See also:

Audio Remote Controls
Allows you to operate the audio system while driving. MODE Button Cycles through the audio modes as follows: VOL Button Press  : Increases the volume. Press : Decreases the volume. ...

Features
Audio System Audio Remote Controls  - VOL (Volume) Button Press and release to adjust the volume up/ down.  - MODE Button Press and release to change the audio mode: FM1/FM2/AM/XM1* ...

Instrument Panel
...