This is a easy one, your seat control modules are draining your battery everyday! As long as you do have power seats correct? They stay awake and keep your c.a.n. bus awake which pulls about 1.5 amps or so until your battery is dead. These are not cheap control modules, but the only way to repair this is to replace them, and even though only one of the control modules is causing the drain, they both need to be replaced at the same time, or you will have more problems. Not to bad if you want to do it yourself, they are located under each seat and clip to the seat track. Just need to raise the seat and unplug them and install the new ones. Hope that helps!
Something is on draining your battery overnight. Any light or any relay. It can also be your battery has a dead cell draining it overnight.
try disconnecting the battery
Defective alternator, dead cell in battery, stuck relay, or something is on pulling power from the battery. Any light that is on such as under-hood, trunk, glove box, dome, etc.
Then either something is on draining the battery or the battery has a dead cell draining all the rest and must be replaced.
A short will not drain the battery it will blow a fuse. It may be the battery has a dead cell, or some light is on draining the battery. It can also be a stuck relay.
All Mercedes have battery in the trunk
I have the same problem with my 2002 C320. After diagnosing the problem at the MB dealership, I was told that the power seat motor is draining my battery. Both seats. Come to find out that many other people have experienced the same problem.I called Mercedes USA and they said that since the car is out of warranty, there is not much they can do. But if enough people call and tell them that they have this same problem, they will realize that this is a defective part and they will issue a recall and pay for necessary repairs.Please call Mercedes USA and report this problem. 1-800-FOR-MERCEDES (1-800-367-6372) or 201-476-6200
How do you remove the seat to replace the battery on the mercedes r350 2006
Take off the negative battery cable and hook a test light in between the cable and the battery post. If you have a drain, the light will be on. Start pulling fuses until the light goes off and when it does go off, that is the thing that is draining the battery. If no fuses affect it, take the altermator wires off. If the light goes off then, the alt is bad,.
There is a circuit live somewhere.
The battery is in the boot
The battery is located in the trunk.