Unlocking the driver's door (mechanical key)
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.
Take the mechanical key out of the
SmartKey.
Insert the mechanical key into the lock of
the driver's door as far as it will go.

Firmly turn the mechanical key
counterclockwise as far as it will go to
position 1 and hold it in this position.
Pull the door handle quickly.
The locking knob pops up.
The door is unlocked.
Turn the mechanical key back and remove
it.
Pull the door handle again.
Insert the mechanical key into the
SmartKey.
See also:
Utility
With all that power under the M-Class' hood, along with its sporty nature and
comfortable cabin, it's easy to forget this is still an SUV. That means the
M-Class better do a good job of hauling th ...
Parking brake
WARNING
Engaging the parking brake while the vehicle
is in motion can cause the rear wheels to lock
up. You could lose control of the vehicle and
cause an accident. In addition, the ve ...
M+S tires
At temperatures below 45 °F(+7 °C), use
winter tires or all-season tires. Both types of
tire are identified by the M+S marking.
Only winter tires bearing the
snowflake
symbol in addition to t ...
