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 trunk lid/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

•► 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 trunk lid/ tailgate are locked.
•► Insert the mechanical key into the SmartKey.

    See also:

    Under the Hood
    A 168-hp 2.6-liter V-6 engine in the C240 sedan and wagon teams with a six-speed-manual gearbox or an optional five-speed driver-adaptive automatic transmission that incorporates Touch Shift. A 21 ...

    Closing
    WARNING Monitor the closing procedure carefully to make sure no one is in danger of being injured. To prevent possible personal injury, always keep hands and fingers away from the trunk ope ...

    General notes
    If you cannot lock or unlock the vehicle with the SmartKey, either the battery in the SmartKey is discharged, the SmartKey is faulty or the starter battery is discharged. •► Check the bat ...