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Posted on Feb 15, 2011
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I have changed the battery in my mercedes key fob and now it wont lock or unlock the car. is a mercedes c280. been told i can re sync it inthe door lock but unsure how. any help greatly appreciated. cheers gary

  • garyraines69 Feb 15, 2011

    thanks for your advise, my problem being is its a 1995 c280 and only has one button on the key fob. key itself works just doesnt operate the locks from the key fob. was working fine untill i replaced the battery

    cheers gary

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1 Answer

ZJ Limited

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  • Mercedes-Benz Master 17,989 Answers
  • Posted on Feb 15, 2011
ZJ Limited
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Try this re-sync procedure, it is slightly different from the one in the manual...
------------------------------------------------------------------------------------------------------------------------------------------------
Synchronization of Transmitter keys:
In order to synchronize the transmitter keys, please perfom the following steps:
- Insert the transmitter into the ignition lock
- Test to see if the transmiter key has been recognized as valid (ATA status indicator lamp)
- Remove the transmitter key from ignition lock
- then within 1 minute. Press and hold the open button and at the same time press the "close all" button five (5) times. Lastly, press one of the desired buttons as necessary.
Only after the completed sunchronization process is the remote function of the transmitter possible.

Additionaly, it may be necessary to resynchronize a transmitter key if the transmitter battery has been replaced.
------------------------------------------------------------------------------------------------------------------------------------------------

Hope this helps.

  • ZJ Limited
    ZJ Limited Feb 16, 2011

    I suggest check the right owners manual in this link: 1999 C280 Owner's Manual, but can be applied for most C-Class cars
    including AMG Models from 1995-2000 please let me know if you found it
    useful (need free register).

    Good luck.

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