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.
Trunk Lid Courtesy Switch Circuits
Turn ignition off and disconnect ATS ECU connector. Open trunk lid and close all other doors and engine hood. Ensure continuity exists between ground and terminal B10 (with power door locks, Red/White wire) or No. 13 (without power door locks, Red/White wire). If continuity is not present, repair open in harness or connectors as necessary. If continuity is present in all courtesy switch circuits as specified, replace ATS ECU and retest.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.