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.
1997 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Control Units
CONTROL UNITS
| Component | Component Location |
|---|---|
| ABS ECU | Behind right side of dash. See Figure. |
| ABS & Traction ECU | Behind right side of dash. See Figure. |
| A/C System ECU | Behind center of console, integral of A/C control assembly. |
| Air Suspension ECU (USA) | Behind right side of dash. See Figure. |
| Body ECU | Behind left side of dash. See Figure. |
| Cruise Control ECU | Behind right side of dash. See Figure. |
| Driver Door ECU | In driver's door. See Figure. |
| Engine Control Module (ECM) | Behind right side of dash. See Figure. |
| Passenger Door ECU (Front) | In front passenger's door. See Figure. |
| Power Seat ECU | Under driver's seat. |
| Progressive Power Steering ECU | Behind left side of dash above steering column. See Figure. |
| Shift Lock ECU | Under center console, on base of gear selector. See Figure. |
| Tilt & Telescopic ECU | Behind left side of dash, above steering column. See Figure. |
| Transmission ECU | Behind right side of dash, integral of engine ECU. |
| Wireless Door Lock Control ECU | Behind right side of dash. See Figure. |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.