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.
1996 Lexus SC 400FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS
| Component | Component Location |
|---|---|
| ABS ECU (W/O Traction Control) | Under right front floorboard. See Figure. |
| ABS & Traction ECU (W/ Traction Control) | Under right front floorboard. See Figure. |
| Cooling Fan ECU | Under right side of dash, behind glove compartment. See Figure. |
| Cruise Control ECU | Behind left side of dash. See Figure. |
| Driver's Power Seat ECU | Under driver's seat. |
| Engine Control Module (View 1) | Under right front floorboard. See Figure. |
| Engine Control Module (SC300) (View 2) | Under right front floorboard. See Figure. |
| Engine Control Module (SC400) (View 2) | Under right front floorboard. See Figure. |
| Fuel Pump ECU (SC300) | Behind left rear quarterpanel. See Figure. |
| Fuel Pump ECU (SC400) | Behind left rear quarterpanel. See Figure. |
| Passenger's Power Seat ECU | Under front passenger's seat. |
| 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 ECU (View 1) | Under center console, front of shifter. See Figure. |
| Shift Lock ECU (View 2) | Under center console, left of shifter. See Figure. |
| Theft Deterrent & Door Lock Control ECU | Behind left side of dash. See Figure. |
| Tilt & Power Telescopic ECU (A/T) | Behind left side of dash. See Figure. |
| Tilt & Power Telescopic ECU (M/T) | Behind right side of dash. See Figure. |
| Traction ECU | Behind right side of dash. See Figure. |
| Wireless Door Lock Control ECU | Behind right rear quarterpanel, below window. |
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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