Problems with the SmartKey

Problem Possible causes/consequences and Solutions
You cannot lock or unlock the vehicle using the SmartKey. The SmartKey battery is discharged or nearly discharged.
the vehicle using the remote control function of the SmartKey. Point the Try again to lock/unlock the vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and press the button./button. button.
If this does not work:
and replace it if necessary. Check the SmartKey battery and replace it if necessary.
using the mechanical key. Lock or unlock the vehicle using the mechanical key.
The SmartKey is faulty.
using the mechanical key. Lock or unlock the vehicle using the mechanical key.
at a qualified specialist workshop. Have the SmartKey checked at a qualified specialist workshop.
You can no longer lock or unlock the vehicle using KEYLESS-GO. There is interference from a powerful source of radio waves.
using the remote control function of the SmartKey. Point the tip of the Lock/unlock the vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and press the button./button. button.
There is a malfunction with KEYLESS-GO.
using the remote control function of the SmartKey. Point the tip of the Lock/unlock the vehicle using the remote control function of the SmartKey. Point the tip of the SmartKey at the driver's door handle from close range and press the button./button. button.
a qualified specialist workshop. Have KEYLESS-GO checked at a qualified specialist workshop.
If this does not work:
and replace it if necessary. Check the SmartKey battery and replace it if necessary.
using the mechanical key. Lock or unlock the vehicle using the mechanical key.
You have lost a SmartKey. deactivated at a qualified specialist workshop. Have the SmartKey deactivated at a qualified specialist workshop.
to the vehicle insurers. Report the loss immediately to the vehicle insurers.
locks changed as well. If necessary, have the locks changed as well.
You have lost the mechanical key. immediately to the vehicle insurers. Report the loss immediately to the vehicle insurers.
locks changed as well. If necessary, have the locks changed as well.
The engine cannot be started using the SmartKey. The on-board voltage is too low.
consumers, e.g. seat heating or interior lighting, and try to start the Switch off non-essential consumers, e.g. seat heating or interior lighting, and try to start the engine again.
If this does not work:
and charge it if necessary. Check the starter battery and charge it if necessary.
or
or Jump-start the vehicle.
or
specialist workshop. Consult a qualified specialist workshop.
The engine cannot be started using the SmartKey. The steering lock is mechanically blocked.
reinsert it into the ignition lock. While doing this, turn the steering Remove the SmartKey and reinsert it into the ignition lock. While doing this, turn the steering wheel in both directions.
The engine cannot be started using KEYLESS-GO. The SmartKey is in the vehicle. A door is open. Therefore, the SmartKey cannot be detected as easily.
start the vehicle again. Close the door and try to start the vehicle again.
There is interference from a powerful source of radio waves.
SmartKey in the ignition lock. Start your vehicle with the SmartKey in the ignition lock.
    See also:

    The M-Class also protects its occupants after a crash
    As part of the POST-SAFE® functions, the new M-Class can activate a variety of systems which can contribute towards avoiding post-accident risks. After a more serious crash, the hazard warning lig ...

    Adjusting the four-way lumbar support
    You can adjust the contour of the front seat backrests individually to provide optimum support for your back. Adjusting the four-way lumbar support 1 To raise the backrest contour 2 To soften ...

    Activating/deactivating
    WARNING Any accumulation of snow and ice should be removed from the rear window before driving. Visibility could otherwise be impaired, endangering you and others. The rear window defroster h ...