Part 1
Audio System Description
Overview
The audio unit acts as the processor for all audio functions. Select audio functions from the audio unit, the audio remote (on the steering wheel), or by using the navigation voice control system. The audio display provides the current 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 XM receiver and audio disc changer 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 and navigation functions to appear inoperative.
For vehicles with navigation, pressing the open/close switch on the navigation display panel allows access to the CD slot and PC card.
A security signal is daisy-chained between the audio and vehicle components and integrated into the vehicle's security system.
Speed-sensitive volume compensation (SVC)
Some audio systems are equipped with speed-sensitive volume compensation (SVC). The navigation or audio unit receives the vehicle speed pulse (VSP) from the PCM. The system processes the speed input and increases the navigation or audio system volume level as the vehicle speed increases to compensate for the various interior noise that occurs at higher speeds. When the vehicle slows down, the volume returns to its normal level. The SVC has four settings: SVC OFF, LOW, MID and HIGH that can be adjusted using the navigation or the audio unit. The SVC comes from the factory with MID set as the default.
To change the audio unit SVC setting, press the tune folder sound knob repeatedly until the SVC is displayed, then rotate the knob to adjust the SVC to the desired setting (SVC OFF, LOW, MID, or HIGH)
To change the audio-navigation unit SVC setting, press the AUDIO button, and then select the SOUND icon on the navigation display. Press the navigation display to select the desired setting (OFF, LOW, MID, HI)
Muting Logic
On vehicles with navigation, the navigation system provides voice control for the audio system, the XM radio, the PC card, and the CD player. The GA-Net (audio unit) communicates the voice control commands. When using the navigation TALK/BACK buttons, 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 while the rear speakers continue to play. For more information, see the navigation the HFL section. The outline of the interruption function is shown in this table.
USB Adapter
The audio unit can play digital music from portable audio players, USB drives, etc. when the device is plugged into the USB adapter. The audio unit uses the GA-NET to allow you to control the device from the audio 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.
Anti-theft Feature
The audio-navigation unit or 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-navigation unit connector A (24P) or audio unit connector A (17P).
- Removing the No. 17 (15 A) fuse from the under-hood 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 Initial Inspection and Diagnostic Overview. 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.
With navigation
Without navigation
USB function
Music files can be stored on portable USB devices (flash drives and approved iPod products) and played through the audio unit by using the USB adapter. Although a customer can create many different folder levels on their USB device, the audio 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 High speed USB capable (maximum speed is 480Mbps)
- At least 256MB 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 unit software is constantly updated.
The audio unit displays the folder differently than what you may see on your PC because the audio unit only recognizes two folder levels. The audio unit overwrites the data for the track order when you connect the USB device. The audio 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 drive, the data for the track order remains in the audio unit's memory so when you reconnect the same USB drive, the audio unit continues playing from the location where it was disconnected. If a new USB drive is connected, the data for the track order is rewritten and you need to select the album or music file.
USB Function list
Save constitution
When you plug in a USB drive, the audio unit or audio-navigation unit automatically searches the USB drive for playable music files. See the owner's manual for more information about navigating USB menus and selecting music.
USB with audio units
The audio unit only recognizes two levels of folders and automatically sorts the music to meet this requirement. Playable music files not located in a folder are automatically listed in a folder titled ROOT or FOLDER 1 that the audio unit automatically creates. If your customer complains that they can't find some songs loaded on their USB drive, recommend that they check the ROOT folder or FOLDER 01 for the missing music files.
USB with audio-navigation units
When you plug in a USB drive, the audio-navigation unit automatically searches the USB drive for playable music files. See the owner's manual for more information about navigating USB menus, selecting music, and music file compatibility.
The audio unit organizes the playable music folders and files that appear on the USB drive. If there are any music files that are not located in a folder, the audio unit automatically creates a folder titled ROOT, and lists all these playable music files in it. If your customer complains that they can't find some songs loaded on their USB drive, 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 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.
iPod
iPod operation
When an iPod is connected to the audio unit with the USB adapter, you can navigate through the iPod's music files with the VOL/SELECT KNOB and the key on the audio unit. You cannot use the iPod's controls.
When you connect an iPod to the audio unit with the AUX connection, you can use the iPod's controls, but not the VOL/SELECT KNOB as the AUX connection is only a sound input terminal.
Because hardware and software continually change, make sure the iPod is compatible with the vehicle by referring to the applicable owner's manual.
Audio Glossary
NOTE: All items may not apply to this vehicle. See the owner's manual for more information.
Audio-Navigation Unit Connector for Inputs and Outputs ('07-09 models)
With navigation (Audio-navigation unit)
NOTE: Refer to the navigation section for audio-navigation unit connector C, D, F, and H input and outputs.
AUDIO-NAVIGATION UNIT CONNECTOR A (17P)
AUDIO-NAVIGATION UNIT CONNECTOR B (22P)
AUDIO-NAVIGATION UNIT CONNECTOR E (14P)
AUDIO-NAVIGATION UNIT CONNECTOR G (3P)
USA models
Canada models
