Radio, Stereo, and Compact Disc: Description and Operation

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 front audio status. For vehicles with navigation, additional audio information is available by touching the audio button on the navigation audio screen (See the Owner's Manual and the navigation system manual for more details.)

The audio disc changer, XM receiver, and navigation unit send 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.

For vehicles with the navigation option, pressing the open/close switch on the navigation display panel allows accesses to the audio disc changer unit.

A security signal is daisy-chained between the audio and navigation components for integration into the vehicle's security system.

Muting Logic

On vehicles with navigation, the system provides voice control for the audio system and the XM radio. The navigation system uses the GA-Net bus to communicate the voice control commands to the audio unit. When using the navigation TALK/BACK button, the audio is muted on all speakers and you hear navigation sound on the front speakers. When using the navigation or route guidance (RG), the front speakers provides the navigation sound and the rear speakers continue to play the audio. For more information, see the navigation and the HFL sections. The outline of the muting logic is shown in this table.

Anti-Theft Feature

The audio unit has a coded theft protection circuit. Make sure you have the anti-theft security code before:

- Disconnecting the 12 volt battery.
- Disconnecting the audio unit connector A (24P).
- Removing the No. 5 (20 A) fuse from the under-dash fuse/relay box.

When the audio unit is reconnected to the power and the ignition switch is turned to ON (II), "ENTER CODE" is displayed. Then, enter the 4-digit anti-theft security code.

When replacing the audio unit, be sure to give the customer the new anti-theft security code.

Pairing a cell phone

To pair a cell phone, refer to paring a cell phone in the HandsFreeLink system. Once a cell phone is paired, process does not have to be repeated for the phone.

GA-Net Bus Configuration

The GA-Net bus passes audio and navigation commands throughout the navigation and audio components.

These commands include navigation touch screen and hard button signals, audio/XM selections by voice, and XM station and music title names. Because the entire bus is daisy-chained between components (see diagram), any open or short in the GA-Net bus harness will cause any or all of these functions to become inoperative. The addition of any audio accessory must maintain the continuity of the GA-Net bus by installing the Y cable included with the accessory kit.