Lexus IS I (1999-2005) engine control module (on left front of engine compt, in protective case) 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 WA 2 3 1 SE A/C CONTROL ASSEMBLY A/T A/T M/T ABS IND. BLK WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/YEL WIRE BRAKE IND BRAKE PEDAL LOAD SENSING SWITCH BRL ENG+ TS TRC+ BRN WIRE COMBINATION METER COMPUTER DATA LINES SYSTEM D/G DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ENG ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) FRO FSW- FSW+ GRN WIRE GRN/RED WIRE GRN/WHT WIRE GRY WIRE HEADLIGHTS SYSTEM HOT AT ALL TIMES STOP FUSE HOT IN ON OR START ECU-IG FUSE HOT IN ON OR START GAUGE FUSE IH (AT RIGHT SIDE OF FIREWALL) IND JUNCTION CONNECTOR JUNCTION CONNECTOR 6 (BEHIND LEFT SIDE OF DASH, FORWARD OF INSTRUMENT CLUSTER) LEFT REAR ABS SPEED SENSOR LT GRN WIRE LT GRN/RED WIRE M/T MPX- SNOW NEO PARKING BRAKE SWITCH (AT BASE OF PARKING BRAKE LEVER) PNK ENG- WIRE PNK WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RIGHT REAR ABS SPEED SENSOR RR- RR+ SKID CONTROL ECU (LEFT SIDE OF DASH) SLIP IND SNOW SPEED- DOMETER STOPLIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) STP WT TRAC OFF TRAC OFF IND TRAC OFF SWITCH, SNOW SWITCH TRC+ TRC- PKB RL+ RL- VEHICLE SPEED SENSOR (M/T) (ON LEFT REAR OF TRANSMISSION) WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL/GRN WIRE YEL/RED WIRE

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 27 28 VYS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 WA ABS IND. BAT TRIG BJ (AT LEFT FRONT FLOOR PANEL) BLK WIRE BLK/RED WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/YEL WIRE BRAKE IND BRAKE PEDAL LOAD SENSING SWITCH BRL ENG+ TS TRC+ BRN WIRE BRN/WHT WIRE COMBINATION METER COMPUTER DATA LINES SYSTEM D/G DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ECU-IG FUSE ENG ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) FRO VSCW RR- RR+ GAUGE FUSE GRN WIRE GRN/RED WIRE GRN/WHT WIRE GRY WIRE GSS GYAW HEADLIGHTS SYSTEM HOT AT ALL TIMES HOT IN ON OR START IE (AT LEFT FRONT FLOOR PANEL CENTER) IH (AT RIGHT SIDE OF FIREWALL) JUNCTION CONNECTOR 6 (BEHIND LEFT SIDE OF DASH, FORWARD OF INSTRUMENT CLUSTER) JUNCTION CONNECTOR 7 (BEHIND UPPER RIGHT SIDE OF DASH) LEFT REAR ABS SPEED SENSOR LT GRN WIRE LT GRN/BLK WIRE LT GRN/RED WIRE NCA WIRE NEO PARKING BRAKE SWITCH (AT BASE OF PARKING BRAKE LEVER) PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PNK ENG- WIRE PNK WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RIGHT REAR ABS SPEED SENSOR SKID CONTROL ECU (LEFT SIDE OF DASH) SLIP IND SPEED- DOMETER STEERING SENSOR (AT BASE OF STEERING COLUMN) STOP FUSE STOPLIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) STP WT BZ IND TRAC OFF IND TRAC OFF SWITCH TRC+ TRC- PKB RL+ RL- +BO VSC IND VSC WARNING BUZZER VYS WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YAW RATE SENSOR YEL WIRE YEL/BLK WIRE YEL/GRN WIRE YEL/RED WIRE YSS FSW- FSW+ TRIG CSW

