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.
Door Unlock Detection Switch
Remove door trim and door lock assembly. Locate and disconnect unlock detection switch. On Tercel with power door locks, check for continuity between 4-pin connector terminals No. 1 (left front is Pink/Blue wire, right front is Pink wire, and rear is Red/Yellow wire) and No. 3 (White/Black wire). On Tercel without power door locks, check for continuity exists between 2-pin terminals No. 1 (left front is Pink/Blue wire, right front is Pink wire, and rear is Red/Yellow wire) and No. 2 (White/Black wire). There should be continuity when door lock is in unlocked position. There should be no continuity when door lock is in locked position. If continuity is not as specified replace door unlock detection switch. If continuity is as specified, inspect harness and connectors between door unlock detection switch and ATS ECU. See TESTING ANTI-THEFT CIRCUITS .
NO RELATED
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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.