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.
1992 Lexus LS 400FACTORY OEM SERVICE PROCEDURE
A/C Pressure Switch
- Install A/C pressure gauge set. To access pressure switch , remove right headlight. Pressure switch is in-line with A/C receiver. Turn A/C selector switch to OFF position. High side pressure should be 142 psi (10 kg/cm2 ) or less.
- Disconnect switch terminal connector. Using a DVOM, check for continuity between switch terminals No. 2 (ohmmeter positive lead) and No. 3 (ohmmeter negative lead). See Fig 1.
- Turn A/C selector switch to ON position. High side pressure should be 192 psi (13.5 kg/cm2 ) or more. No continuity should exist between switch terminals No. 2 and No. 3. If A/C pressure switch continuity is not correct, replace switch.
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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