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 SC 430FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| A/C Control Assembly | Behind center of dash. See Figure. |
| Airbag Sensor Assembly | Under front of center console. See Figure. |
| Blower Motor Controller | Behind right side of dash. See Figure. |
| Cooling Fan ECU | In front of engine compartment, near cooling fan assembly. See Figure. |
| Driver Door ECU | In driver's door. See Figure. |
| Driver Side J/B ECU | Behind left kick panel. See Figure. |
| Engine Control Module | At left side of engine compartment, in ECU box. See Figure. |
| Front Controller | On engine room No. 2 R/B. See Figure. |
| Gateway ECU | Behind right side of dash. See Figure. |
| Headlight Beam Level Control ECU | Behind left end of dash. See Figure. |
| Headlight Control ECU (Left/Right) | Behind respective headlight. See Figure. |
| Luggage Room J/B ECU | At left rear corner of luggage compartment. See Figure. |
| Navigation ECU | At right rear corner of luggage compartment. See Figure. |
| Passenger Door ECU | In right door. See Figure. |
| Passenger Side J/B ECU | Right side kick panel. See Figure. |
| Power Seat ECU (Driver's) | Under driver's seat. See Figure. |
| Power Seat ECU (Passenger's) | Under driver's seat. See Figure. |
| Seat Heater Controller (Driver's) | Under driver's seat. See Figure. |
| Seat Heater Controller (Passenger's) | Under passenger's seat. See Figure. |
| Shift Lock Control ECU | Under center console, near selector lever. See Figure. |
| Skid Control ECU | Behind left end of dash. See Figure. |
| Sliding Roof Control ECU | In left rear of luggage compartment. See Figure. |
| Telephone Computer | Center rear of luggage compartment. See Figure. |
| Theft Deterrent ECU | Behind left end of dash. See Figure. |
| Tilt & Telescopic ECU | Behind left end of dash. See Figure. |
| Tire Pressure Monitor Receiver | Behind center of dash, below radio. See Figure. |
| Transponder Key Computer | Left side of dash, behind gauge assembly. See Figure. |
| Wireless Door Lock Control Receiver | On center of roof header. See Figure. |
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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