On those models the door lock actuators may fail causing the door lock to bounce up and down several times.
Mercedes benz automatic door lock.
Turn the ignition back to off and listen for the horn to beep one time confirming that the programming was accepted.
If so replace the fuse.
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The system then sends a signal to the customer s vehicle and unlocks the doors.
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.
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.
Check your fuse box first to determine if a blown fuse is keeping the lock from working.
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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.
It will beep twice if you re reactivating the system.
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There is a couple of ways to fix this problem.
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The horn will beep once to tell you that auto lock was deactivated.