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.
2003 Lexus LS 430FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Component Location |
|---|---|
| A/C Control Assembly | Behind right side of dash. See Figure. |
| Air Bag Sensor Assembly | Behind lower center of dash, on transmission tunnel. 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) | Under right side of driver's seat. |
| Climate Control Seat ECU (Front Passenger) | Under front passenger's seat. |
| Cooling Fan ECU | On front center of engine compartment, on radiator support. See Figure. |
| Distance Control ECU | Behind right side of dash. See Figure. |
| Driver Door ECU | Inside front of left front door. See Figure. |
| Driver Seat ECU | Below left side of driver's seat. |
| 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. |
| Front Passenger Door ECU | Inside right front door. See Figure. |
| Gateway ECU | Behind left end of dash. See Figure. |
| Headlight Beam Level Control ECU | Behind right side of dash. See Figure. |
| Headlight Control ECU (Left) | Behind left headlight. See Figure. |
| Headlight Control ECU (Right) | 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. |
| Rear A/C Unit | On left side of luggage compartment. |
| Rear Door ECU (Left) | Inside left rear door. See Figure. |
| Rear Door ECU (Right) | Inside right rear door. See Figure. |
| Rear Seat ECU (Left/Right) | Behind respective rear seat back. |
| Shift Lock Control ECU | Below shift lever, in center console. See Figure. |
| Skid Control ECU | Behind left side of dash. See Figure. |
| Stereo Component Tuner | On lower right side 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 (Left/Right) | Behind respective rear seat back. |
Factory Service Tools
Use the Manual With the Right Hardware
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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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