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.
1992 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location | |
|---|---|---|
| ABS ECU | Under left front floorboard. See Figure. | |
| A/C Control Unit | Behind A/C control panel. | |
| Anti-Theft/Door Lock ECU | Behind instrument cluster. See Figure. | |
| Cooling Fan ECU (SC400) | Under right side of dash, behind glove compartment. See Figure. | |
| Cruise Control ECU | Behind left side of dash. See Figure. | |
| Elec. Controlled Trans. (ECT) ECU | Under left front floorboard. See Figure. | |
| Engine ECU | ||
| View of Dash | Under left front floorboard. See Figure. | |
| Harness Layout | Under left front floorboard. See Figure. | |
| Fuel Pump ECU | ||
| Location of Control Units | Behind left rear quarter panel. See Figure. | |
| Harness Layout | Behind left rear quarter panel. See Figure. | |
| Power Seat ECU | ||
| Driver Seat | Under driver's seat. See Figure. | |
| Passenger Seat | Under front passenger's seat. See Figure. | |
| Progressive Power Steering (PPS) ECU | Under right side of dash. See Figure. | |
| Remote Control Mirror ECU | Behind left center of dash. See Figure. | |
| Shift Lock Control ECU | ||
| View of Dash | Under center console, left of shifter. See Figure. | |
| View of Dash From Passenger Side | Under center console, left of shifter. See Figure. | |
| Tilt & Power Telescopic Steering Column ECU | Behind left side of dash. See Figure. | |
| Traction Control System (TRAC) ECU | Behind right side of dash. See Figure. | |
| Wireless Door Lock ECU | Behind right rear quarter panel, below window. 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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