Lexus IS I (1999-2005) ih (at right side of firewall) Wiring diagrams

1 2 7 5 4 6 PRG RDA LGCY RCTY LSR DCTY 13 19 5 12 11 1 7 9 14 8 BDSU 3 4 1 IG BACKDOOR OPENER SWITCH (WAGON) BK (AT RIGHT FRONT FLOOR PANEL) BL (AT LEFT REAR QUARTERPANEL) BK (AT RIGHT FRONT FLOOR PANEL) BLK WIRE BLK/RED WIRE BLU WIRE BLU/RED WIRE BLU/YEL WIRE BN (AT RIGHT UPPER SIDE OF BACK PANEL) BODY ECU (BEHIND LOWER LEFT END OF DASH, INTEGRAL WITH DRIVER SIDE J/B) BRN WIRE BSUB DOME FUSE DOOR FUSE DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EB (AT CENTER LEFT SIDE OF INTAKE MANIFOLD) ECU-IG FUSE GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRY/BLU WIRE HOT AT ALL TIMES HOT IN ON OR ACC HOT IN ON OR START ID (AT LEFT SIDE OF FIREWALL) IGNITION KEY CYLINDER LIGHT IH (AT RIGHT SIDE OF FIREWALL) J/C 15 (BEHIND LEFT FENDERWELL) J/C 16 (ABOVE RIGHT REAR FENDER- WELL) J/C 16 (ABOVE RIGHT REAR FENDERWELL) J/C 5 (ABOVE DRIVER SIDE J/B) J/C 7 (BEHIND UPPER RIGHT SIDE OF DASH) LEFT FRONT DOOR COURTESY LIGHT LEFT FRONT DOOR COURTESY SWITCH LEFT REAR DOOR LOCK DETECTION SWITCH LT GRN WIRE LT GRN/BLK WIRE MPX-B FUSE ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PCLP DCLP PML PMUL LSWP PCTY RADIO 2 FUSE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RIGHT DOOR LOCK CONTROL SWITCH RIGHT FRONT DOOR COURTESY LIGHT RIGHT FRONT DOOR COURTESY SWITCH RIGHT FRONT DOOR LOCK DETECTION SWITCH RIGHT REAR DOOR LOCK DETECTION SWITCH SEDAN SIL CG SG SRS-B FUSE 7.5 WAGON WHT WIRE WHT/BLK WIRE YEL WIRE YEL/RED WIRE

A/T ACCEL POSITION SENSOR (ON CENTER REAR OF ENGINE, ON THROTTLE BODY) BLU WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE BRN/WHT WIRE BRN/YEL WIRE COMBINATION METER COMPUTER DATA LINES SYSTEM CONTROL MODULE) JUNCTION CONNECTOR 4 CONTROL MODULE) JUNCTION CONNECTORS 1, 2 CRUISE CRUISE CONTROL SWITCH CRUISE IND DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EA (AT FRONT OF INTAKE MANIFOLD) EB (AT CENTER LEFT SIDE OF INTAKE MANIFOLD) GRN/YEL WIRE HOT AT ALL TIMES IE (AT LEFT FRONT FLOOR PANEL CENTER) IG+ SE IH (AT RIGHT SIDE OF FIREWALL) JUNCTION CONNECTOR 7 (BEHIND UPPER M/T MPX-B FUSE OBD FUSE ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PNK/BLU WIRE RED WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RES/ACC SET/COAST SKID CONTROL ECU SPEEDOMETER THROTTLE POSITION SENSOR (ON THROTTLE BODY) VEHICLE SPEED SENSOR (COMBINATION METER) (M/T) VIO WIRE WHT/BLK WIRE WHT/RED WIRE

