Stuck on the road again!
Member
Joined: Jan 2012
Posts: 244
Likes: 4
From: PA, USA
2004 E320 4matic Sedan
How do you replace the BCM?
(I know what it is.) Do you simply disconnect the wires in any order that's convenient, remove and replace, or do you need to de-energize the car first by disconnecting both batteries?
I'm glad you made it home. It read like quite an odyssey!
Senior Member
Joined: Mar 2010
Posts: 451
Likes: 44
2007 E350; 2018 GLE350
Glad you got it fixed. I am going to school on you on this thread. I'll be alert to possible BCM failures on wife's 211. Good luck, Mate, and thanks for the info.
Thread Starter
MBWorld Fanatic!
Joined: Mar 2006
Posts: 3,254
Likes: 15
From: Louisiana
03 E500 and Corvette
One lead to the BCM is the negative lead from the battery. When you disconnect this the battery is disconnected. There is a lock down tab on the plug. You MUST raise the lock down tab on the plug to remove the plug. Total time to replace the BCM is about 5 minutes.
