Circuit Check
- Disconnect anti-theft control module 14-pin wiring harness connector. Anti-theft control module is located in right footwell below foot support. See Fig 1
. Ensure wiring harness connector terminals are clean and tight. Connect voltmeter positive lead to connector terminal No. "3" (Red wire) and negative lead to terminal No. "2" (Brown wire).
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
- If 11 volts or more are present, go to next step. If less than 11 volts are present, repair Red wire between terminal No. "3" and fuse No. 12 or Brown wire between terminal No. "2" and ground.
- Disconnect anti-theft control module 8-pin wiring harness connector. Ensure that wiring harness connector terminals are clean and tight. Connect voltmeter negative lead to 14-pin connector terminal No. "2" (Brown wire). Alternately connect voltmeter positive lead to 8-pin connector terminal No. 4 (Red/White wire) and No. "5" (Red wire). If 11 volts or more are present, circuit is okay and testing is complete. If less than 11 volts are not present, go to next step.
- Check Red/White wire between terminal No. "4" and input side of auxiliary fuse box for continuity. Check Red wire between terminal No. "5" and input side of auxiliary fuse box for continuity. If continuity is present, circuit is okay. If continuity is not present, repair open circuit.