See also:

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. ...

Main AUX menu
AUX menu AUX input volume Audio settings ...

Label information
1 Model plate: includes e.g., Vehicle Identification Number (VIN), codes for color and upholstery, etc. The model plate is located on the rear side of the B-pillar (the pillar between the front ...