1 2 3 4 (5-6 NOT USED) 7 8 (9-11 NOT USED) 12 1 4 11 13 17 30 31 EOM BATT KSW MREL IGSW IMLD CODE A/C CONTROL ASSEMBLY BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/YEL WIRE BRN WIRE CODE COMBINATION METER DATA LINK CONNECTOR 3 (BEHIND LOWER LEFT SIDE OF DASH) DOME FUSE MPX-B FUSE DOOR DL FUSE DSWH LUG NAVI EC (AT LEFT FENDER APRON) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE HOOD COURTESY SWITCH (ON FRONT CENTER OF ENGINE COMPT, NEAR HOOD LATCH) FUSE GRN WIRE GRN/BLK WIRE GRN/WHT WIRE GRN/YEL WIRE GROUND HOT AT ALL TIMES HOT IN ON OR START IGN FUSE IH (AT RIGHT SIDE OF FIREWALL) IND IND SECURITY J/C 3 (NEAR ENGINE CONTROL MODULE) J/C 5 (ABOVE DRIVER SIDE J/B) J/C 6 (BEHIND LEFT SIDE OF DASH, FORWARD OF INSTRUMENT CLUSTER) J/C 7 (BEHIND UPPER RIGHT SIDE OF DASH) MPX MULTI- DISPLAY DR ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PNK/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RXCK SH- SH HORN SIL CG THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) THEFT DETERRENT HORN (ON LEFT SIDE OF ENGINE COMPT, ON STRUT TOWER) TRANSPONDER KEY AMPLIFIER (ON STEERING COLUMN, NEAR IGNITION SWITCH) TXCT TXCT RXCK UNLOCK WARNING SWITCH VIO WIRE WHT WIRE WHT/BLK WIRE WHT/RED WIRE

A/C CONTROL ASSEMBLY ALT FUSE ALT-S FUSE BATTERY BATTERY GROUND BLK/BLU WIRE BLU WIRE BLU/RED WIRE BRN/WHT WIRE CHARGE INDICATOR COMBINATION METER COMPUTER DATA LINES SYSTEM DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPT) GAUGE FUSE GENERATOR IG HOT AT ALL TIMES HOT IN ON OR START IE (AT LEFT FRONT FLOOR PANEL CENTER) MPX MPX-B FUSE NCA WIRE ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RED/BLU WIRE RED/YEL WIRE THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) WHT/BLU WIRE

16 20 22 3 TACH 19 3 12 TC LA SIL A/C CONTROL ASSEMBLY BK (AT RIGHT FRONT FLOOR PANEL) BLK WIRE BLK/YEL WIRE BLU WIRE BODY ECU (BEHIND LOWER LEFT END OF DASH, INTEGRAL WITH DRIVER SIDE J/B) BRN WIRE CENTER AIR BAG SENSOR ASSEMBLY (BELOW CENTER OF DASH, ON TRANSMISSION TUNNEL) CG SG A/B SIL COMBINATION METER D/G DATA LINK CONNECTOR 3 (BEHIND LOWER LEFT SIDE OF DASH) DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EB (AT CENTER LEFT SIDE OF INTAKE MANIFOLD) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) HOT AT ALL TIMES OBD FUSE IH (AT RIGHT SIDE OF FIREWALL) J/C 16 (SEDAN) (ABOVE RIGHT REAR FENDERWELL) LT GRN WIRE MPX MPX+ MPX- MULTI-DISPLAY ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) POWER WINDOW MASTER SWITCH RED/WHT WIRE SIL SKID CONTROL ECU TAC TC TS WFSE BAT THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) VIO WIRE WAGON WFSE TC WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL/RED WIRE

