Lexus RX I (1997-2003) body ecu (behind left side of dash) Wiring diagrams

1 2 5 6 9 11 17 RDR+ BECU SH RDR- 13 12 5 12 MPX+ MPX- 18 19 BDSU BDSL 2 5 6 10 11 13 14 16 17 18 19 23 24 25 A- SIG KL 21 17 MPX+ MPX- 5 6 8 BCTY HCTY KSW A+ BDR LSW CTY CPUB KUL CTYE LSWE GND BLK WIRE BLK/ORG WIRE BLU WIRE BLU/BLK WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BSUB IG IND COMBINATION METER ECU D RR DOOR FUSE DOOR LOCKS SYSTEM DRIVER DOOR ECU (IN LEFT FRONT DOOR) ENGINE CONTROL MODULE (BEHIND RIGHT SIDE OF DASH) FRONT PASSENGER DOOR ECU (IN RIGHT FRONT DOOR) GAUGE FUSE GRN/BLK WIRE GRY WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN ON OR START IMLD INSTRUMENT CONTROL PANEL INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) J/B 3 (BEHIND UPPER CENTER OF DASH) J/C 5 (BEHIND UPPER LEFT SIDE OF DASH) J/C 9 (BEHIND RIGHT KICK PANEL) LEFT FRONT DOOR COURTESY SWITCH LSWA LT GRN WIRE LT GRN/BLK WIRE LT GRN/RED WIRE P FR DOOR FUSE P RR DOOR FUSE PNK WIRE PNK/BLU WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RIGHT FRONT DOOR COURTESY SWITCH THEFT DETERRENT INDICATOR LIGHT VIO WIRE WHT WIRE WHT/BLK (OR YEL/RED) WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/RED WIRE

2 6 PRE ACMG 2 LT A/C CONDENSER FAN MOTOR (IN RIGHT FRONT OF ENGINE COMPT) A/C MAGNETIC CLUTCH, LOCK SENSOR (ON A/C COMPRESSOR ASSEMBLY) BLK WIRE BLK/ORG WIRE BLK/YEL WIRE BLOWER MOTOR (BEHIND RIGHT SIDE OF DASH) BLOWER MOTOR CONTROL RELAY (NEAR BLOWER MOTOR) BLU WIRE BLU/BLK WIRE BLU/ORG WIRE BLU/RED WIRE BLU/YEL WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BRN WIRE COMPUTER DATA LINES SYSTEM DIODE (A/C) (BEHIND UPPER LEFT SIDE OF DASH) DOME FUSE ECU-B FUSE ENGINE CONTROL MODULE (BEHIND RIGHT SIDE OF DASH) ENGINE ROOM J/B (ON LEFT SIDE OF ENGINE COMPT) FAN 1 RELAY FAN 2 RELAY FAN 3 RELAY GND SI B+ GRN WIRE GRN/RED WIRE HEATER RELAY (ON INSTRUMENT PANEL J/B) HOT AT ALL TIMES INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) J/B 5 (BEHIND UPPER LEFT SIDE OF DASH) J/C 1 J/C 10 (BEHIND RIGHT SIDE OF DASH) J/C 2 J/C 4 (BEHIND LEFT KICK PANEL) J/C 9 LCKI LT GRN/BLK WIRE M- M+ MG CLT RELAY PNK/BLU WIRE R/B 2 (IN ENGINE ROOM J/B) RADIATOR FAN MOTOR (IN LEFT FRONT OF ENGINE COMPT) RED WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE WATER TEMPERATURE SWITCH 1 (IN RIGHT FRONT OF ENGINE COMPT) WATER TEMPERATURE SWITCH 2 (ON TOP REAR OF ENGINE) WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE

