System Description: Overview

The Audio Unit acts as the "processor" for all audio functions. Select audio functions from the front panel. The audio display provides the current audio status. (See the owner's manual for more details.)

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

The XM receiver passes its signal to the audio unit. In addition, it communicates with the audio unit via the GA-Net bus. Any open connections in the GA-Net bus circuit will cause audio functions to appear inoperative.