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.
61 35 502 Replacing the trailer module (09/2006-03/2009)
Special tools required:
Plug connectors and associated pin assignments must be adapted if the old plug connector AHM3(+) is fitted.
- plug connector, new AHM4
- Previous plug connector AHM3 (+)
Necessary preliminary tasks
- Remove TRAILER MODULE
From build date/version 03/2007 Series E60/61:
Installation note:
Cut out equipment holder up to mark (1).
Cut out indentation in area (2).
Make sure AHM module is exactly seated and wiring harness is correctly routed.
NO RELATED
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.