Question about Mercedes-Benz ML320

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2002 ML320 No Sound..PLEASE HELP!

I recently bought a 2002 ML320. I am having problems with the audio. The CD player does not see the CD cartridge, it displays "No CDs inserted"; I see the radio stations on the LCD display but I am not hearing a single sound out from the speakers? What should I do?? I can't afford the MB dealership they are charging arm and a leg just to check it.......

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  • westervelt27 Mar 05, 2009

    Thanks svienneau.... I pulled out the fuse F10 and F21....... It asked me to enter the code which I did....but still no sound. I then went further by pulling the negative terminal on the battery and entered the code again and still not getting any sound. The cd player accepts the magazine but its not seen on the LCD display.....its still asking for CD to be inserted......

    Please send more ideas


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I install car audio for a living, and see this problem in ml320's all the time. There is no good fix for it. Every time one of my customers goes to the dealership, they tell them they need to replace the system. You can buy a very nice aftermarket indash with navigation, moblile video, bluetooth, and Ipod controller for 1/5 of what Mercedes will charge. The wires you need for power are behind the radio, a standard VW adaptor harness will work, just make sure to reverse the constant and switched power wires in the harness(red and yellow). You can catch all the speaker wires at the factory amp.

The amp is under the drivers side dash. I have seen post that place it above the gas pedal, but the ones I have bypassed are to the left of the steering column. It is way up there, and not in plain site. It is all the way up, in the corner against the firewall2002 ML320 No Sound..PLEASE HELP! - 2.gif. If you pull back the black sound proof material, you will see it. It looks like an aftermarket amp. It is held in with one 10mm bolt at the bottom. The speaker wires are twisted. The ones I did used the same colors for left and right, so use a tone generator, or small battery to find left and right, front and rear. On the ones I worked on, the pinks and blues were the positives. Hope this helps.

Posted on Aug 17, 2009

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Try pulling the fuse and it might reset the unit,also if there is a code to the system it may need this if someone was pulling fuses before you bought the vehicle you might need the code. or just pull the stock system out and get an after market system for what you would pay the MB dealer to trouble shoot it .let me know how it turns out

Posted on Mar 05, 2009

  • svienneau Mar 05, 2009

    This might sound crazy,But look for any fuses on the speakers or wires to the speakers, also see if there is an AMP somewhere in the vehicle like the trunk or under a seat??,thete will be a fuse on the amp if thete is one .


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