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Kenny, BMW Technician
Category: BMW
Satisfied Customers: 1053
Experience:  BMW Master Certifed level 1 Technican
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BMW assist malfunction. No phone or radio, It came with car.

Customer Question

BMW assist malfunction . No phone or radio
JA: Is this an aftermarket stereo, or did it come with the car?
Customer: It came with car.
JA: What is the model/year of your BMW?
Customer: 2006 750li
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes . Nothing
JA: Anything else you think the mechanic should know?
Customer: No
Submitted: 2 months ago.
Category: BMW
Expert:  Kenny replied 2 months ago.

On your vehicle there is a fiber optic bus for all of your entertainment system, If this bus goes down you will have all of symptoms you are complaining about. Warning lights on and no sound. There could be several reasons for this a failed control unit to a broken wire. It will take a BMW diagnostic tool to determine what module or wire has failed. My best guess is the amplifier module is the cause they are a common failure on your 750i as for replacement it will need to be done at the dealer because it needs to be programmed to your vehicle for it to work.

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