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 ES 300 AutomaticFACTORY OEM SERVICE PROCEDURE
System Tests: Notes
SYSTEM TEST INDEX
| Symptom | Perform Test |
|---|---|
| ECU Power Source Circuit (Wireless Door Lock Control System) | 1 |
| Door Unlock Detection Switch Circuit (Wireless Door Lock Control System) | 2 |
| Door Key Lock & Unlock Switch Circuit (Unlock Side) | 3 |
| Door Key Lock & Unlock Switch Circuit (Lock Side) | 4 |
| Key Unlock Warning Switch Circuit (Wireless Door Lock Control System) | 5 |
| Door Courtesy Switch Circuit | 6 |
| Wireless Door Lock ECU | 7 |
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.