Hi folks! havent posted here in a long time, my e55 is having some issues that I just cant figure out.
last year I blew my radiator, snapped my steering rack and had 2 bad wheel bearings and at the time just didnt have time nor could afford to fix it so I parked it for the better part of the year.
when I finally got around to fixing it everything was going fine. Replaced the wheel bearings, took it out for a drive and all was well. I left for work for 2 weeks; when I got back I went to go do the Steering rack...this is where all the problems started. When it was on the lift I noticed the rear right tail light was flickering, headlights werent working, some interior lights didnt work and Radio wouldnt turn on. After scanning the car I came to the conclusion that my REAR SAM took a crap. I swapped out the whole unit with a used one that shared the same partnumber as mine. This fixed everything except my radio.
So as of the last couple weeks I have been trying to track down why my radio will turn on, shows the logo and then shuts off instantly.
things I have tried:
1. replacing all blown fuses (engine bay, drivers side door, and rear sam)
2. MOST fiber loop on cd changer and navigation

Now the only thing I am unsure of is the SAM module, when it is replaced will it cause issues with a radio not working? I dont want to spent the money to have it programmed to my car if its not going to solve anything.
I am very new to all this diagnostic work, I can replace parts and service the car as I have done the last five years but this is all new so any and all help is welcome

Thanks!

 

FWIW next step need to have someone check for fault codes and transfer / code data specific to your vehicle before moving to replacing parts.