See also:

Clearing the programmed information
Individual buttons cannot be cleared, however to clear all programming, push and hold the two outside buttons and release when the indicator light begins to flash (in approximately 20 seconds) ...

Steering wheel switch for audio control
The audio system can be operated using the controls on the steering wheel. POWER on switch With the ignition switch in the ACC or ON position, push the SOURCE switch to turn the audio system o ...

Call volume
Adjusting the incoming or outgoing call volume may improve clarity if reception between callers is unclear. - Incoming calladjusting this setting allows you to hear a difference in volume. - ...