How to reset the stero in a mercedes

Enter the unlock code. This is the 3 ways to get the code.

https://www.fixya.com/support/r29874205-need_vehicle_radio_code

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Have you disconnected the battery or replaced a fuse lately? Could mean it needs the code entering.

usually the volume dail will slecet the numbers so say if u have a 7 in the code u would turn the volume controll. do u have the instructions for said stero? if not googled it. it will go through things step by step. be carefull cause if u get it wrong to often it will lock ur stero completey

It's under the back seat.

you should be able to take the code and use the numbers on the face of your radio.

You may have to leave your sterio SWITCHED ON ....UNDISTURBED for up to 24 hours for it to reset as the waiting time depends on how many wrong codes have been entered previously.(The time can double after each wrong code)

The important thing is the UNDISTURBED .Do not touch it once it is left on otherwise it starts the waiting time all over again

as i know of code normally be posted somewhere on top or behind stereo when you pull the whole stereo out,

Check the owners manual, there's a 4 digit code in one of the manuals for the radio...Try the code 1212 or 1111....if you enter the wrong code too many times it locks up and you have to disconnect the battery cable and re-connect it to reset the lock on the radio...call the dealership service department and a tech will provide you the correct code to unlock the radio

turn key on and hold down buttons 2 and 3 for 5 sec. radio should display a 4 didgit code. call dealer for unlock code. after getting code use seek and scan buttons to enter code then press th am/fm button.

it usually comes on a cd that has the unlock code on it if you dont have then the dealer might can get it for you