Many BMW 5 and 6 Series have what is called Micro Power Module (MPM) which is used to power the iDrive, Radio, Navigation and the LCD screen on the dashboard. BMW MPM module can fail to cause the following symptoms.
BMW MPM module is responsible for your entertainment, communication and navigation system. It is responsible for turning ON/OFF your electrical systems and putting them to sleep. Because BMW decided to install it in the trunk, it is a common problem where the MPM module gets wet and shorts out.
When MPM module is damaged your display screen, door chime, and radio will stop working.
iDrive will not start
Battery drain when car is parked
CCC will not power up
DVD slots lights (only) turn
No chime when you open the door
Navigation screen does not turn on
Failure of Audio System and Body Control devices
Unfortuanlty BMW installed this module in the trunk of the vehicle below the spare tire. If water or any fluids leak in your trunk, it will end up at the bottom of the spare tire well where the MPM module is located.
Fluids can easily enter the MPM box causing your BMW radio to shut down and never turn on again.
To fix this problem you will need to replace the MPM module. In our case, we tried to dry the module but it still didn't work. Replacing the module is very simple. Unplug the old BMW MPM module and plug in the new one. It does not need any programming.