START IH (AT RIGHT SIDE OF SHIFT LEVER) II (AT RIGHT SIDE OF SHIFT LEVER) J/C 10 (BEHIND UPPER CENTER OF DASH) J/C 12,13 (BEHIND UPPER CENTER OF DASH) J/C 13 (BEHIND UPPER CENTER OF DASH) J/C 16, 17 (BEHIND UPPER CENTER OF DASH) J/C 3, 4 (LEFT FRONT OF ENGINE COMPT) MULTI-DISPLAY PASSENGER SIDE J/B PASSENGER SIDE J/B (AT RIGHT KICK PANEL) PNK/BLK WIRE RED WIRE RED/WHT WIRE RED/YEL WIRE SHIELD SHIELD 4 5 6 28 29 22 23 SLU- SLU+ SPEEDOMETER THROTTLE POSITION SENSOR, MOTOR (ON THROTTLE BODY) TRANSMISSIONS SYSTEM VEHICLE SPEED SENSOR (ON TRANSMISSION) VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/GRN WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

13 12 STPI STPO 2 4 5 6 8 13 17 24 25 22 EC BATT ACCEL POSITION SENSOR (BEHIND LEFT CENTER OF DASH) BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/YEL WIRE CANCEL CRUISE CONTROL SWITCH COMBINATION SWITCH COMPUTER DATA LINES SYSTEM CRUISE DRIVER SIDE J/B (AT LEFT KICK PANEL) STOP FUSE DRIVER SIDE J/B ECU (AT LEFT KICK PANEL) EC (AT LEFT RADIATOR SIDE SUPPORT) EFI 1 FUSE ETCS FUSE ENGINE COMPT) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) FR IG FUSE GRN/BLK WIRE GRN/ORG WIRE GRN/YEL WIRE HOT AT ALL TIMES HOT IN ON OR START IGN FUSE J/C J/C 1, 2 (LEFT FRONT OF ENGINE COMPT) J/C 3 (LEFT FRONT OF J/C 35 (LEFT SIDE OF DASH) MREL IGSW CANL CANH SPD OBD FUSE ORG/ WIRE PNK/BLK WIRE RED WIRE RED/BLK WIRE RED/YEL WIRE RES+ SET/ COAST SFTD SFTU CCS SHORT CONNECTOR (LEFT FRONT OF ENGINE COMPT) STOPLIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) STP TC TRANSMISSIONS SYSTEM VIO/WHT WIRE VIO/YEL WIRE VPA EPA VCPA WHT WIRE WHT/BLK WIRE WHT/BLU WIRE YEL/BLK WIRE

2 7 SR BLK WIRE BLK/WHT WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/YEL WIRE BRN WIRE COMBINATION METER COMPUTER DATA LINES SYSTEM CRUISE IND DOME FUSE DRIVER SIDE J/B (AT LEFT KICK PANEL) EE (ON RIGHT CYLINDER HEAD) EF (ON LEFT CYLINDER HEAD) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) EOIL OIL SLT- SLT+ FUSE GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRN/YEL WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN ON OR START IH (AT RIGHT SIDE OF SHIFT LEVER) II (AT RIGHT SIDE OF SHIFT LEVER) J/C 10 (BEHIND UPPER CENTER OF DASH) J/C 12 (BEHIND UPPER CENTER OF DASH) J/C 13 (BEHIND UPPER CENTER OF DASH) J/C 16, 17 (BEHIND UPPER CENTER OF DASH) PASSENGER SIDE J/B (AT RIGHT KICK PANEL) PNK/BLK WIRE RED WIRE RED/WHT WIRE SHIELD SHIELD 1 2 4 5 6 28 29 22 23 M- M+ SLU- SLU+ SPEEDOMETER THROTTLE POSITION SENSOR, MOTOR (ON THROTTLE BODY) TRANSMISSIONS SYSTEM VEHICLE SPEED SENSOR (ON TRANSMISSION) VIO/WHT WIRE WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE YEL/GRN WIRE

13 24 42 D/G TS WFSE 14 13 TD SIL 16 3 TACH TC 7 8 9 10 11 12 13 14 15 16 SIL AIR SUSPENSION ECU (BEHIND RIGHT SIDE OF DASH) BLK WIRE BLK/YEL WIRE BLU/BLK WIRE BRN WIRE CG SG CANH COMBINATION METER DRIVER SIDE J/B (AT LEFT KICK PANEL) EF (ON LEFT 1 2 3 4 5 6 CYLINDER HEAD) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) GATEWAY ECU (BEHIND LEFT END OF DASH) GRN WIRE HOT AT ALL TIMES J/C 13 (BEHIND UPPER CENTER OF DASH) J/C 16, 17 (BEHIND UPPER CENTER OF DASH) J/C 3, 4 (LEFT FRONT OF ENGINE COMPT) J/C 42 (CENTER OF DASH) LT GRN/BLK WIRE MULTI-DISPLAY OBD FUSE OPA TS TC CANL WFSE BAT PNK/BLK WIRE SIL SKID CONTROL ECU W/ ACTUATOR (BEHIND LEFT SIDE OF DASH) TAC WHT WIRE WHT/BLK WIRE WHT/GRN WIRE