18 8 16 7 1 GND +B IG A/C CONDENSER FAN MOTOR A/C CONTROL ASSEMBLY A/C DIODE (BEHIND RIGHT END OF DASH) A/C SINGLE PRESSURE SWITCH ACMG BLK/RED WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE CDS FAN FUSE DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EC (AT LEFT FENDER APRON) ECU-IG FUSE ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPT) ENGINE ROOM R/B 3 (ON LEFT SIDE OF ENGINE COMPT) FAN FAN 1 RELAY FAN 2 RELAY FAN 3 RELAY GRY WIRE HOT AT ALL TIMES HOT IN ON OR ACC HOT IN ON OR START IH (AT RIGHT SIDE OF FIREWALL) INSTRUMENT CLUSTER SYSTEM JUNCTION CONNECTOR 10 (BEHIND UPPER RIGHT SIDE OF DASH) JUNCTION CONNECTOR 19 JUNCTION CONNECTOR 3 (ON LEFT SIDE OF ENGINE COMPT, NEAR ENGINE CONTROL MODULE) MPX MPX-B FUSE ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RADIATOR FAN MOTOR RADIO 2 FUSE RDI FAN FUSE RED WIRE RED/YEL WIRE WATER TEMPERATURE SWITCH (ON RIGHT SIDE OF RADIATOR) WHT WIRE WHT/BLK WIRE WHT/BLU WIRE

+B +BM STT- MREL IGSW 1 2 4 5 6 7 8 13 17 EOM EC BATT 3 4 13 14 20 21 31 32 33 34 35 TC STP D/CLSW 4 A/T BLK/BLU WIRE BLK/ORG WIRE BLK/RED WIRE BLK/YEL WIRE BLU WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE CL CL+ COMPUTER DATA LINES SYSTEM CRUISE CONTROL CLUTCH SWITCH DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EA (AT FRONT OF INTAKE MANIFOLD) EC (AT LEFT FENDER APRON) EFI RELAY ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPT) ENGINE ROOM 2 R/B (ON RIGHT REAR OF ENGINE COMPT) ETCS FUSE EFI FUSE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN ON OR START HOT IN ON OR START GAUGE FUSE ECU- IG FUSE IH (AT RIGHT SIDE OF FIREWALL) J/C 4 (ON LEFT SIDE OF ENGINE COMPT, NEAR ENGINE CONTROL MODULE) JUNCTION CONNECTOR 1, 2 JUNCTION CONNECTOR 1, 2 (NEAR ENGINE CONTROL MODULE) JUNCTION CONNECTOR 6 (BEHIND LEFT SIDE LT GRN/BLK WIRE M- M+ M/T NCA WIRE OF DASH, FORWARD OF INSTRUMENT CLUSTER) ORG/ WIRE PARK/NEUTRAL POSITION SWITCH (ON RIGHT SIDE OF TRANSMISSION) PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) IGN FUSE PASSENGER SIDE J/B (BEININD LOWER RIGHT END OF DASH) PNK/BLU WIRE RED WIRE RED/BLU WIRE RED/WHT WIRE STOP FUSE STOPLIGHT SWITCH (ABOVE BRAKE PEDAL, ON BRACKET) TRANSMISSION CONTROL SWITCH (SHIFT LOCK CONTROL ECU) WHT WIRE WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/RED WIRE