BLK WIRE BODY ECU (BEHIND LOWER LEFT END OF DASH, INTEGRAL WITH DRIVER SIDE J/B) BRN WIRE COMBINATION METER DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EC (AT LEFT FENDER APRON) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPARTMENT) ER EL FLASHER RELAY GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/YEL WIRE HAZARD SWITCH (A/C CONTROL ASSEMBLY) HAZD HOT AT ALL TIMES HOT IN ON IH (AT RIGHT SIDE OF FIREWALL) JUNCTION CONNECTOR 5 (BEHIND LEFT END OF DASH, ABOVE DRIVER ID SIDE J/B) JUNCTION CONNECTOR 7 (BEHIND UPPER RIGHT SIDE OF DASH) LEFT FRONT PARKING LIGHT LEFT FRONT SIDE MARKER LIGHT LEFT FRONT SIDE TURN SIGNAL LIGHT RIGHT FRONT TURN SIGNAL LIGHT LEFT FRONT TURN SIGNAL LIGHT LEFT TURN SIGNAL IND RIGHT TURN SIGNAL IND PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PNK WIRE RIGHT FRONT PARKING LIGHT RIGHT FRONT SIDE MARKER LIGHT RIGHT FRONT SIDE TURN SIGNAL LIGHT RIGHT LEFT TURN SIGNAL SWITCH (COMBINATION SWITCH) TURN, HAZ FUSE WHT WIRE YEL WIRE

BLK WIRE BODY ECU (BEHIND LOWER LEFT END OF DASH, INTEGRAL WITH DRIVER SIDE J/B) BRN WIRE COMBINATION METER DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) EC (AT LEFT FENDER APRON) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPARTMENT) ER EL FLASHER RELAY GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/YEL WIRE HAZARD SWITCH (A/C CONTROL ASSEMBLY) HAZD HOT AT ALL TIMES HOT IN ON IH (AT RIGHT SIDE OF FIREWALL) JUNCTION CONNECTOR 5 (BEHIND LEFT END OF DASH, ID ABOVE DRIVER SIDE J/B) JUNCTION CONNECTOR 7 (BEHIND UPPER RIGHT SIDE OF DASH) LEFT FRONT PARKING LIGHT LEFT FRONT SIDE MARKER LIGHT LEFT FRONT SIDE TURN SIGNAL LIGHT RIGHT FRONT TURN SIGNAL LIGHT LEFT FRONT TURN SIGNAL LIGHT LEFT TURN SIGNAL IND RIGHT TURN SIGNAL IND PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PNK WIRE RIGHT FRONT PARKING LIGHT RIGHT FRONT SIDE MARKER LIGHT RIGHT FRONT SIDE TURN SIGNAL LIGHT RIGHT LEFT TURN SIGNAL SWITCH (COMBINATION SWITCH) TURN, HAZ FUSE WHT WIRE YEL WIRE

+B HI DRL 1 2 3 4 5 6 7 8 9 10 IG BLK WIRE BLK/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE COMBINATION METER DAYTIME RUNNING LIGHT RESISTOR (ON RIGHT SIDE OF ENGINE COMPT, ON STRUT TOWER) DIMMER RELAY DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) DRL 1 FUSE DRL 2 FUSE EC (AT LEFT FENDER APRON) ECU-IG FUSE ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPARTMENT) ENGINE ROOM 2 R/B (ON RIGHT REAR OF ENGINE COMPARTMENT) ENGINE ROOM 3 R/B (ON LEFT SIDE OF ENGINE COMPARTMENT) FR FOG FUSE FR FOG RELAY FUSE H-LP L LWR FUSE H-LP R LWR FUSE H-LP R UPR FUSE H-LP L UPR FUSE HEAD LP RELAY HI BEAM INDICATOR HOT AT ALL TIMES HOT IN ON OR START DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) IH (AT RIGHT SIDE OF FIREWALL) IND PKB CHG- JUNCTION CONNECTOR 6 (BEHIND LEFT SIDE OF DASH, FORWARD OF INSTRUMENT CLUSTER) JUNCTION CONNECTOR 7 (BEHIND UPPER RIGHT SIDE OF DASH) LEFT FRONT FOG LIGHT LEFT HEADLIGHT CONTROL ECU (BEHIND LEFT HEADLIGHT ASSEMBLY) LEFT HIGH BEAM HEADLIGHT MAIN DAYTIME RUNNING LIGHT RELAY (BEHIND LEFT END OF DASH) MAIN FUSE PARKING BRAKE SWITCH (AT BASE OF PARKING LEVER) PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RIGHT FRONT FOG LIGHT RIGHT HEADLIGHT CONTROL ECU (BEHIND RIGHT HEADLIGHT ASSEMBLY) RIGHT HIGH BEAM HEADLIGHT WHT/BLK WIRE WHT/RED WIRE YEL WIRE YEL/RED WIRE

