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 ES 300FACTORY OEM SERVICE PROCEDURE
Door Courtesy Switch Circuit Test
- Check that open door warning light is on when each door is opened and goes off when all doors are closed. If open door warning light operates as specified, go to next step. If door open warning light operation is not as specified, repair door switch circuit(s).
- Backprobe for voltage between door lock ECU harness connector terminal No. 14 and ground. See Figure. If battery voltage exists, circuit is okay. Return to TROUBLE SHOOTING . If battery voltage does not exist, repair open Red/White wire between door lock ECU and door courtesy 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.