13 14 FE FR 3 1 PKB MPX- 8 18 +B GND A/C CONTROL ASSEMBLY A/T ABS IND. ANTI-LOCK BRAKES SYSTEM ANTI-THEFT SYSTEM HEADLIGHTS SYSTEM BEAM IND BEAM LEVEL IND BLK WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/YEL WIRE BODY ECU BRAKE FLUID LEVEL WARNING SWITCH (ON BRAKE FLUID RESERVOIR) BRAKE IND BRL PKB VSCW BRN WIRE BRN/WHT WIRE BUZZER CHARGE IND COMBINATION METER COMPUTER DATA LINES SYSTEM CRUISE IND DOOR IND DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) DRIVER SIDE SIDE J/B (BEHIND LOWER LEFT END OF DASH) ECT PWR IND ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE CONTROLS SYSTEM ENGINE CONTROLS, NAVIGATION SYSTEM ENGINE OIL LEVEL SENSOR (ON LOWER LEFT FRONT OF ENGINE) ENGINE OIL PRESSURE SWITCH (ON LEFT FRONT OF ENGINE) FUEL FUEL IND FUEL SENDER (SUB) (UNDER RIGHT SIDE OF VEHICLE, FORWARD OF RIGHT FENDERWELL) FUEL SENDER (UNDER LEFT SIDE OF VEHICLE, FORWARD OF LEFT FENDERWELL) GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/YEL WIRE GRY WIRE HEADLIGHTS SYSTEM HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ON OR START HOT W/ TAIL RELAY ENERGIZED ID (AT LEFT SIDE OF FIREWALL) IE (AT LEFT FRONT FLOOR PANEL CENTER) IG+ SI SE 3 2 IH (AT RIGHT SIDE OF FIREWALL) ILLUMINATION JUNCTION CONNECTOR 10 (BEHIND UPPER RIGHT SIDE OF DASH) JUNCTION CONNECTOR 5 (ABOVE DRIVER SIDE J/B) JUNCTION CONNECTOR 6 (FORWARD OF INSTRUMENT CLUSTER) JUNCTION CONNECTOR 7 (BEHIND UPPER RIGHT SIDE OF DASH) LBL LCD SPEEDOMETER LT GRN WIRE LT GRN/BLK WIRE M/T MALFUNCTION INDICATOR LAMP MOL MOMENTARY FUEL CONSUMPTION MOPS MPX MPX-B FUSE OIL LEVEL IND OIL PRESSURE IND ORG/ WIRE OUT SIDE TEMP GAUGE PANEL FUSE 7.5 PARKING BRAKE SWITCH (AT BASE OF PARKING BRAKE LEVER) PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) SRS-B FUSE RADIO 2 FUSE REAR LIGHTS IND RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE SEAT BELT IND SECURITY IND SKID CONTROL ECU SLIP IND SNOW IND SRS IND TACHOMETER TRAC OFF IND TURN LH IND TURN RH IND VEHICLE SPEED SENSOR (COMBINATION METER) (ON LEFT REAR OF TRANSMISSION) VIO/GRN WIRE VOLT VSC IND WATER TEMP 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 2 3 4 5 6 7 8 9 10 NSSD BLK WIRE BLK/RED WIRE BLU WIRE BLU/RED WIRE BRN WIRE DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) GAUGE FUSE ECU-IG FUSE ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) GRN WIRE GRN/RED WIRE GRN/WHT WIRE GRY WIRE GRY/BLK WIRE HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ON OR START IH (AT RIGHT SIDE OF FIREWALL) J/C 1, J/C 2 (ON LEFT SIDE OF ENGINE COMPT, NEAR ENGINE CONTROL MODULE) J/C 10 (BEHIND UPPER RIGHT SIDE OF DASH) J/C 5 (BEHIND LEFT END OF DASH) J/C 7 (BEHIND UPPER RIGHT SIDE OF DASH) KEY INTER LOCK SOLENOID KLS+ LT GRN/BLK WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RADIO 2 FUSE RED WIRE SHIFT LOCK CONTROL ECU (BELOW RIGHT SIDE OF TRANSMISSION SHIFT LEVER) SHIFT LOCK CONTROL SWITCH SHIFT LOCK SOLENOID SLS+ SLS- STOP FUSE STOPLIGHT SWITCH UNLOCK WARNING SWITCH WHT WIRE

A/T BATTERY BATTERY GROUND BLK WIRE BLK/BLU WIRE BLK/RED WIRE BLK/YEL WIRE CLUTCH STARTER SWITCH DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPARTMENT) FUSE IGNITION SWITCH IH (AT RIGHT SIDE OF FIREWALL) JUNCTION CONNECTOR 19 LOCK M/T MAIN FUSE NCA WIRE PARK/NEUTRAL POSITION SWITCH (ON RIGHT SIDE OF TRANSMISSION) STARTER STARTER FUSE STARTER RELAY WHT WIRE WHT/BLK WIRE WHT/RED WIRE