1 12 HEAD 2 3 1 SHB SHG SHFL ANTI-LOCK BRAKES SYSTEM BLK WIRE BLK/BLU WIRE BLK/ORG WIRE BLK/RED WIRE BLU WIRE BLU/WHT WIRE BLU/YEL WIRE BRN WIRE COMBINATION METER HEADLIGHT BEAM LEVEL CONTROL WARNING LIGHT COMBINATION SWITCH DIMMER SWITCH DIODE (FOG LIGHT) DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ECU-IG FUSE ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPT) GAUGE FUSE GRN/BLK WIRE GRN/ORG WIRE GRN/WHT WIRE HEAD LP RELAY HEADLIGHT BEAM LEVEL CONTROL ECU (BEHIND LEFT END OF DASH) HOT AT ALL TIMES HOT IN ON OR START IH (AT RIGHT SIDE OF FIREWALL) JUNCTION CONNECTOR 5 (BEHIND LEFT END OF DASH, ABOVE DRIVER SIDE J/B) JUNCTION CONNECTOR 7 (BEHIND UPPER RIGHT SIDE OF DASH) LEFT FRONT HEIGHT CONTROL SENSOR (ON LEFT FRONT OF ENGINE COMPT) LEFT HEADLIGHT BEAM LEVEL CONTROL ACTUATOR (BEHIND LEFT HEADLIGHT) LIGHT CONTROL SWITCH MAIN FUSE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RED WIRE RED/BLK WIRE RED/BLU WIRE RED/GRN WIRE RED/WHT WIRE RED/YEL WIRE RIGHT HEADLIGHT BEAM LEVEL CONTROL ACTUATOR (BEHIND RIGHT HEADLIGHT) SGF SGR LHE RHT LHT RH+ LH+ SHFL WNG SHRL SHB SHG TAIL HEAD AUTO OFF THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL 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

2 1 (A/T) (M/T) 6 3 (M/T) (A/T) A/C CONTROL ASSEMBLY ASHTRAY ILLUMI- NATION BLK WIRE BRN WIRE CIGARETTE LIGHTER ILLUMI- NATION COMBINATION METER ILLUMINATION (COMBINATION METER) DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ELECTRONIC CONTROLLED TRANSMISSION PATTERN SELECT SWITCH (A/T) GLOVE BOX LIGHT GRN WIRE HEAD- LIGHT CLEANER SWITCH HOT AT ALL TIMES IH (AT RIGHT SIDE OF FIREWALL) J/C 5 (ABOVE DRIVER SIDE J/B) J/C 7 (BEHIND UPPER RIGHT SIDE OF DASH) J/C 8 (BEHIND UPPER RIGHT SIDE OF DASH) J/C 9 (BEHIND UPPER RIGHT SIDE OF DASH) LIGHT CONTROL SWITCH COMBINATION SWITCH MULTI-DISPLAY OFF HEAD PANEL FUSE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RADIO, PLAYER REAR FOG LIGHT SWITCH RED WIRE REMOTE CONTROLLER (NAVIGATION) RHEOSTAT SEAT HEATER SWITCH (DRIVER) SEAT HEATER SWITCH (FRONT PASSENGER) TAIL TAIL RELAY THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) TAIL TRACTION "OFF" SWITCH (A/T) TRACTION "OFF" SWITCH, SNOW SWITCH (M/T) TRANSMISSION CONTROL SWITCH (A/T SHIFT POSITION ILLUMINATION) (A/T) WHT WIRE WHT/GRN WIRE

