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.
1994 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS LOCATION
| Component | Location |
|---|---|
| ABS ECU | Behind right side of dash. See Figure & Figure . |
| A/C Control Assembly | Behind center of console, integral of A/C control assembly. See Figure & Figure . |
| Anti-Theft ECU | Behind left side of dash, above fuse/relay block. See Figure & Figure . |
| Coolant Level Warning ECU | Behind left side of dash, left of steering column. See Figure. |
| Cruise Control ECU | Behind left side of dash. See Figure & Figure . |
| Elect. Side Mirrors ECU | Behind right side of dash. See Figure & Figure . |
| Electronic Modulated Air Suspension ECU | In right rear corner of luggage compartment. See Figure. |
| Engine ECU | Behind right side of dash. See Figure, Figure & Figure . |
| Power Door Lock ECU | Behind left side of dash, integral of anti-theft ECU. See Figure & Figure . |
| Power Seat ECU | Under driver's seat. See Figure. |
| Progressive Power Steering ECU | Behind center of dash. See Figure & Figure . |
| Shift Lock ECU | Under center console, on base of gear selector. See Figure & Figure . |
| Tilt & Telescopic Steering Column ECU | Behind left side of dash, above steering column. See Figure & Figure . |
| TRAC ECU | Behind right side of dash, integral of ABS ECU. See Figure & Figure . |
| Transmission ECU | Behind right side of dash, integral with engine ECU. See Figure, Figure & Figure . |
| Wireless Door Lock Control Unit | In left side of luggage compartment. |
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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