Question about 2007 Mercedes-Benz C230 Sedan

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Ignition off radio works, ignition on radio mutes

When ignition is off radio works but when ignition is on the radio mutes and mute button doesn't work

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I would also check the mute or volume buttons on the steering wheel. spray them with a can of compressed air, hold the volume up and spray the minus and vise versa. hope this helps.

Posted on Mar 31, 2014

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Posted on Jan 02, 2017

  • 43 Answers

SOURCE: radio audio muted and cd changer gives message no cd changer c320

Hi, Joe here to help. The cd changer is at fault. You need to replace the changer. The system is on a fiber optic loop which cuts out the sound if can not complete that loop.

Posted on Apr 08, 2009

  • 580 Answers

SOURCE: Radio muted

See if your car is equipped with hands free cell phone interface it may have been activated accidentally

Posted on Jul 09, 2009

jasperoni
  • 203 Answers

SOURCE: my stereo says 'muted' and does not work except when in reverse

They have a speed dependent volume so it does have wheel speed sensor input which could cause the wierd reverse only operation. It sounds like a software problem-I would try version coding the head unit(which will have to be done if you have a c.d. player or telephone in the car. Try to unmute it from the steering wheel buttons it may think there is a phone in the car and is muting the radio for phone operation. Your best bet is to pull codes and version code with a s.d.s. machine or at least a hand held tester but the majority of after market scan tools will not communicate with the d2b system which is your radio or sound system. good luck I hope I have been helpful

Posted on Sep 16, 2009

  • 869 Answers

SOURCE: 2009 s 550 4 magic.

take it to a dealer and get the stereo scanned properly for wrong internal wiring

Posted on Apr 18, 2011

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Margaret, this is free public forum , demands don't play here (free)
and you double posted. why do that.? if you wish to elaborate
try posting below 1st post, as an add.
and for better help? why not post to a BMW forum. (faster)
and no car year, posted or car options listed.

Radio year, model and Car Cell phone options.

no matter.......
the first check on all electronics, is the fuse
most radios have 3 power sources, (to make all features work)
and fuses are on all 3.
have you tried all sources, AM/FM CD, MP3 USB (if opted) .
are all modes dead?
the next check is to try all buttons on the radio. ?
is there a mute button? if car has 4 speaker try the fader lever.
front to rear. left to right , still dead.?
cycle modes. radio, cassette, CD 6 pack , what ever, but do cycle them all as older cars the mode switch can stick.

The RDS is radio station text messages. for song titles.
including time, station identification and programme information.
if this part really works, the RDS part this means the radio is working, but the power amp is dead or muted.
try balance and fader.
many radios (1000s) have fuses in the radio for the speaker amp
that can blow. (shorted speaker wires a prime reason)
or some have in line fuse. and others are in the cars fuse box
which varies by maker or model year.

ok , im looking at the stock radio on level C stock 1991 radio
and even back when (stock to me) the is RADIO muting
so if your car has Cell phone muting bingo that.
and a fuse at rear of radio, (unstated purpose)
guessing,id say there is lamp that glows, CELL mute?


conclusion, no car year stated, or year radio of not origional.

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