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Stan
Stan, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3526
Experience:  Technical support engineer
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i have been away for one week i tried to unlock car with fob

Customer Question

i have been away for one week i tried to unlock car with fob , it wouldnt unlock i entered car with key alarm went off but car would not recognise key so i couldnt turn alarm off so i disconnected battery but alarm still going key fob battery is not flat.how do i turn alarm off and get car going it is as if car has forgotten the key code
Submitted: 2 years ago.
Category: Mercedes
Expert:  Stan replied 2 years ago.
Stan :

Hello,
I suggest to have the car's battery charged up first of all. If it is empty enough, the key will not be recognized. The siren on your car might have an independent battery.
If the main battery is fully charged up, then try to start the car with a spare key.
Switching the ignition on with properly working key will deactivate factory alarm.

Stan :

best regards,
Stan