See also:

Conserving electrical current
Keep the following in mind to help minimize battery drain: When the engine is not running, avoid using ignition mode II. Many electrical systems (the audio system, the optional navigation syste ...

Instrument panel lighting
The instrument panel lighting illuminates when the ignition key is in position II and the light switch (1) is in either position Move the thumb wheel (4) up to increase brightness or down to decr ...

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. ...