See also:

Adjusting sound quality and volume balance
Press the “TUNE/SEL” knob to enter iPod menu mode. Pressing the “TUNE/SEL” knob changes sound modes.  - About iPod • Apple is not responsible for the operation of this device o ...

“Information” screen
...

Installation of a mobile two-way radio system
The installation of a mobile two-way radio system in your vehicle could affect electronic systems such as: •  Multiport fuel injection system/sequential multiport fuel injection system •& ...