General notes
If the vehicle can no longer be locked or unlocked with the SmartKey, use the mechanical key.
If you use the mechanical key to unlock and open the driver's door or the trunk lid, the anti-theft alarm system will be triggered.
There are several ways to turn off the alarm:
 To turn the alarm off with 
the SmartKey: press the 
 or
 button on the SmartKey.
or
 Insert the SmartKey into the 
ignition lock.
or
 To deactivate the alarm with 
KEYLESS-GO: 
press the Start/Stop button in the 
ignition lock. The SmartKey must be in the 
vehicle.
or
 Lock or unlock the vehicle using 
KEYLESS-GO. The SmartKey must be outside the 
vehicle.
If you unlock the vehicle using the mechanical key, the fuel filler flap will not be unlocked automatically.
 To unlock the fuel filler 
flap: insert the SmartKey in the ignition lock.
See also:
Exterior & Styling
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original M-Class — so much so that a passenger walked up to an older M thinking 
it was the GL. The GL550's 21-inch wheels ...
   
Tires
   
 The specified tire pressure is printed in yellow on the 
emergency/collapsible spare wheel. ...
   
Switching to MUSIC REGISTER
    Select Audio in the main function bar by 
sliding  and turning
 the COMAND 
controller and press  to confirm.
If MUSIC REGISTER was the last mode 
selected, it is now switched on.
If another au ...
   