11 25 CANH CANL 2 3 CANL CANH 24 25 CANL CANH 3 13 10 2 PNK MPX MPX- BUBS MPX+ WIRE 8 7 CANL CANH 9 10 CANL CANH 9 8 CANL CANH AFS ECU (RIGHT SIDE OF DASH) AIR SUSPENSION ECU (IF EQUIPPED) (BEHIND RIGHT SIDE OF DASH) BLK WIRE BLK/RED WIRE BLU WIRE BO (AT RIGHT REAR QUARTER- PANEL) BRN WIRE CLEARANCE SONAR ECU (W/ NAVIGATION) (ON LEFT SIDE OF LUGGAGE COMPARTMENT) COMBINATION SWITCH DATA LINK CONNECTOR 3 (BELOW LEFT SIDE OF DASH) 14 6 7 CANL CANH SIL DRIVER DOOR ECU (INSIDE FRONT OF LEFT FRONT DOOR) DRIVER SEAT ECU (BELOW LEFT SIDE OF DRIVER'S SEAT) DRIVER SIDE J/B (AT LEFT KICK PANEL) DRIVER SIDE J/B ECU (AT LEFT KICK PANEL) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) GRN WIRE IH (AT RIGHT SIDE OF SHIFT LEVER) II (AT RIGHT SIDE OF SHIFT LEVER) J/C 29 (REARWARD OF RIGHT REAR FENDERWELL) J/C 31 (W/ REAR POWER SEAT) (BEHIND LEFT REAR SEAT BACK) J/C 36, 37, 38, 39 40, 41, 42, 43 (CENTER OF DASH) J/C 44, 45, 46, 47, 48 (RIGHT SIDE OF DASH) J/C 49, 50, 51 (W/ NAVIGATION SYSTEM) (RIGHT REAR OF VEHICLE) LEFT REAR DOOR ECU (INSIDE LEFT REAR DOOR) LEFT REAR SEAT ECU (BEHIND LEFT SIDE OF REAR SEAT BACK) LT GRN WIRE LUGGAGE ROOM J/B ECU (ON LEFT SIDE OF LUGGAGE COMPARTMENT) MPX PASSENGER SIDE J/B (AT RIGHT KICK PANEL) PNK M+ WIRE PNK WIRE PNK/BLU WIRE POWER SEAT CONTROL SWITCH (REAR SEAT) (LEFT SIDE OF REAR SEAT) POWER TILT, POWER TELESCOPIC ECU (BEHIND LEFT SIDE OF DASH) RED WIRE RED/BLU WIRE STEERING LOCK ECU (W/ SMART KEY SYSTEM) (LEFT SIDE OF DASH) STEERING SENSOR (INSIDE TOP OF STEERING COLUMN) TELEVISION CAMERA ECU (RIGHT REAR OF LUGGAGE COMPT) THEFT DETERRENT ECU (BEHIND UPPER RIGHT CENTER OF DASH) TRANSPONDER KEY COMPUTER (W/O SMART KEY SYSTEM) (BEHIND UPPER CENTER OF DASH) VIO WIRE VIO/GRN WIRE W/O NAVIGATION SYSTEM WHT WIRE WHT/BLK WIRE WHT/GRN WIRE YAW RATE SENSOR (BELOW REAR OF CENTER CONSOLE) YEL WIRE

BLK WIRE BLK/YEL WIRE BLU WIRE COMPUTER DATA LINES SYSTEM CPUB EFII ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) FUSE GATEWAY ECU (BEHIND LEFT END OF DASH) GRN/BLK WIRE GRN/YEL WIRE GRY/GRN WIRE GRY/RED WIRE HOT AT ALL TIMES IGNITION SWITCH IMI IMO JUNCTION CONNECTOR 10, 11 (BEHIND UPPER CENTER OF DASH) LOCK OFF LP SEID LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PASSENGER SIDE J/B (AT RIGHT KICK PANEL) PNK/BLK WIRE PNK/BLU WIRE RED WIRE RED/BLU WIRE RUN WIRE RXCK GND +B PUSH KWS EFIO SECURITY INDICATOR LIGHT (RHEOSTAT) SHIFT LOCK CONTROL ECU (BELOW SHIFT LEVER, IN CENTER CONSOLE) STEERING LOCK ECU (LEFT SIDE OF DASH) STR LOCK FUSE THEFT MPX DETERRENT ECU (BEHIND UPPER RIGHT CENTER OF DASH) IND TRANSPONDER KEY COIL TRANSPONDER RXCK TXCT CODE GND KEY AMPLIFIER (BEHIND UPPER CENTER OF DASH) TXCT CODE AGND UNLOCK WARNING SW VIO WIRE VIO/RED WIRE VIO/YEL WIRE WHT WIRE WHT/BLK WIRE YEL/BLK WIRE