Part One

Audio System Description

Overview

The audio unit acts as the processor for all audio functions. You can select the audio functions from the front panel, the audio remote switch (on the steering wheel), or by using the navigation voice control system. The audio display provides the current audio status. For vehicles with the navigation system, additional audio information is available by touching the audio button (see the Owner's Manual for more details).

The XM receiver, the USB adapter control unit, and the audio disc changer pass their signals to the audio unit. In addition, they communicate with the audio unit via the GA-Net bus. Any open connections or short in the wiring in the GA-Net bus circuit will cause audio (including the audio accessories) and navigation functions to appear inoperative.

With the premium audio system, a stereo amplifier powers the speakers, otherwise the speakers are powered directly by the audio unit.

The audio unit has a built-in EEPROM (electrically erasable programmable read-only memory). This memory holds the audio preset data (AM/FM radio frequency, sound settings) even when the battery power is removed.