Anti-Theft Protection - Mercedes-Benz S-Class Series 2021 Operator's Manual

102 Opening and closing

Anti-theft protection

Function of the immobilizer
The immobilizer prevents your vehicle from being
started without the correct SmartKey.
The immobilizer is automatically activated when
the ignition is switched off and deactivated when
the ignition is switched on.
When leaving the vehicle, always take the Smart‐
Key with you and lock the vehicle. Anyone can
start the engine if a valid SmartKey has been left
inside the vehicle.
% In the event the engine cannot be started
(yet the vehicle's battery is charged), the
system is not operational. Contact an
authorized Mercedes-Benz Center or call
1-800-FOR-MERCedes (in the USA) or
1-800-387-0100 (in Canada).
ATA (anti-theft alarm system)
Function of the ATA system
If the ATA system is armed, a visual and audible
alarm is triggered in the following situations:
when a door is opened
R
when the trunk lid is opened
R
when the hood is opened
R
when interior protection is triggered
R
( page 103)
/
when the tow-away alarm is triggered
R
( page 103)
/
The ATA system is armed automatically after
approximately ten seconds in the following situa‐
tions:
after locking the vehicle with the SmartKey
R
after locking the vehicle using KEYLESS-GO
R
Indicator lamp 1 flashes when the ATA system
is armed.
The ATA system is deactivated automatically in
the following situations:
after unlocking the vehicle with the SmartKey
R
after unlocking the vehicle using KEYLESS-
R
GO