Stock OEM Comand System in my 2005 SL 600
I have no audio , no radio, no cd player, no GPS, just this error message every time I turn on the comand unit then it powers itself off. When I connect my DAS system to the car the only Fault code states there's a problem in the Audio Gateway system? Is there away to isolate the AGW module itself to see if that's the issue or could it be something else in this audio loop like the comand, teleaid, Bose Amp, AGW, phone cradle hookup in the center armrest, Need help.
Thank you All

 

Found this video today. I wouldn’t disconnect all the fiber optic connections at once like this guy did but the testing is sound.
It sounds like you may have a failed component and by bypassing each one you can narrow down which one.