Locking the vehicle (mechanical key)

If the vehicle can no longer be locked with the SmartKey, use the mechanical key.

  • Open the driver's door.
  • Close the front-passenger door, the rear doors and the tailgate.
  • Press the locking button ().
  • Check whether the locking knobs on the front-passenger door and the rear doors are still visible. Press down the locking knobs by hand, if necessary.
  • Close the driver's door.
  • 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.

  • Turn the mechanical key clockwise as far as it will go to position 1.
  • Turn the mechanical key back and remove it.
  • Make sure that the doors and the tailgate are locked.
  • Insert the mechanical key into the SmartKey.

The antitheft alarm system is not armed. If you lock the vehicle as described above, the fuel filler flap is not locked. The antitheft alarm system is not armed.

    See also:

    Correct driver's seat position
    Observe the safety guidelines on seat adjustment •► Check whether you have adjusted seat = properly. Electrical seat adjustment (Y page 100) When adjusting the seat, make sure:   ...

    Restarting the tire pressure monitor
    WARNING It is the driver's responsibility to set the tire pressure to the recommended cold tire pressure. Underinflated tires affect the ability to steer or brake the vehicle. You might lose ...

    Cleaning the steering wheel and gear or selector lever
      Thoroughly wipe with a damp cloth or use leather care agents that have been recommended and approved by Mercedes- Benz. ...