Mercedes ML320 CD Changer Malfunction

Hi,just food for thought,if its saying no cd could it be the connection from the cd changer to the back of the cd player,hope you get it sorted all the best.

2007 mercede ml320 wiring diagram ecu&body control

I dont remember if that year had a theft lock system or not, but I am looking into it. disconnect the negative battery cable for ten minutes and that should get you back to where you can enter the unlock code again and use the radio.

Hi Anthony,

Believe it or not, this is a very common issue in most of these model, I personally own an 2000 S500 myself and I have this problem too, I already checked with others who with the same model car and they have also experienced this issue. Here is what worked for me and others that have taken the same steps I'm about to layout to you... You can do this yourself or you can pay someone to do it for you, It may cost you approximately 100 bucks. If you decide to do it yourself you may have to consider some special tools to remove Radio, Dashboard or CD Changer whichever you may need to repair, level of difficulty is about 6 - This also depends on your ability to work on such projects...
Most of the time, the reason why the audio system device stops is because your CD Changer has seen better days,... As matter of fact, Models such as S500 2000 - 2006 had a recall regarding the static charges in the truck causing audio system failure on CD Changer and other electrical components. However we all know that, Mercedes Benz Engineers have seen us coming...Trust me! Isn't it interesting how the car start to decompose right before our eyes and electrical components starts to go immediately after the warranty runs out or right after you finished making your last payment. ;-) Anyway... remove the rear CD Changer located in the Trunk on the rear left corner of your car right below the rear tail light, remove the carpet, then remove the silver metal thin cover plate exposing the entire CD Changer, locate the screws the holds the CD Changer in place... This is the hardest part I don't know where they're on your vehicle, but be patient... you may need a small mirror attached to a stick, a flash light, gloves, a special screw driver for Benz, Search for a Video on you tube on how to remove the sound system on a s500 and you will see what I mean! Once you remove your CD Changer, you will need to connect a wire back to where the CD Changer was plugged into, and your radio should start working after that! Just to be safe I would disconnect the battery cables to avoid damage to your system... Hope I was able to help you get your awesome sound system loud again... Good Luck!

I am having the same problem with my CD changer in a 2004 Suburban. Have you found a solution yet? Chevy dealership told me that I would have to replace the radio.

All radio accesories are on what is called a d2b ring. This ring consists of your c.d. player,telephone t.r.u. and voice activation module. On some vehicles the factory amplifier and tele aide modules are on this loop. If you have aphone see if it works. I do not think your amp is part of this ring although benz started incorporating the amp. in 2000 model years. The way this system works is that the head unit sends a wake up signal and verifies that these components work. Each components is in series and the last one in the loop sends the signal back to the head unit. It is easy to determine if you have a problem in your d2b ring if none of these components work. Although the head unit reads no changer I would make sure all of the c.d.s are installed correctly. You can also try and remove the unit and there should be areset button you can push in with a ball point pen at the base of the unit.

Hi, The cd changer is at fault. You need to replace the cd changer. This ia very common on these vehicles.

IT SHOULD BE IN GLOCK BOX

i have a 2000 kompressor .106,000 miles i have the 3rd changer in it .you can get on ebay for $250.00 ,get 6 while you are at it you wiil need them ,they only last about 6 months.Dealer said it was because of burnt cds ??

Service time for that head unit. Get it out and to a repair shop as the laser assembly needs work...accordianman