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
Body ECU Inspection
- Apply water to windshield before operating wipers. Turn wiper switch to INT position. If wiper operates in INT position, go to next step. If wiper does not operate in INT position, inspect wiper/washer system. See WIPER/WASHER SYSTEM article. If wiper/washer system is okay, check body ECU. See BODY ECU under PIN VOLTAGE TESTS. If wiper/washer is not okay, repair or replace components as necessary.
- Open any door. Open door indicator light should glow. If open door indicator light glows, see RETRIEVING TROUBLE CODES . If open door indicator light does not glow, repair or replace open door indicator light as necessary.
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.