Audio System Description (With XM Radio)

Audio 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.

GA-Net Bus Configuration

The GA-Net bus passes audio commands throughout the audio components. These commands include hard button signals, audio/XM selections, 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.

USB Adapter

'09-11 models audio system with navigation can play digital music from portable audio players, a USB device, etc. when the device is plugged into the USB port. The audio-navigation unit uses the GA-Net to allow you to control the device from the audio-navigation unit when searching and playing the files. Not all players and player functions work with the USB adapter. Please see the Owner's Manual for more information.

USB Function

Music files can be stored on portable USB devices (flash drives and approved iPod products) and played through the audio-navigation unit by using the USB adapter. Although a customer can create many different folder levels on their USB device, the audio-navigation unit only recognizes two levels and automatically sorts the music to meet this requirement.

To play the music files, use the dial selector to find the folder where the music file is located, then select the album or music file (see the Owner's Manual for more information about selecting and playing USB files and approved iPod products).

USB Device Requirements

- 2.0 Full speed USB capable (maximum speed is 12 Mbps)
- At least 256 MB storage capacity
- USB formatted to be compatible with Windows-based operating systems
- If the USB has a security feature, like write protection, it must be turned off

There are many different USB drives, manufacturers, and configurations with new devices being released every day, which makes it impossible to test all USB devices with the audio system. Even if the USB device has all these requirements, it may not be compatible.

To check if a USB device is compatible with the vehicle, test the USB device in a known-good vehicle of the same model and year. If the USB device does not work on the known-good vehicle, assume that it is faulty or not compatible. A USB device may work on a later year of the same model vehicle because the audio-navigation unit software is constantly updated.

The audio-navigation unit displays the folder differently than what you may see on your PC because the audio-navigation unit only recognizes two folder levels. The audio-navigation unit overwrites the data for the track order when you connect the USB device. The audio-navigation unit does not modify the music files or the structure on the USB device.

Hard drives do not support overwriting the data for the track order, which is why they are not recommended.

Reconnecting the USB Device

When you disconnect a USB device, the data for the track order remains in the audio-navigation unit's memory so when you reconnect the same USB device, the audio-navigation unit continues playing from the location where it was disconnected. If a new USB device is connected, the data for the track order is rewritten and you need to select the album or music file.

USB Function List

USB Music Search

When you plug in a USB device, the audio-navigation unit automatically searches the USB device for playable music files. See the Owner's Manual for more information about navigating USB menus and selecting music.

USB with Audio-Navigation Units

When you plug in a USB device, the audio-navigation unit automatically searches the USB device for playable music files. See the Owner's Manual for more information about navigating USB menus, selecting music, and music file compatibility.

The audio-navigation unit organizes the playable music folders and files that appear on the USB device. If there are any music files that are not located in a folder, the audio-navigation unit automatically creates a folder titled ROOT, and lists all these playable music files in it. If your customer complains that they can not find some songs loaded on their USB device, recommend that they check the ROOT folder for the missing music files. If all the music files on the USB are in folders, the ROOT folder does not appear.

When there are music files not located in a folder, the audio-navigation unit automatically creates a folder named ROOT (A).

Select the Track List button to see the ROOT folder (A) which is automatically created only when there are music files not located in folders.

All the music files not located in folders are listed under the ROOT folder.

Muting Logic

The navigation system allows voice control of the audio, the XM, the PC card, and the CD player. Voice control commands are communicated on the GA-Net (audio-navigation unit). When using the navigation TALK/BACK button, the audio is muted on all speakers and you get navigation sound on the front channels. When using the navigation or route guidance (RG), the front speakers give the navigation sound and the rear speakers continue to play. For more information, see the navigation section. The outline of the interruption function is shown in this table.

System Diagram (With Navigation)

System Diagram (Without Navigation)

Audio Glossary

NOTE: All items may not apply to this vehicle. See the Owner's Manual for more information.

Audio Unit Connector for Inputs and Outputs (with navigation)

NOTE: Refer to the navigation system section for audio-navigation unit connector C, F, G, and H inputs and outputs.