AIR CONDITIONING SYSTEM HEADLIGHTS SYSTEM ANTI-THEFT SYSTEM DOOR LOCKS SYSTEM WIPER/WASHER SYSTEM ANTI-THEFT, ENGINE CONTROLS SYSTEMS BCTY HCTY DBKL KSW HR ILE BLK WIRE BLK/ORG WIRE BLU WIRE BLU/BLK WIRE BLU/ORG WIRE BLU/RED WIRE BLU/WHT WIRE BLU/YEL WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BRN/WHT WIRE BRN/YEL WIRE BSUB IG FFGO TRLY PWR CLTE BZR CLTS COMPUTER DATA LINES SYSTEM DOOR LOCKS SYSTEM DOOR LOCKS SYSTEM (W/KEYLESS ENTRY) DOOR LOCKS, HEADLIGHTS, INTERIOR LIGHTS, POWER WINDOWS SYSTEMS DRL HEAD TAIL LSWA EXTERIOR LIGHTS SYSTEM HEADLIGHTS SYSTEM GAUGE FUSE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HAZ CLTB HEADLIGHTS SYSTEM HEADLIGHTS SYSTEM EXTERIOR LIGHTS SYSTEM TRANSMISSIONS SYSTEM HEADLIGHTS SYSTEM HORN HORNS SYSTEM HOT AT ALL TIMES HOT IN ACC OR ON HOT IN ON OR START INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) J/B 3 (BEHIND UPPER CENTER OF DASH) J/C 5 (BEHIND UPPER LEFT SIDE OF DASH) LT GRN WIRE LT GRN/BLK WIRE LT GRN/RED WIRE P FR DOOR FUSE PNK WIRE PNK/BLK WIRE POWER TOPS SYSTEM RADIO 2 FUSE RCO RDA RSSI BDSU BDSL RDR+ RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RR WIP FUSE RWLM RWIG SH RDR- RWSW WIG RWLS RWW SNOW IND DFG STPI PKB HF TRANSMISSIONS SYSTEM ANTI-THEFT SYSTEM DEFOGGER SYSTEM W/AUTO LAMPS WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE WIPER/WASHER SYSTEM YEL WIRE YEL/BLK WIRE

1 2 3 4 5 6 7 C/C 10 5 TC PI 12 19 SIL TC 3 4 TC TS 5 12 13 12 MPX+ MPX- ABS, BA, TRAC, VSC ECU (BEHIND RIGHT SIDE OF DASH) BLK/ORG WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BRN WIRE BRN/WHT WIRE CENTER AIR BAG SENSOR ASSEMBLY (UNDER CENTER OF DASH) CG SG COMBINATION METER ECU (BEHIND COMBINATION METER) CRUISE CONTROL ECU (BEHIND LEFT SIDE OF DASH) CRUISE IND DATA LINK CONNECTOR (DLC) 3 (UNDER LEFT SIDE OF DASH) DRIVER DOOR ECU (IN LEFT FRONT DOOR) ENGINE CONTROL MODULE (BEHIND RIGHT SIDE OF DASH) FRONT PASSENGER DOOR ECU (IN RIGHT FRONT DOOR) HOT AT ALL TIMES INSTRUMENT CONTROL PANEL INSTRUMENT PANEL J/B J/B 5 (BEHIND UPPER LEFT SIDE OF DASH) LEFT REAR DOOR ECU (IN LEFT REAR DOOR MOON ROOF CONTROL ECU (ON FRONT CENTER OF MOON ROOF) MPX MULTI-DISPLAY OBD FUSE ORG/ WIRE PNK/BLK WIRE POWER SEAT ECU (UNDER DRIVER'S SEAT) RIGHT REAR DOOR ECU (IN RIGHT REAR DOOR) SIL TAC TACH TC TS VIO WIRE W/O NAVIGATION W/ NAVIGATION WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/RED WIRE YEL WIRE YEL/BLK WIRE YEL/RED WIRE

12 13 12 5 MPX- MPX+ 15 16 17 RCO RDA RSSI 2 9 11 BECU 4 5 10 11 14 17 18 21 23 25 CYL SIG 5 10 BCTY ILE BDR CTY CPUB CTYB CTYE GND BLK WIRE BLK/ORG WIRE BLU WIRE BLU/BLK WIRE BLU/WHT WIRE BLU/YEL WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BSUB IG COMBINATION METER ECU CTY SIG BDR CPUB CTYE GND D RR DOOR FUSE DRIVER DOOR ECU (IN LEFT FRONT DOOR) ENGINE CONTROL MODULE (BEHIND RIGHT SIDE OF DASH) FRONT PASSENGER DOOR ECU (IN RIGHT FRONT DOOR) GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/WHT WIRE HOT AT ALL TIMES HOT IN ON OR START INSTRUMENT CONTROL PANEL INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) J/B 3 (BEHIND UPPER CENTER OF DASH) J/C 3, J/C 4 (LEFT KICK PANEL) J/C 5 (TOP OF LEFT KICK PANEL) J/C 9 (RIGHT END OF DASH) LEFT FRONT DOOR COURTESY LIGHT LEFT FRONT DOOR COURTESY SWITCH LEFT REAR DOOR COURTESY SWITCH LEFT REAR DOOR ECU (IN LEFT REAR DOOR LT GRN WIRE OPEN DOOR INDICATOR P FR DOOR FUSE P RR DOOR FUSE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RIGHT FRONT DOOR COURTESY LIGHT RIGHT FRONT DOOR COURTESY SWITCH SOLID STATE VCC CODE SQ VIO WIRE W/ NAV W/O NAV WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE WIRELESS DOOR LOCK ECU (IN CENTER OF VEHICLE) YEL WIRE YEL/BLK WIRE YEL/RED WIRE

