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.
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HOMESERVICE MANUALSMERCEDES BENZ1993400EREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSANTI-THEFT SYSTEMTESTINGTRUNK SWITCH CIRCUIT CHECK
1993 Mercedes Benz 400E
Trunk Switch Circuit Check
1993 Mercedes Benz 400ESECTION Trunk Switch Circuit Check
- Ensure doors are closed. Disconnect anti-theft control module 14-pin wiring harness connector. Anti-theft control module is located in right footwell below foot support. See Figure . Ensure wiring harness connector terminals are clean and tight.
- Connect voltmeter negative lead to terminal No. 10 (Black wire). Connect positive lead to connector terminal No. 3 (Red/White wire). If 11 volts or more are present, circuit is okay and testing is complete. If less than 11 volts are present, repair circuit as necessary.
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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.