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.Voice Input Control Unit SVS – In the trunk, left side.SPS Speech Module – Located in the trunk, left side.Bluetooth Phone Module – In the trunk, left side.Satellite DLP Module – In the trunk, left side.Amplifier Logic 7 – In the trunk, left.CD Changer – Integrated with the CIC/CCC or in the glovebox.CIC / CCC – Located in the dashboard, below the climate control.You may have anywhere from three up to eight components. Your BMW will have a few of these, depending on the options that came with your car. This is a list of components that can be part of the BMW MOST network.
Reduction in the number of cables needed.Multiple devices, such as the amplifier, telephone, satellite tuner, iPod interface, Bluetooth hands-free module, etc., are connected to MOST networks. The BMW audio components are configured in a loop, so if one fails, everything stops working. MOST, for Media Oriented Systems Transport, can connect up to 64 bus systems in BMW vehicles in a ring configuration.
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