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MercedesBenz key fob not working? You need change the keyless remote battery. Is your Mercedes key fob not working after a battery change? This video will help you troubleshoot problems where the Mercedes key fob doesn’t work or no longer unlock/locks doors or trunk. In most cases, the key can start the car but not work as a keyless entry remote. Usually when Mercedes key fob is not working, it’s because either because the key is defective or the All Activity Module (AAM) is not recognizing the key signal, or it is not receiving signal due to an antenna issue.

Mercedes key fob not working after battery change
Mercedes remote doesn’t work anymore
Keyless remote doesn’t lock/unlock the car
Mercedes key fob won’t unlock doors
Panic button doesn’t work
Trunk unlock doesn’t work

19952005 MercedesBenz S500