Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
I am sorry that you have not been helped yet. I just came online and saw your question
Most likely this is a faulty SAM module and will require diagnosis and confirmation with a MB STAR scan tool, but if you can provide the vin number I will pull the schematics and see if there is any testing without a MB STAR scan tool.
Ok, I went thru the testing procedures and unfortunately they all require a Star scan tool, no work arounds. backprobing the SAM unit will definitely fry it and other modules as well
Are all of the door locks inoperative or just the driver's side?
Ok, the locks are controlled by a completely separate pump module so that is a separate problem. There is a fuse for the central locking pump under the passenger rear seat bench. You have to remove the plastic floor light cover in order to access the fuse box. Fuse 62 (yellow 20 amp) is the one you need to check. It is common for the pump to burn up or seize.
As for the driver's window and seat, there is a driver's side door control module that commonly fails which will take out all functions of the door (except locks) and seat controls.
The sunroof is not controlled by any of these control units either. It would be beneficial to have a quick test done with a Mercedes star or a Snap-on scanner to check all fault codes. There may be a faulty overhead control panel which controls the sunroof or a just a bad sunroof motor.
Have you checked to see if the door locks start working when the all the window and seat controls start working? Does everything start working at the same time?
They all start working at the same time?
It sounds like an interior network problem. I think the best option would be to get a quick test done by a mercedes star diagnostic tool. If you get the results, you can post them here and I can tell you which parts need to be replaced. I don't want to blindly have you replace parts that could be causing the problem.
You can't buy the Mercedes scan tool but you can buy a knock off that will work just as well.
This will work well but you need your own laptop with a serial port. http://www.ebay.com/itm/Mercedes-Benz-MB-STAR-C3-Mercedes-Benz-Diagnosis-Tool-with-V07-2015-D630-HDD-/281811814393