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.
Occupant Classification System
(OCS)
Method of operation
WARNING
If the indicator lamp
illuminates
when an adult or someone larger than a small
individual is in the front passenger seat, have
the front passenger reposition himself ...
ATA (anti-theft alarm system)
■ 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 switch off using the SmartKey:
...
ECO start/stop function (AMG
vehicles)
Important safety notes
WARNING
If the engine is switched off automatically and
you exit the vehicle, the engine is restarted
automatically. The vehicle may begin moving.
There is a risk of acci ...