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.
Alarm Does Not Trip With Trunk Knockout Switch
Turn ignition off. Disconnect Body Control Module (BCM) connector C4. Disconnect trunk knockout switch connector. Connect a 12-volt test light between battery voltage and BCM C4 connector terminal No. 8, deck lid security switch sense circuit (Violet/White wire). If test light illuminates, repair short to ground in Violet/White wire. If test light does not illuminate, replace BCM.
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.