W211 E240 radio won't work
 

2003 W211 E240 Radio won't work!
Hi, can anyone help me or has anyone had this problem!
When I turn on radio/cassette player A211 820 08 79, all I get is six dashs on screen (------) which turn off after a minute, it is also connected to a cd changer and a phone.
I have tried replaced the radio with exact same model, but have the same result.
After reading other threads, I see that maybe a coupler can be used to bypass the cd unit which I suspect is the problem.If so what is the part number for the coupler ?
Or will I have to get new software upgrade for the audio gateway and head unit ?
I am a newbee from Ireland and would like to thank anyone who can solve this problem.

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