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I recently purchased a 2012 528i. Was working fine then electrical things started failing. Charger ports, bluetooth, aux input, stop-start, etc. Next morning I got an excessive battery depletion warning. It went away before I could really remember what it said. I took it to the dealership where I bought it (not BMW). They said I needed a new battery.

With new battery, everything went back to normal except the bluetooth and aux input. The mechanic showed me the diagnostic computer showing everything was just perfect. He doesn't know how to fix it. Before I pay BMW, anyone have any ideas for the other dealer who won't charge me?
 
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