The horn will beep once to tell you that auto lock was deactivated.
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Press the unlock button then press lock again.
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There is a couple of ways to fix this problem.
If so replace the fuse.
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Once the service request is processed the mercedes benz response center will notify the customer through e mail text message or you receive a telephone call to confirm that your vehicle has been unlocked.
On those models the door lock actuators may fail causing the door lock to bounce up and down several times.
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Click on the door unlock button.
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Turn the ignition back to off and listen for the horn to beep one time confirming that the programming was accepted.
Check your fuse box first to determine if a blown fuse is keeping the lock from working.
Dealing with mercedes benz ignition switches alarm systems locks as well as immobilizer systems is work best suited to a professional mercedes benz locksmith for proper maintenance and repair.
It will beep twice if you re reactivating the system.
The system then sends a signal to the customer s vehicle and unlocks the doors.
If just one lock won t open on your mercedes then the problem may rest with broken wiring a bad solenoid or perhaps with a blown fuse.