BLK WIRE BLU WIRE BLU/BLK WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) DFG ENGINE ROOM JUNCTION BLOCK (ON LEFT SIDE OF ENGINE COMPARTMENT) FR DEF FUSE FRONT WINDOW DEFOGGER FUSIBLE LINK BLOCK (IN ENGINE ROOM JUNCTION BLOCK) GAUGE FUSE GRY WIRE GRY/RED WIRE HEATER FUSE HOT AT ALL TIMES HOT IN ON OR START INSTRUMENT PANEL JUNCTION BLOCK (BEHIND LEFT SIDE OF DASH) J/C 14 (IN LEFT SIDE OF TAILGATE) J/C 5 (BEHIND UPPER LEFT SIDE OF DASH) J/C 5 (LEFT KICK PANEL) J/C 9 (BEHIND RIGHT KICK PANEL) LEFT REMOTE CONTROL MIRROR MIRROR HEATER MIRROR HEATER MIRROR HEATER RELAY (IN RELAY BLOCK 1) NOISE FILTER (REAR WINDOW DEFOGGER) REAR DEFOG RELAY RED WIRE RED/YEL WIRE RIGHT REMOTE CONTROL MIRROR RR DEF FUSE WHT WIRE WHT/BLK WIRE YEL WIRE

1 2 3 4 5 6 7 8 IG LR LL +B EL ER GND EHW 7 11 TRLY HAZ BLK WIRE BLU WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) GAUGE FUSE GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE HAZARD SWITCH HEAD OFF HOT AT ALL TIMES HOT IN ON OR START ILLUM ILLUM INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) J/B 5 (BEHIND UPPER LEFT SIDE OF DASH) J/C 1 (IN ENGINE COMPARTMENT, ON RIGHT FRONT FENDER) J/C 11 (IN LEFT SIDE LUGGAGE COMPT) J/C 12 (IN LEFT SIDE OF LUGGAGE COMPARTMENT) J/C 14 (IN LEFT SIDE OF LIFTGATE) J/C 2 (IN LEFT FRONT OF ENGINE COMPARTMENT, BEHIND HEADLIGHT) J/C 7 (UPPER LEFT SIDE OF DASH) J/C 9 (BEHIND RIGHT KICK PANEL) LEFT LEFT FRONT SIDE MARKER LIGHT LEFT PARKING LIGHT LEFT REAR COMBINATION LIGHT LEFT REAR SIDE MARKER LIGHT LEFT REAR TURN SIGNAL LIGHT LEFT STOP LIGHT LEFT STOP LIGHT LEFT TAIL LIGHT LICENSE PLATE LIGHT LIGHT CONTROL SWITCH (PART OF COMBINATION SWITCH) LT GRN/BLK WIRE ORG/ WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/YEL WIRE RIGHT RIGHT FRONT SIDE MARKER LIGHT RIGHT PARKING LIGHT STPI TAIL TAIL FUSE TAILLIGHT RELAY TURN SIGNAL FLASHER TURN SIGNAL SWITCH (PART OF COMBINATION SWITCH) WHT WIRE WHT/BLK WIRE YEL WIRE

