Locking the vehicle

If the vehicle can no longer be locked with the SmartKey, you can lock it by taking the following steps.

Close the front-passenger door, the rear door on the front-passenger side and the tailgate.
Open the driver’s door and the rear door on the driver’s side.
Press the locking button on the driver’s door.

The locking knobs in the front-passenger door and in the rear doors drop down.

Press down the locking knobs in the frontpassenger and rear doors manually, if necessary.
Close the driver's door from the outside.
Press down the locking knob of the driver's door by reaching in through the open rear door.

your person and that it has not been left in Make sure that you have the SmartKey on your person and that it has not been left in the vehicle.

Close the rear door on the driver’s side.
Make sure that the doors and the tailgate are locked.

the fuel filler flap is not locked. The antitheft If you lock the vehicle as described above, the fuel filler flap is not locked. The antitheft alarm system is not armed.

    See also:

    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 ...

    AMG adaptive sport suspension system
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    BAS (Brake Assist System)
    Observe the "Important safety notes" section. BAS operates in emergency braking situations. If you depress the brake pedal quickly, BAS automatically boosts the braking force, th ...