Originally Posted by
Ronman
I thought originally the replacement BCM solved your problems? Did the manual control of spoiler, traction control or tow alarm work with the original BCM?
It should be possible to find a replacement BCM that matches your original one either on eBay or at car-part.com Luckily used ones are not that expensive.
There must be other companies that can repair the BCM if you want to go that route. I am sure on the Mercedes forum there are more posts than on here.
You can try disconnecting the battery for 30 minutes. Then reconnect it and put the key in accessory mode right before it turns on and leave it like that for a minute or two to see if the replacement used BCM will sync with the car like I've seen in a previous post.
The replacement BCM resolved The most important issues (turn signals, wipers, door lock/unlock).
The manual spoiler control worked with the original BCM until it died. I cannot absolutely say that the manual switches for traction control and the tow alarm worked with the original BCM. I don't believe that I ever used those switches.
I found on eBay another BCM with the same hardware version and software version. I have ordered it and will post the results.
If I can have working lights, wipers, rear defroster, turn signals, rear spoiler(manual and speed deploy) locking/unlocking doors (manual and remotely) I can be happy.