1 2 3 4 CLTB 2 12 14 15 16 BECU HRLY DRL HEAD TAIL 21 17 MPX+ MPX- 5 6 7 9 12 20 21 IG FFGO TRLY CLTE CLTB 8 19 20 KSW PKB HF AUTOMATIC LIGHT CONTROL SENSOR BDR CTY CPUB CTYE GND BLK WIRE BLK/ORG WIRE BLU WIRE BLU/BLK WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BRN/WHT WIRE CLTE CLTS CLTS COMBINATION METER ECU COMBINATION SWITCH DIMMER SWITCH DRIVER DOOR ECU (IN LEFT FRONT DOOR) ECU-B FUSE DOME FUSE ENGINE ROOM J/B (ON LEFT SIDE OF ENGINE COMPARTMENT) F/L DOOR FUSE FOGLIGHT SWITCH GRN WIRE GRN/BLK WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE H-LP L LWR FUSE H-LP R LWR FUSE HEADLAMP RELAY HIGH HIGH FLASH FLASH LOW LOW HIGH LOW FLASH HOT AT ALL TIMES HU FFOG INSTRUMENT CONTROL PANEL INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) J/B 5 (BEHIND UPPER LEFT SIDE OF DASH) J/C 1 (IN ENGINE COMPARTMENT, ON RIGHT FRONT FENDER) J/C 2 (IN LEFT FRONT OF ENGINE COMPARTMENT, BEHIND HEADLIGHT) J/C 5 (TOP OF LEFT KICK PANEL) J/C 7 (UPPER LEFT END OF DASH) J/C 9 (BEHIND RIGHT KICK PANEL) LEFT FRONT DOOR COURTESY SWITCH LEFT LOW BEAM HEADLIGHT LIGHT CONTROL SWITCH LT GRN WIRE LT GRN/RED WIRE MAIN FUSE MPX OFF PNK WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE RIGHT LOW BEAM HEADLIGHT TAIL HEAD OFF AUTO UNLOCK WARNING SWITCH W/ HID W/O HID W/O HID W/ HID WHT WIRE WHT/BLK WIRE YEL/BLK WIRE YEL/RED WIRE

BODY ECU (BEHIND LEFT SIDE OF DASH) COMBINATION SWITCH ENGINE ROOM J/B GRN/WHT WIRE HORN FUSE HORN RELAY HORN SWITCH HOT AT ALL TIMES LEFT HORN RIGHT HORN WHT/RED WIRE

12 13 14 15 16 17 ODMS 2 3 4 5 6 7 8 9 10 A/C SYSTEM PRE TBP 2 3 4 5 6 7 8 9 10 SLT- SLT+ NT- NT+ A/C SYSTEM LCKI A/T INDICATOR SWITCH (INTEGRAL TO PARK/NEUTRAL POSITION SWITCH) (ON TRANSAXLE) ABS, BA, TRAC, VSC ECU (BEHIND RIGHT SIDE OF DASH) BATT IGSW FC SIL 2 3 4 5 6 7 8 9 10 BLK WIRE BLK/ORG WIRE BLK/RED WIRE BLK/WHT WIRE BLK/YEL WIRE BLU WIRE BLU/ORG WIRE BLU/RED WIRE BLU/YEL WIRE BODY ECU (BEHIND LEFT SIDE OF DASH) BRN/WHT WIRE COMPUTER DATA LINES SYSTEM 12 13 14 15 16 17 18 19 20 21 22 ECT EFI ELECTRONICALLY CONTROLLED ENGINE CONTROL MODULE (BEHIND RIGHT SIDE OF DASH) GENERATOR RL NEO GRN WIRE GRN/BLK WIRE GRN/ORG WIRE GRN/RED WIRE GRN/WHT WIRE GRN/YEL WIRE GRY WIRE GRY/BLU WIRE HOT IN ON OR START INSTRUMENT PANEL J/B (BEHIND LEFT SIDE OF DASH) GAUGE FUSE IDL IDLO CF TACH CODE COOLING FANS SYSTEM J/C 8 (BEHIND RIGHT SIDE OF DASH) LT GRN WIRE LT GRN/BLK WIRE MOPS NEO O/D MAIN SWITCH (BELOW CENTER CONSOLE) ORG/ WIRE OXS HTS PNK WIRE PNK/BLK WIRE RED WIRE RED/BLK WIRE RED/BLU WIRE RED/WHT WIRE RED/YEL WIRE SPD KSW STA MREL ODLP CCV TC ACMG A/C SYSTEM TRANSMISSION SOLENOID (IN TRANSAXLE) TRANSPONDER KEY AMPLIFIER (IN STEERING COLUMN) TRC+ TRC+ ENG+ STP B+ PTNK TRC- ENG- IMLD TXCT RXCK NSW PNK WIRE UNLOCK WARNING SWITCH VIO WIRE VIO/WHT WIRE WHT WIRE WHT/BLK WIRE WHT/BLU WIRE WHT/RED WIRE YEL WIRE YEL/GRN WIRE