System Description

System Description

Overview

The Audio Unit acts as the "processor" for all audio and video signals (RES). Selection of the audio functions can be done from the front panel, the audio remote (on steering wheel), or by using the navigation voice control system. The audio display provides the current front and rear audio status. For vehicles with the navigation option, additional audio information is available by touching the audio button.

Each audio component passes its audio or video signal to the audio. In addition it communicates with the audio unit via the GA-Net bus. Any open connection in this circuit will cause audio, and navigation functions to appear inoperative.

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

The system includes an active noise control system to cancel some of the vehicle noise. It use a sine wave-shaped sound output to cancel noise developed during cylinder cancel operation. This occurs in the 1,500-2,400 rpm range. Two microphones detect the low frequency sound, and the system outputs a canceling sound through the audio speaker.




The 6CD Changer output can be directed either to the front or in the rear. For vehicles with the navigation option, pressing the "open/close" switch on the navigation display panel accesses the CD unit.

The XM can be output to either the front or the rear RES. However if XM is playing in the front, the CD changer cannot be used for the RES. The RES (DVD player) can be used to play a CD in the rear.

A Security signal is daisy-chained between the audio, optional RES, and navigation components for integration into the vehicle's alarm system.

The RES consists of DVD player, a rear controller/screen, and an auxiliary jack assembly.

The optional navigation system provides voice control for front/rear audio, XM, CD player, and RES functions. Voice control commands are communicated on the GA-Net (audio bus). When the navigation unit is giving voice guidance, only the front speakers are muted. When using the voice control system, all speakers are muted, but not the RES headphones. Muting commands are passed on the GA-Net bus. For more information, see the navigation system.

System Diagram:

System Diagram