Automatic locking feature

The vehicle locks automatically when the ignition is switched on and the wheels of the vehicle are turning at a speed of more than 9 mph (15 km/h).

You could therefore be locked out when:
• the vehicle is being pushed.
• the vehicle is being towed.
• the vehicle is being tested on a dynamometer.

To deactivate: press and

hold button 1 for about five seconds until a tone sounds. To deactivate: press and hold button 1 for about five seconds until a tone sounds.
button 2 for about five seconds until a tone sounds. To activate: press and hold button 2 for about five seconds until a tone sounds.

buttons and If you press one of the two buttons and do not hear a tone, the relevant setting has already been selected.

You can also switch the automatic locking function on and off using the on-board computer.

    See also:

    Ride & Handling
    The M-Class evokes the S-Class' driving experience in a few ways. For one, it feels especially substantial and planted when cruising on the highway, enhancing driver confidence and lowering drivin ...

    Vehicle remote opening
    If you have unintentionally locked your vehicle (e.g. the SmartKey is still in the vehicle) and a replacement SmartKey is not available, the vehicle can be opened by a Mercedes-Benz Customer A ...

    Adjusting the front-passenger seat from the driver's seat
    WARNING When adjusting the front passenger seat, make sure the seat, if occupied, is as far from the front passenger front air bag as possible. Otherwise, the passenger could be seriously ...