Depending on the year of your ML, there are two types of CD players. The changer in the back of the vehicle or the single CD player, part of the stereo.
Rear mounted CD changer, disconnect power for several minutes, this can act as a reset and bring the changer back to working.
Dash mounted CD player, may have Nav too. Again, depending on the year of the vehicle, there are some players that require some modifications at the repair level. Bosch, one of the manufacturers to be specific, for these units.
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Check the manual for the security code for your vehicle. I'm pretty sure it's a 5 digit code. If you locate it, enter the code into your stereo. You may have to take it to a Mercedes dealer if you cannot find it. If you do have to take it to the dealer, pull the radio out and get the serial number from the side of the radio, the service tech will charge you big bucks if you make him do it. I hope this helps =)
If you e-mail any Mercedes Benz dealership your car registration, VIN, and/or driver's license, a service manager will lookup the radio code for the model of your car. Once you get the code, I would keep it in a safe place.
If there is no scratches on it and the label isn't worn off it should play. Some older CDs had microscopic lithium ion batteries imbedded in them. You should check with the Mercedes dealer and see if they still carry the batteries and if they are replaceable. If that doesn't work I would smash it with a hammer.
does your radio ask for the code when you turn on the ignition key. If you see _ _ _ _ or **** you should enter the code using the pre set numbers for your radio, ie, first code should be entered using the first pre set key on the radio ( number one ).
Followed by the second code number being entered using the second pre set button and so on until all of the code is entered.
After entering the full code the radio should accept, if not enter code again and press the next pre set key following, ie, if the code is 4 digits, press the fifth.
Hope this works.
If all this fails most garages will set the security code for you for a small charge. Make sure you take proof of car ownership otherwise they will normally refuse to reset the code. This is to foil theft.