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Keys, doors and windows29Vehicle security
Anti-theft locking system9 Warning
Do not use the system if there are
people in the vehicle! The doorscannot be unlocked from the
inside.
The system deadlocks all the doors. All doors must be closed otherwise
the system cannot be activated.
If the ignition was on, the driver's door
must be opened and closed once so
that the vehicle can be secured.
Unlocking the vehicle disables the
mechanical anti-theft locking system.
This is not possible with the central
locking button.
Activating
Press e on the radio remote control
twice within 15 seconds.
Anti-theft alarm system
The anti-theft alarm system is
combined with the anti-theft locking
system.
It monitors: ● doors, tailgate, bonnet
● passenger compartment including adjoining load
compartment
● vehicle inclination, e.g. if it is raised
● ignition
Activation ● Self-activated 30 seconds after locking the vehicle by pressing e
once.
● Directly by pressing e twice
briefly within five seconds.
Note
Changes to the vehicle interior such
as the use of seat covers, and open
windows or sunroof, could impair the function of passenger compartment
monitoring.
Page 32 of 295

30Keys, doors and windowsActivation without monitoring of
passenger compartment and
vehicle inclination
Switch off the monitoring of
passenger compartment and vehicle
inclination when animals are being
left in the vehicle, because of high
volume ultrasonic signals or
movements triggering the alarm. Also switch off when the vehicle is on a
ferry or train.
1. Close tailgate, bonnet, windows and sunroof.
2. Press o. LED in the button o
illuminates for a maximum of ten minutes.
3. Close doors.
4. Activate the anti-theft alarm system.
Status message is displayed in the
Driver Information Centre.
Status LED
Status LED is integrated in the sensor
on top of the instrument panel.
Status during the first 30 seconds of
anti-theft alarm system activation:
LED illuminates:test, arming delayLED flashes
quickly:doors, tailgate or
bonnet not
completely closed,
or system faultStatus after system is armed:LED flashes
slowly:system is armed
Seek the assistance of a workshop in
the event of faults.
Deactivation
Unlocking the vehicle by pressing c
deactivates the anti-theft alarm
system.
The system is not deactivated by
unlocking the driver's door with the
key or with the central locking button
in the passenger compartment.
Alarm
When triggered, the alarm horn
sounds and the hazard warning lights flash simultaneously. The numberand duration of alarm signals are
stipulated by legislation.
The alarm can be silenced by
pressing any button on the radio
remote control or by switching on the
ignition.
The anti-theft alarm system can be
deactivated only by pressing c or by
switching on the ignition.
Page 113 of 295

Instruments and controls111Telematics service
OnStar
OnStar is a personal connectivity and
service assistant with integrated
Wi-Fi hotspot. The OnStar service is
available 24 hours a day, seven days
a week.
Note
OnStar is not available for all
markets. For further information,
contact your workshop.
Note
In order to be available and
operational, OnStar needs a valid
OnStar subscription, functioning
vehicle electrics, mobile service and GPS satellite link.
To activate the OnStar services and
set up an account, press Z and speak
with an advisor.Depending on the equipment of the
vehicle, the following services are available:
● Emergency services and support
in the case of a vehicle
breakdown
● Wi-Fi hotspot
● Smartphone application
● Remote control, e.g. location of the vehicle, activation of horn and
lights, control of central locking
system
● Stolen vehicle assistance
● Vehicle diagnostics
● Destination download
Note
The OnStar module of the vehicle is
deactivated after ten days without an
ignition cycle. Functions requiring a
data connection will be available
again after switching on the ignition.OnStar buttons
Note
Depending on the equipment, the
OnStar buttons can also be
integrated in the rear view mirror.
Privacy button
Press and hold j until a message is
heard to activate or deactivate the transmission of the vehicle location.
Press j to answer a call or to end a
call to an advisor.
Press j to access the Wi-Fi settings.
Service button
Press Z to establish a connection to
an advisor.
Page 290 of 295

288IndexAAccessories and vehicle modifications .......................... 201
Active Emergency Braking .........174
Active head restraints ...................40
Adaptive cruise control .........93, 163
Adaptive forward lighting ....93,
121, 212
Adjustable air vents ...................138
Airbag and belt tensioners ...........88
Airbag deactivation ................54, 88
Airbag system .............................. 51
Air conditioning regular operation ................................ 139
Air conditioning system .............. 131
Air intake .................................... 138
Air vents...................................... 138
Antilock brake system ................ 153
Antilock brake system (ABS) .......90
Anti-theft alarm system ................29
Anti-theft locking system .............. 29
Appearance care ........................250
Armrest ................................... 47, 48
Armrest storage ........................... 63
Ashtrays ....................................... 80
Automatic anti-dazzle ..................33
Automatic light control ...............118
Automatic locking ........................26
Automatic transmission .............148Autostop..................................... 143
Auxiliary heater ........................... 137
B Battery discharge protection ......129
Battery voltage ........................... 103
Belts.............................................. 48 Bonnet ....................................... 202
Brake and clutch fluid .................255
Brake and clutch system .............89
Brake assist ............................... 155
Brake fluid .................................. 206
Brakes ............................... 153, 206
Breakdown.................................. 248
Bulb replacement ....................... 209
C
Capacities .................................. 269
Car Pass ...................................... 23
Catalytic converter .....................148
Central locking system ................24
Centre console lighting ..............128
Centre console storage ...............64
Changing tyre and wheel size ...235
Charging system .......................... 89
Child locks ................................... 26
Child restraint installation locations ................................... 58
Child restraints.............................. 55
Child restraint systems ................55
Cigarette lighter ........................... 80