Thank you very much for your purchase from etrailer of the Towing Kit w/ Ball Mount and Trailer Wiring for Stealth Hitches Hidden Rack Receiver # 391CONVA7 as we are always happy to try and help our customers. For this issue with your BMW, there are a number of issues that could be occurring, and you mentioned testing, and it sounds like you have already tested the power wire from the battery into the module.
Assuming you have and it is indeed receiving power, use Circuit Tester # PTW2979... view full answer...
It sounds like the shock is worn out in your coupler and it is no longer functioning as a dampener to allow the coupler to return slowly and that is the clanking sound you are hearing.
I attached a page that shows all of the different actuator shocks like # T2336200 that we offer. If you email me back with what model actuator you have I can help you pick one out. view full answer...
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