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:
4MATIC (permanent four-wheel drive)
4MATIC ensures that all four wheels are
permanently driven. Together with ESP®, it
improves the traction of your vehicle
whenever a drive wheel spins due to
insufficient grip.
WARNING
If a ...
Brake fluid level
If you notice that the brake
fluid level in
the brake fluid reservoir has fallen to the
MIN mark or less, check the brake system
immediately for leaks. Also check the
thickness of the brake ...
Using the SmartKey
– Turn the SmartKey to position 0 in the
ignition lock and remove it.
The immobilizer is activated.
If you turn off the engine with the
SmartKey and then remove it from the
ignition lock ...