ALT FUSE BLK WIRE BLU WIRE BM (AT LEFT UPPER SIDE OF BACK PANEL) NOISE FILTER (REAR WINDOW DEFOGGER) BODY ECU DFG COMBIN -ATION METER MPX- DEFOGGER, MIRROR HEATER SWITCH (A/C CONTROL ASSEMBLY) MPX- MHTR DRIVER SIDE J/B (BEHIND LOWER LEFT END OF DASH) ENGINE CONTROL MODULE (ON LEFT FRONT OF ENGINE COMPT) ENGINE ROOM 1 R/B (ON RIGHT REAR OF ENGINE COMPT) GAUGE FUSE GRN WIRE GRN/ORG WIRE HOT AT ALL TIMES HOT IN ON OR START IH (AT RIGHT SIDE OF FIREWALL) J/C 11 (IN LEFT FRONT DOOR) J/C 5 (BEHIND LEFT END OF DASH) LEFT MIRROR HEATER (LEFT REMOTE CONTROL MIRROR) MIR HTR FUSE MIR HTR RELAY MPX NOISE FILTER (DEF CDS) ORG/ WIRE PASSENGER SIDE J/B (BELOW LOWER RIGHT END OF DASH) PASSENGER SIDE J/B (BELOW LOWER RIGHT END OF DASH) REAR WINDOW DEFOGGER RED WIRE RIGHT MIRROR HEATER (RIGHT REMOTE CONTROL MIRROR) RR DEF FUSE RR DEF RELAY THEFT DETERRENT ECU (BEHIND LEFT END OF DASH) WAGON SEDAN WHT WIRE WHT/BLK WIRE

+B +BM A/C SYSTEM ACCEL POSITION SENSOR (ON CENTER REAR OF ENGINE, ON THROTTLE BODY) ANTI-THEFT SYSTEM 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/YEL WIRE CIRCUIT OPENING RELAY CLSW 4 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 CODE COMPUTER DATA LINES SYSTEM CRUISE CONTROL SYSTEM DATA LINK CONNECTOR 3 (BEHIND LOWER LEFT SIDE OF DASH) EC (AT LEFT FENDER APRON) EFI FUSE ETCS FUSE EFI RELAY ENG ENGINE CONTROL MODULE (ECM) (ON LEFT FRONT OF ENGINE COMPT, IN PROTECTIVE CASE) ENGINE ROOM R/B 1 (ON RIGHT REAR OF ENGINE COMPT) ENGINE ROOM R/B 2 (ON RIGHT REAR OF ENGINE COMPT) FPS GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY/BLK WIRE GRY/GRN WIRE GRY/RED WIRE HOT AT ALL TIMES IH (AT RIGHT SIDE OF FIREWALL) IMLD CODE J/C 1, J/C 2 (NEAR ECM) J/C 3 (NEAR ECM) KSW STA MREL FC FPR ACMG IGSW LT GRN WIRE LT GRN/BLK WIRE NEO NEO TBP SPD 2 PNK WIRE ORG/ WIRE PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) PNK 17 18 19 20 WIRE PNK WIRE PNK/BLK WIRE PNK/BLU WIRE PTNK RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RXCK SIL SKID CONTROL ECU (BEHIND LEFT END OF DASH) STARTING/CHARGING SYSTEM SUPPLEMENTAL RESTRAINTS SYSTEM TACH TC STP SFTD SFTU TRC+ TRC+ ENG+ TRC- ENG- CCS PNK WIRE TXCT VAPOR PRESSURE SENSOR (UNDER CENTER REAR OF VEHICLE) VCC VIO WIRE W/M/T WFSE WFSE TXCT RXCK PTNK WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE YEL/GRN WIRE YEL/RED WIRE