This guy is a phenomenal resource. So is it possible the bad light switch is corrupting other signal on the upper panel control unit? That would explain all of the other gremlins in the dash he's experiencing. Or is it likely the control unit itself is shot?

 

I understand dealer diagnosed malfunction using DAS, faulty CAN device - light switch.

 

Yeah….. I broke a couple of my own rules when buying the car. I was in a rush, and most importantly I didn’t do a PPI. I went with an incredibly clean Carfax and low miles. That swayed me.

I’m sure that the electrical issues will ultimately resolve themselves in the near future. It is strange though getting conflicting diagnosis from 2 different dealers ……..one saying it’s the headlight switch (221 545 1404) and the other indicating it’s the climate control (221 905 5200). I would have thought that the computer reads would be able to pinpoint a problem like this. I could see by making the wrong decision, I could certainly end up in a hole. I have already purchased a part….Dash Control Panel (2218701758) and that proved not to be the problem. I am thankful to find a Forum like this with such knowledgeable contributors.

 

Damn thats a lot of issues.

I installed the amp and took it back to Benz as the radio still isn't working. They said there is good new and bad news. Good news is the code for the amp is gone. Bad news is that the HD Sirus radio module is gone and is still causing the issue with the radio. $1880 CAD for a new one!!!! I can't find my part number on EBay. 171-906-35-00

 

Search 1719063500 i.e.:


http://mbiparts.com/buy-used/2010-Me...063500/34022-1

 

I think they can bypass that XM module (basically a little plastic coupler that buts the two ends of the fiber optic cable together so the ring remains closed), and then they may need to recode COMAND so that it's no longer polling that module when it boots up. Unless you really love satellite radio.

Hey, no chance this was ever a flood car?

 

They tried bypassing it and the radio, bluetooth, GPS, and media player didn't work. They only thing that worked was the CD for some reason.

 

Interesting. The CD changer is in the COMAND unit itself, whereas the other bits are peripherals, but the fact the CD player works means the amp is working. Something is breaking the fiber optic loop.

 

Yeah, the amp was replaced now they are saying its the HD Satellite radio receiver. The code for the amp is gone now that its replaced. I should have opted for the bang and oulfsen system

 

This strange electrical saga continues. My mechanic(s) have suggested it might be a SAM unit (2215409245). Coming out of Porsches, and going into this car, I am amazed at all the electrical issues that can exist with a Mercedes that cannot be simply diagnosed. So far I have had 2 Mercedes dealers input, and one Indy giving expert opinions.

 

It's very unusual. The cars are generally good about reporting problem components with accuracy. That's why I asked if the car had a clean title vs salvage or flood. Too much stuff all at once.

 

Very clean Carfax……. 2 previous owners, both on the island of Oahu in Hawaii. They drove it around in circles for 39000 miles. The car was then shipped to L.A. where I bought it. Maybe the humidity???

 

Seems something else has to get hosed for this issue to originate from the light switch.

 

this is a known issue with the W221. The xm sirus radio module is known to be defective and must be replaced.

 

For what it’s worth……..when I originally started this thread……. I was trying to nail down an electrical problem that plagued everything in the car. Clock, night vision, lights, and controls for the display screen. The problem is now solved, and it was the “center climate control” 221 870 26 58. So I am now a happy Man.