SmartKey battery

See also:

How the occupant classification system works
The Occupant Classification System (OCS) categorizes the occupant on the front - passenger seat by means of a weight sensor. The front-passenger front air bag is deactivated automatically for c ...

Notes for 4MATIC vehicles
Vehicles with 4MATIC must not be towed with either the front or the rear axle raised, as doing so will damage the transmission. If the vehicle has transmission damage or damage to the front or ...

Belt warning for the driver and front passenger
Regardless of whether the driver and front passenger have fastened their seat belts already, the seat belt warning lamp lights up for 6 seconds after every engine start. It then goes out if t ...