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
Electrical Component Locator: Switches
SWITCHES LOCATION
| Component | Location |
|---|---|
| A/C High Pressure Switch | In refrigerant line, near receiver. |
| Brake Fluid Level Warning Switch | In master cylinder. |
| Cold Start Injector Time Switch | On intake manifold, below ISC valve. See Figure. |
| Coolant Level Warning Switch | In coolant recovery bottle. |
| Ignition Unlock Switch | Integral of ignition switch. |
| Neutral/Start Switch | On left side of transmission. See Figure. |
| Oil Pressure Switch | On left front side of engine block. |
| Stoplight Switch | On bracket, above brake pedal. |
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.