Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| AFS ECU | Right side of dash. See Figure. |
| Air Suspension ECU | Behind right side of dash. See Figure. |
| Clearance Sonar ECU | On left side of luggage compartment. See Figure. |
| Climate Control Seat ECU (Driver's Seat) | Under right side of driver's seat. See Figure. |
| Climate Control Seat ECU (Front Passenger's Seat) | Under front passenger's seat. See Figure. |
| Climate Control Seat ECU (Rear LH Seat) | In left side of rear seat. See Figure. |
| Climate Control Seat ECU (Rear RH Seat) | In right side of rear seat. See Figure. |
| Cooling Fan ECU | On front center of engine compartment, on radiator support. See Figure. |
| Distance Control ECU | Behind right side of dash. See Figure. |
| Door Lock Control Receiver | Right rear of luggage compartment. See Figure. |
| Driver Door ECU | Inside front of left front door. See Figure. |
| Driver Seat ECU | Below left side of driver's seat. See Figure. |
| Driver Side J/B ECU | At left kick panel. See Figure. |
| Engine Control Module | On left front of engine compartment, in protective case. See Figure. |
| Front Controller | On engine room No. 2 R/B. See Figure. |
| Front Passenger Door ECU | Inside right front door. See Figure. |
| Gateway ECU | Behind left end of dash. See Figure. |
| Headlight Control ECU LH | Behind left headlight. See Figure. |
| Headlight Control ECU RH | Behind right headlight. See Figure. |
| Luggage Room J/B ECU | On left side of luggage compartment. See Figure. |
| Moon Roof Control ECU | At front of roof opening. See Figure. |
| Navigation ECU | On lower right side of luggage compartment. See Figure. |
| Passenger Side J/B ECU | At right kick panel. See Figure. |
| Power Tilt & Power Telescopic ECU | Behind left side of dash. See Figure. |
| PPS ECU | Right side of dash. See Figure. |
| Rear Door LH ECU | Inside left rear door. See Figure. |
| Rear Door RH ECU | Inside right rear door. See Figure. |
| Rear LH Seat ECU | Behind left side of rear seat back. See Figure. |
| Rear RH Seat ECU | Behind right side of rear seat back. See Figure. |
| Seat Climate Controller Front LH (Seat Back) | In driver's seat back. See Figure. |
| Seat Climate Controller Front RH (Seat Back) | In passenger's seat back. See Figure. |
| Seat Climate Controller Rear LH (Seat Back) | In left rear seat back. See Figure. |
| Seat Climate Controller Rear LH (Seat Cushion) | In left rear seat cushion. See Figure. |
| Seat Climate Controller Rear RH (Seat Back) | In right rear seat back. See Figure. |
| Seat Climate Controller Rear RH (Seat Cushion) | In right rear seat cushion. See Figure. |
| Shift Lock Control ECU | Below shift lever, in center console. See Figure. |
| Skid Control ECU W/Actuator | Behind left side of dash. See Figure. |
| Steering Lock ECU | Left side of dash. See Figure. |
| Stereo Component Tuner | On lower right side of luggage compartment. See Figure. |
| Television Camera ECU | Right rear of luggage compartment. See Figure. |
| Theft Deterrent ECU | Behind upper right center of dash. See Figure. |
| Transponder Key Computer | Behind upper center of dash. See Figure. |
| Vibration Seat ECU LH | Behind left rear seat back. See Figure. |
| Vibration Seat ECU RH | In rear seat assembly. See Figure. |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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