Open and close lock to recalibrate.
Mercedes a class door lock fault.
You likely have a shorted door lock actuator which you can replace with a new unit for the lock that is not working.
Apply wd 40 or equivalent product directly into the lock.
Because your mb receives the lock unlock signal via the antennas installed on your car a bad antenna module fuse can also cause mercedes key fob to stop working.
If a door unlocks but will not lock again then replace the door switch.
Depending on the mb class this fuse can be found in one of the fuse boxes located in the engine bay side of dashboard under rear seat or trunk.
Mercedes c e s class clk slk throttle bodies failing mercedes cl and sl class soft top convertible roof controllers failing mercedes 280 300 350 ecu mercedes 300 amg 300 ecu mercedes clk 320 sl 280 sl 320 ecu mercedes vdo ecu systems being damaged by harness overheating mercedes seimens and bosch ignition modules failing mercedes e class abs.
Mercedes benz vehicles such as e c s ml gl r class are designed to automatically lock the doors as soon as you start to drive.
I have seen plenty of people complaining of the same fault.
C class drivers have described the problem as electronic door locks that function properly when activated remotely however when the doors are actuated from inside the vehicle they fail to lock properly.
Bouncing door lock is a common failure on mercedes cars.
Perhaps your mercedes locks work but they open and close slowly.
Mercedes benz keyless go entry door exterior handle push lock button square cover rubber plastic repair kit install instructions.
If you find a blown fuse replace it.
With its varied options for technological conveniences a major inconvenience some c class owners have found is door lock faults on their new c class mercedes vehicles.
The problemit is common for the keyless go door handle rubber button to wear spoiling the look of the door handle it is very common for the small black rubber keyless go button on these vehicles door handles to fail.