See also:

Activation
PAC is activated when the gear selector is moved to R if the system is selected in the MY CAR menu system or by pressing the CAM button in the center console. See page 133 for a description of t ...

Automatic locking
When the vehicle starts to move, the doors and tailgate can be locked automatically. This feature can be turned on or off by pressing MY CAR and going to Car settings Lock settings Aut ...

Low battery voltage
If the battery voltage is too low, the parking brake cannot be applied or released. Connect an auxiliary battery if the battery voltage is too low, see page 114. ...