![]() The telematics unit and the speed module located in the trunk are often the culprits.Ī common problem is cracking, usually from the front speakers. When you bypass the defective module, you will get sound from your BMW speakers. To find out which module is defective, you can use a female fiber optic loop (also called a lollipop) and bypass all the modules one at a time. Even though all the modules function and seem to work properly, one of the modules listed above is defective or not turning on. This problem is caused when the optical loop is broken. Possible problems that can trigger fault codes in the MOST module. iDrive keep switching to the home screen.Crackling From Speakers could be an issue SVS or TCU module.Malfunction message on the iDrive screen.Here are a few symptoms you may notice if one of the MOST components fails. Headset interface – Located left side of the trunk.Antenna tuner or digital tuner – Located on the left side of the trunk or behind the rear seat.TCU telematics control unit – In the trunk, left side.ASk Head unit – Head unit in the dashboard. ![]()
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