Mechanical key
General notes
If the vehicle can no longer be unlocked with the SmartKey, use the mechanical key.
If you use the mechanical key to unlock and open the driver's door, 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
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.
Removing the mechanical key

► Push release catch 1 in the direction of the arrow and at the same time, remove mechanical key 2 from the SmartKey.
See also:
Pedestrian recognition
WARNING
Pedestrian recognition may be impaired or
inoperative if:
• pedestrians are partially or entirely
obscured by objects, e.g. parked vehicles.
• the silhouette of the pedestrian in ...
Important safety notes
WARNING
For reasons of safety, have the NECK-PRO
head restraints/NECK-PRO luxury head
restraints checked at an authorized
Mercedes-Benz Center after a rear-end
collision.
WARNING
When p ...
Roadside Assistance button
Press and hold Roadside Assistance
button 1 for more than two seconds. This initiates a call to the Mercedes-Benz
Customer Assistance Center. The indicator lamp in Roadside Assistance but ...
