Expert Benz owner Needed - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 05-07-2010, 03:36 PM Thread Starter
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Question Expert Benz owner Needed

I have a unique problem here and have been doing alot of research and need a expert figure this out for me.


C230 Kompressor, year 2003.

Currently, my radio doesn't not work. When the car is on the radio will not turn on unless I press the volume button on/off manually. When I do turn it on manually only a few decibels of sound will come out of the speakers then usually fade out to nothing (almost sounds like a blown speaker but it's not blown).

Second, I have a CD changer but it doesn't recognize the CD changer in my glove box. However, the CD changer still has power and will eject the CD changer whenever I press eject.

Also the lights on the head unit will not light up (for example the phone pad 1-9, 0) usually lights up in orange at night so you can use it.

I checked the fuses. Nothing blown.

Also the steering wheelvolume control doesn't work anymore.

It seems everything is slowly starting to short out and not work. I have no clue what the problem is.

Can anyone help? Last thing I want to do is take this to a dealer and grab my ankles after the bill.

Any help I would greatly appreciate. Thanks guys.

Clint-
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post #2 of 8 (permalink) Old 05-07-2010, 04:14 PM
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Sell the rolling money pit now while you are still ahead. It only gets worse from here. These cars were low quality, unreliable and repair prone. You are getting to see what I mean first hand.
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post #3 of 8 (permalink) Old 05-07-2010, 04:24 PM Thread Starter
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I totally agree with you, but I can't sell this thing when the radio/cd player doesn't work. I'd like to fix it before I sell the POS
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post #4 of 8 (permalink) Old 05-07-2010, 09:01 PM
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Get a used radio off ebay or from someone breaking a C class and swap yours out. Your head unit is about dead.
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post #5 of 8 (permalink) Old 05-08-2010, 06:51 PM
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sounds like you need a new radio, new cd changer and new steering wheel buttons.
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post #6 of 8 (permalink) Old 05-08-2010, 11:49 PM
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On a 2003 MB the radio is controlled via CAN-bus messages. Radio and related units have continuous power, the main unit gets ignition on (or off) signal from the CAN bus and turns on and off accordingly. Other devices on the fibre ring turn on from the wake up signal from the main unit.

Also steering wheel buttons are read via CAN bus equally as the info about lights. It looks obvious that your head unit does not have the CAN bus signal connected, either the plug from the rear is loose or something else. Or you need to reset the head unit.

The audio behaviour however sounds odd. A bit like a short circuit somewhere making the amp power down to protect itself.

Do you have a separate Bose/Sound System audio amplifier in the car?
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post #7 of 8 (permalink) Old 05-09-2010, 07:23 AM
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Two experts have expressed differing opinions, but I'm leaning with DB. I would have someone hook it up to a Star system and see if it's a problem with the fiber optic loop. I had some similar strange goings on and that was the solution.

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post #8 of 8 (permalink) Old 05-09-2010, 07:38 AM
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Originally Posted by Musikmann View Post
Two experts have expressed differing opinions, but I'm leaning with DB. I would have someone hook it up to a Star system and see if it's a problem with the fiber optic loop. I had some similar strange goings on and that was the solution.
Best call yet

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