Question about 2007 Mercedes-Benz ML320 CDI

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Mercedes key fob wont lock the doors.might have a piecec missing from the circuit once opened up.

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Hi, it’s pretty difficult to lose a part of the circuit as you describe. So assuming that you have placed new fresh batteries correctly in the key – making sure that the polarity is correct! (easy to get wrong!) the key will need to be synchronised to the cars ignition / management system. You don’t say which model or year your Merc is, but most have a similar way of re – synchronising the Key to the car. It’s pretty easy and you lose nothing by trying it anyway.

Synchronising the locking system
If the vehicle cannot be locked or unlocked, first check the remote control unit batteries (see below). If the battery charge indicator lamp lights up, this means the system needs to be synchronised.
To do this, direct the remote control unit at the car and briefly press the Lock or Unlock button twice. Within approximately 30 seconds, put the key in the ignition lock and turn the key to position 2. The locking system should now be operative.

Battery Check
Press either the Lock or Unlock button and hold for longer than one second. The light on the key lights up briefly if the battery is OK. if it does not light up, replace the batteries immediately. Mercedes will charge a small fortune for these, so try elsewhere, they are pretty common and will cost substantially less.

If re – synchronising the Key fails to solve the problem, check that the Central locking fuse in the cars main fuse box is OK.

Hope this solves the problem – Let me know? Good luck!

Posted on Jul 08, 2009

  • cornwellnet Jul 08, 2009

    SORRY! just noticed that you did say which Model and year the car was - It must be my age or something........Good luck, hope it works....Cornwellnet

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