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.

1 To unlock X Turn the mechanical key counter-clockwise to position 1.
The door is unlocked.
■ Turn the mechanical key back and remove it.
■ Insert the mechanical key into the SmartKey.
Useful information
This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
...
Service and literature
Your vehicle is covered under the terms of the
warranties printed in the Service and
Warranty Information booklet. Your
authorized Mercedes-Benz Center will
exchange or repair any defective parts
...
Opening
You can only open the rear door after
unlocking it first.
► Press the button on the SmartKey.
► Press release button 1 and pull door
handle 2.
► Open the rear door. ...