See also:

Ignition switch and steering wheel lock
A The gear selector must be in the P (Park) position (automatic transmission). B Please be aware that leaving the key in this position will increase battery drain. ...

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 ...

Temporary deactivation
The driver can temporarily deactivate cruise control by pressing 0. The saved speed is shown in brackets in the information display. ...