94 E320A Radio Problem - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 04-10-2008, 06:29 PM Thread Starter
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Date registered: Sep 2006
Vehicle: 1994 MB E320 Convertible
Location: Kennebunkport, Maine
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94 E320A Radio Problem

There is a problem getting my radio working after the car was stored for the winter and the battery had run down. I have the code an radio manual and know how to re-enter the code but this time when I did it, the radio came on for an instant and then shut down and the word PHONE appeared on the radio display. My mechanic has tied also with the same result and does not have any idea what is going on. All fuses have been checked and are good. There is an old car phone in the armrest, but it does not work and there is no information about the radio in the phone manual or about the phone in the radio manual - no mention of the PHONE code being displayed. I have checked with two MB dealers by phone and none of their techs have any ideas - of course one dealer suggested a new radio. Can anyone help?
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post #2 of 2 (permalink) Old 04-10-2008, 10:10 PM
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Date registered: Dec 2005
Vehicle: 222.132 & 221.122 & 212.025 & 906.633
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The phone kit is faulty or a short circuit to ground on the mute line. Try disconnecting the mute line from the rear of the radio first. If it works, then you can try to follow the mute line to figure out who is pulling it down.
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