A trip to a Mercedes dealer with your log book and proof of i.d and provided the stereo is the origional factory fit then they should be able to track down the code and instal it for a minimal fee.I needed a new key for my c36 amg,gave them the info from the log book and an origional pre programed key arrived 4 days later from germany.
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Re: Lost ML320 Audio System Security Code
You need to notify dealer they will be the only one who has un-loc code for radios the loc mode is part of ur security system only problem when working or with a dead battery puts the radio system in loc mode and if u dont have code u need to notify dealer also if u put in a wrong code to many times-- vehicle would have to be brought in to be reset by the dealer
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you will need to enter a code to get the radio to work again. if the code is not in the owners manual, you will probably need to call a dealership to get the code. you will probably need the vin number of the car.
a dealer should be able to give you the code if you get the serial number from the radio, also are you sure the code is not in with your car books, service manuals and book packs, often it is in there o a small credit sized card. alternatively some radio decoders will come to you at home, they charge about £25 in the UK to recode the radio.
Locate the manuals you received when you purchased the car. On the inside cover (front or back) of one of them, the dealer should have pasted a white rectangular sticker with black print identifying the code for the radio. In my case, it was pasted on the inside back cover of the Owners Manual. The sticker has the MBZemblem on the right, and alpha-numeric text on the right of the emblem making up 3 lines. One line has the code you are looking for, the other has the serial # of the radio.
Alternatively, contact a dealer near you, or send a letter to MBZ. If you send a letter to MBZ you must include the VIN #, and may want to include somthing to prove the you purchased the car and you shipped it to Africa.