ATA (Anti-Theft Alarm system)
A visual and audible alarm is triggered if the alarm system is armed and you open:
- a door
- the vehicle with the mechanical key
- the trunk lid/tailgate
- the hood
The alarm is not switched off, even if you close the open door that has triggered it, for example.
If the alarm stays on for more than 30 seconds, the emergency call system mbrace (USA only) or TELE AID (Canada only) initiates a call to the Customer Assistance Center automatically. The emergency call system initiates the call provided that:
- you have subscribed to the mbrace/
TELE AID service.
- the mbrace/TELE AID service has been
activated properly.
- the required mobile phone, power supply
and GPS are available.
•► To arm: lock the vehicle with the SmartKey or KEYLESS-GO.
Indicator lamp 1 flashes. The alarm system is armed after approximately 15 seconds.
•► To deactivate: unlock the vehicle with the SmartKey or KEYLESS-GO.
•► To stop the alarm using the SmartKey: insert the SmartKey into the ignition lock.
The alarm is switched off.
or
•► Press the 
or
button on the
SmartKey.
The alarm is switched off.
•► To stop the alarm using KEYLESS-GO: grasp the outside door handle. The SmartKey must be outside the vehicle.
The alarm is switched off.
or
•► Press the Start/Stop button on the
dashboard. The SmartKey must be inside
the vehicle.
The alarm is switched off.
See also:
Important safety notes
We recommend that all infants and children be properly secured in an infant or
child restraint system at all times while the vehicle is in motion.
The use of seat belts and infant and child restrai ...
Safety
The 2012 M-Class was deemed a Top Safety Pick by the Insurance Institute for
Highway Safety, meaning it received the top score of Good in front- and
side-impact crash tests, as well as for roof st ...
Interior
The M-Class seats five people on front buckets and a three-place split rear
seat that folds to expand cargo space to 81.2 cubic feet. An optional two-place
third-row seat increases passenger capac ...