1 check in vehicle to see which software version you are running. (somewhere in settings)
2. Call Mercedes to see if there are updates available and if so where to get them.
3. Update.
If still not working
4. Get a multimeter.
5. Start checking rear inputs on stereo to see if anything is not powered or has a low signal.
6. If it does follow to next point and test till you see what the source of the issue is.
7. If does not you just have to follow every wire back and keep testing at eacu connection point till you find the issue.
Sucks but that is why this type of issue costs so much to fix. It takes time and patience.
Good luck. You can also ask Mercedes while on the phone for step 2 to see if they will provide a wiring chart for the radio in the vehicle. Google is also your friend and be prepared to have 700 tabs open for this issue. I will say though once you find the issue and get it fixed it one of the most rewarding feelings on this planet.
1 check in vehicle to see which software version you are running. (somewhere in settings) 2. Call Mercedes to see if there are updates available and if so where to get them. 3. Update.
If still not working 4. Get a multimeter. 5. Start checking rear inputs on stereo to see if anything is not powered or has a low signal. 6. If it does follow to next point and test till you see what the source of the issue is. 7. If does not you just have to follow every wire back and keep testing at eacu connection point till you find the issue.
Sucks but that is why this type of issue costs so much to fix. It takes time and patience.
Good luck. You can also ask Mercedes while on the phone for step 2 to see if they will provide a wiring chart for the radio in the vehicle. Google is also your friend and be prepared to have 700 tabs open for this issue. I will say though once you find the issue and get it fixed it one of the most rewarding feelings on this planet.