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.
1990 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
Stoplight Switch
- Brake pedal height and free play must be set before adjusting stoplight switch. See BRAKE PEDAL HEIGHT & FREE PLAY under ADJUSTMENTS. Remove undercover panel. Remove lower pad and air duct. Remove power steering ECU.
- Loosen lock nut, and adjust stoplight switch until it lightly contacts brake pedal stopper in rest position. Ensure stoplights work correctly. Install air duct and undercover panel.
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.