Keys, locks and alarm system › Alarm system 23
A trailer is integrated into the alarm system under
the following conditions:
Troubleshooting
The vehicle cannot be unlocked or locked using
the sensors on the handle
✓ The vehicle is factory-fitted with a towing device.
✓ The trailer is electrically connected to the vehicle
via the trailer socket.
✓ The trailer is not equipped with LED taillights.
Lock or unlock the vehicle with the button on the
key.
›
Then try to unlock or lock the vehicle using the
sensors on the handle.
›
If the electrical connection to the trailer is interrup-
ted on a vehicle with an activated alarm system,
warning signals are triggered.
If keyless locking does not work, seek the help of a
specialist garage.
›
Disable the alarm before connecting or discon-
necting a trailer.
If the vehicle is not unlocked for a longer period
of time, the function can be deactivated automati-
cally.
When the ignition was switched on, no key was
found
Settings
illuminates
The following functions of the alarm system can be
deactivated at the same time:
Message that no key was found in the vehicle
Insert the key into the vehicle.
Interior monitoring
Towing protection
▶
▶
›
Deactivation will also switch off the SAFE func-
tion » page 20, Functionality.
Alarm system
Functionality
Deactivation
By double locking within 2 seconds.
▶
The alarm system triggers audible and visual signals
during a break-in or towing attempt.
Or:
The alarm system is activated automatically approxi-
mately 30 seconds after the vehicle is locked.
▶ In infotainment in the menu
item for interior monitoring
Menu
The alarm system is automatically deactivated after
the vehicle is unlocked.
Or:
▶ In infotainment in the menu
Menu item for interior monitoring
Alarm triggering
The activated alarm system triggers an alarm when
one of the following events occurs:
The deactivated functions are reactivated after the
vehicle is unlocked and locked again.
Opening the bonnet
Opening the boot lid
Opening the door
Manipulation of the ignition lock
Towing the vehicle
Movement in the vehicle
▶
▶
▶
▶
▶
▶
▶
Deactivation is to be carried out if the vehicle is,
for example, towed or transported.
Sudden and significant voltage drop of the electri-
cal system
Uncoupling the trailer
Opening the door unlocked via the lock cylinder
▶
▶
Switching off the triggered alarm
Unlock the vehicle.
›
Or:
Turn on the ignition.
›
Operating conditions
For the correct functioning of the alarm system, all
windows must be closed.
English 
