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.
function of the SmartKey. Point the tip of the SmartKey at 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:
Check the SmartKey battery and replace it if necessary.
Lock or unlock the vehicle using the mechanical key.
The SmartKey is faulty.
Lock or unlock the vehicle using the mechanical key.
Have the SmartKey checked at a qualified specialist workshop.
You can no longer lock or unlock the vehicle using KEYLESS-GO. KEYLESS-GO is in standby mode because the vehicle has not been unlocked for an extended period.
ignition lock. Pull the door handle twice and then insert the SmartKey into the ignition lock.
There is interference from a powerful source of radio waves.
SmartKey. Point the tip of the SmartKey at the driver's door handle from 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.
SmartKey. Point the tip of the SmartKey at the driver's door handle from 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.
Have KEYLESS-GO checked at a qualified specialist workshop.
If this does not work:
Check the SmartKey battery and replace it if necessary.
Lock or unlock the vehicle using the mechanical key.
You have lost a SmartKey. workshop. Have the SmartKey deactivated at a qualified specialist workshop.
Report the loss immediately to the vehicle insurers.
If necessary, have the locks changed as well.
You have lost the mechanical key. Report the loss immediately to the vehicle insurers.
If necessary, have the locks changed as well.
The engine cannot be started using the SmartKey. The on-board voltage is too low.
Remove the SmartKey and reinsert it into the ignition lock.
ignition lock. Start the engine within 30 seconds of inserting the SmartKey in the ignition lock.
Repeat if necessary.
If the engine does not start after several attempts:
Check the starter battery and charge it if necessary.
or
Jump-start the vehicle.
or
Consult a qualified specialist workshop.
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.
Close the door and try to start the vehicle again.
There is interference from a powerful source of radio waves.
Start your vehicle with the SmartKey in the ignition lock.
    See also:

    Locking the vehicle (mechanical key)
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    Belt height adjustment
    You can adjust the seat belt height on the driver's seat and the front-passenger seat. Adjust the height so that the upper part of the seat belt is routed across the center of your shoulder. ...

    Service and literature
    Your vehicle is covered under the terms of the warranties printed in the Service and Warranty Information booklet. Your authorized Mercedes-Benz Center will exchange or repair any defective pa ...