General notes

If the vehicle can no longer be locked or unlocked with the SmartKey, use the mechanical key.

If you use the mechanical key to unlock and open the driver's door or the trunk lid/ tailgate, the anti-theft alarm system will be triggered.

There are several ways to turn off the alarm:

•► To turn the alarm off with the SmartKey: press the button or on the SmartKey. button on the SmartKey.
or
•► Insert the SmartKey into the ignition lock.
or
•► To deactivate the alarm with KEYLESSGO: press the Start/Stop button in the ignition lock. The SmartKey must be in the vehicle.
or
•► Lock or unlock the vehicle using KEYLESSGO.

The SmartKey must be outside the vehicle.

If you unlock the vehicle using the mechanical key, the fuel filler flap will not be unlocked automatically.

•► To unlock the fuel filler flap: insert the SmartKey in the ignition lock.

    See also:

    Low-beam headlamps (halogen headlamps)
    Due to their location, have the bulbs in the left-hand headlamp changed at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center. •► Switch off the lights. •► ...

    Resetting to factory settings
    For safety reasons, the Day Lights function in the Lights submenu is only reset when the vehicle is stationary. •► Press the button on the steering wheel to select the Settings menu. ...

    Changing the battery
    You require a CR 2025 3 V cell battery. - Take the mechanical key out of the SmartKey. - Press mechanical key 2 into the opening in the SmartKey in the direction of the arrow until battery t ...