2014-2021 Mercedes C Class 4 Door Opening and closing -> Anti-theft protection User Manual
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Opening and closing -> Anti-theft protection for Your Mercedes C Class 4 Door Fourth Generation (2014-2021)

92 Opening and closing  
The immobiliser is automatically activated when  
the ignition is switched off and deactivated when  
the ignition is switched on.  
ATA (Anti-Theft Alarm system)  
Function of the ATA system  
If the ATA system is primed, a visual and audible  
alarm is triggered in the following situations:  
R
when a door is opened  
R
when the boot lid is opened  
R
when the bonnet is opened  
R
when interior protection is triggered  
(/ page 93)  
R
when tow-away protection is triggered  
(/ page 93)  
#
To extend or retract: press button 1.  
Indicator lamp 1 flashes when the ATA system  
is primed.  
The ATA system is primed automatically after  
approximately ten seconds in the following situa‐  
tions:  
Anti-theft protection  
Function of the immobiliser  
The ATA system is deactivated automatically in  
the following situations:  
R
after unlocking the vehicle with the key  
R
after locking the vehicle with the key  
The immobiliser prevents your vehicle from  
being started without the correct key.  
R
after unlocking the vehicle using KEYLESS-  
GO  
R
after locking the vehicle using KEYLESS-GO  
Opening and closing 93  
R
Priming/deactivating tow-away protection  
after pressing the start/stop button with the  
key in the stowage compartment  
(/ page 152)  
Tow-away protection is automatically primed  
after approximately 60 seconds:  
Multimedia system:  
R
after locking the vehicle with the key  
4
5
Vehicle  
î Vehicle settings  
R
% When the Mercedes‑Benz emergency call  
system is active and the alarm sounds for  
more than 30 seconds, a message is auto‐  
matically sent to the Customer Assistance  
Centre (/ page 336).  
after locking the vehicle using KEYLESS-GO  
5
Tow-away protection  
#
Tow-away protection is only primed when the fol‐  
lowing components are closed:  
Activate O or deactivate ª the function.  
Tow-away protection is primed again in the fol‐  
lowing cases:  
R
the doors  
R
the boot lid  
R
R
R
The vehicle is unlocked again.  
A door is opened.  
The vehicle is locked again.  
Deactivating the ATA  
#
Press the Ü, ß or p button on the  
key.  
or  
Tow-away protection is automatically deactiva‐  
ted:  
R
after pressing the Ü or p button on  
the key  
after pressing the start/stop button with the  
key in the stowage compartment  
(/ page 152)  
after unlocking the vehicle using KEYLESS-  
GO  
#
Press the start/stop button with the key in  
the stowage compartment (/ page 152)  
Function of interior protection  
R
When interior protection is primed, a visual and  
audible alarm is triggered if movement is detec‐  
ted in the vehicle interior.  
Interior protection is primed automatically after  
approximately ten seconds:  
Deactivating the alarm using KEYLESS-GO  
#
Grasp the outside door handle with the key  
outside the vehicle.  
R
R
when using HANDS-FREE ACCESS  
R
after locking the vehicle with the key  
Function of tow-away protection  
Information on collision detection on a parked  
vehicle (/ page 182).  
R
after locking the vehicle using KEYLESS-GO  
An audible and visual alarm is triggered if an  
alteration to your vehicle's angle of inclination is  
detected while tow-away protection is primed.  
94 Opening and closing  
Priming/deactivating interior protection  
Interior protection is only primed when the fol‐  
lowing components are closed:  
Multimedia system:  
R
the doors  
4
5
Vehicle  
î Vehicle settings  
R
the boot lid  
5
Interior motion sensor  
#
Interior protection is automatically deactivated:  
Activate O or deactivate ª the function.  
R
after pressing the Ü or p button on  
the key  
Interior protection is primed again in the follow‐  
ing cases:  
R
R
after pressing the start/stop button with the  
The vehicle is unlocked again.  
A door is opened.  
The vehicle is locked again.  
key in the stowage compartment  
R
(/ page 152)  
after unlocking the vehicle using KEYLESS-  
GO  
R
R
R
when using HANDS-FREE ACCESS  
The following situations can lead to a false  
alarm:  
R
moving objects such as mascots in the vehi‐  
cle interior  
R
when the side window is open  
R
when the sliding sunroof is open  
R
when the panoramic sliding sunroof is open  

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