Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hi, How are you?I'm Shabaz, one of the automotive experts, I'm sorry you're experiencing problems with your car, I will do my best to help you today.
Firstly, what is the issue with the multimedia system? This could well be the cause of the battery drain issue.
Sorry I am unable to take calls at the moment.
Have you tried to hard reset the multimedia system by pulling the fuse?
Fuse number 25 in the fusebox located in the boot is for the multimedia unit. Switch the car off, pull the fuse, turn the ignition on to verify that there is no power. Leave it for about 5 minutes and refit the fuse.
If you have a diagram on the inside of the the fusebox cover or in your manual, I would recommend referring to that, you're looking for COMMAND operating, display and control unit.
Let me know the results and I will also explain how the battery drain problem needs to be checked.
I am in the north of england. I actually work for a dealer and not my own garage. I would recommend finding an independant garage who focuses on diagnostics because your car needs to undergo a parasitic drain test as well as troubleshoot the multimedia system.
The logo turning on and off means that there is a problem with a component on the multimedia system which is connected via fibre optics. When the MB logo comes up, the head unit is doing a system check and if there is something wrong, the head unit turns off.
You can buy a fibre optic loop which you use to bypass each component connected via fibre optics; cd changer, navigation, voice control module etc.
The fibre optic cable is a twin orange cable that plugs into each component (it's easily visible), you unplug this, connect the loop and switch screen on to see if it boots up, you do this process for each component until the head unit loads up.
I hope you understand what I mean.
This image shows a simple male and female plug fibre optic loop.