Quote:
Originally Posted by Father Of Giants
This sounds most likely like a communication issue, because both are out at the same time.
Or simply a bad brake light switch?
Or bad brake light assembly contacts? Read Dspicher's post, very interesting.
https://forums.edmunds.com/discussion/5796/mercedes-benz/r-class/mercedes-benz-r-class-electrical-problems
Does the IcarSoft MB really say "Open or Short" if so.
If it where a true open you'd have 12v at the beginning of the brake light circuit, but 0v at the bulb.
If where a true full short to ground it would read 0v at the source (where the circuit begins) and 0v at the load.
That's all I can think of. |
I thought about the brake light switch being the problem, but since the tail light and brake light are the same bulb, the tail light would/should work even if the brake doesn't. These single filament bulbs are connected to a module that puts a lower voltage for the tail light, and higher voltage for the brake. I believe all MB's since 2003 are like this. I fear it may have a bad SAM as EDBSO described. If there is a separate module for the rear lights, it may be easier/cheaper to fix. However, if the rear light control is in the rear SAM, then it could get expensive. These cars have separate modules for each door, the overhead, and tailgate. I need to do more research and find out if the lights are controlled by a module, or the SAM.......Rich