Radio, Stereo, and Compact Disc: Description and Operation
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 switch (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 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.
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 audio-navigation unit or audio unit receives the vehicle speed pulse (VSP) from the ECM/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 noises that occur 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 audio-navigation unit or audio unit. The SVC comes from the factory with the MID setting as the default.
To change the audio unit SVC setting, press the tune folder sound knob repeatedly until the SVC is displayed, rotate the knob to adjust the SVC to the desired setting (SVC OFF, SVC LOW, SVC MID, or SVC 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
The navigation system allows voice control of the audio, XM, PC card, and CD player. Voice control commands are communicated on the GA-Net (audio 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.
USB Adapter
The audio-navigation unit or audio unit can play digital music from portable audio players, USB drive, etc. when the device is plugged into the USB adapter. The audio-navigation unit or audio unit uses the GA-Net to allow you to control the device from the audio-navigation unit or 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.
USB Function
Music files can be stored on portable USB devices (flash drives and approved iPod products) and played through the audio-navigation unit or audio unit by using the USB adapter. Although a customer can create many different folder levels on their USB device, the audio-navigation unit or audio unit only recognizes two levels and automatically sorts the music to meet this requirement.
To play the music files, use the TUNE/FOLDER button or knob 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 USB adapter control 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 USB adapter control unit's memory so when you reconnect the same USB device, the audio-navigation unit or audio 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 or audio 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.
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. Naturally 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.
System Diagram (with 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 the connector C, D, and H inputs and outputs.
Audio-navigation unit
AUDIO-NAVIGATION UNIT CONNECTOR A (24P)
Audio-Navigation Unit Connector A (24P) (with premium audio)
Audio-Navigation Unit Connector A (24P) (without premium audio)
AUDIO-NAVIGATION UNIT CONNECTOR B (24P)
Audio-Navigation Unit Connector B (24P)
AUDIO-NAVIGATION UNIT CONNECTOR E (14P)
Audio-Navigation Unit Connector E (14P)
AUDIO-NAVIGATION UNIT CONNECTOR G (3P)
Audio-Navigation Unit Connector G (3P)
Audio Unit Connector for Inputs and Outputs (without navigation)
With premium audio
Without premium audio
AUDIO UNIT CONNECTOR A (17P)
Audio Unit Connector A (17P) (with premium audio)
Audio Unit Connector A (17P) (without premium audio)
AUDIO UNIT CONNECTOR B (20P)
Audio Unit Connector B (20P)
AUDIO UNIT CONNECTOR E (14P)
Audio Unit Connector E (14P)
AUDIO UNIT CONNECTOR G (3P)
Audio Unit Connector G (3P)
Stereo Amplifier Connector for Inputs and Outputs (2-door with premium audio)
STEREO AMPLIFIER CONNECTOR A (20P)
Stereo Amplifier Connector A (20P)
STEREO AMPLIFIER CONNECTOR B (14P)
Stereo Amplifier Connector B (14P) (with navigation)
Stereo Amplifier Connector B (14P) (without navigation)
Stereo Amplifier Connector for Inputs and Outputs (4-door with premium audio)
STEREO AMPLIFIER CONNECTOR A (20P)
Stereo Amplifier Connector A (20P)
STEREO AMPLIFIER CONNECTOR B (14P)
Stereo Amplifier Connector B (14P) (with navigation)
Stereo Amplifier Connector B (14P) (without navigation)
XM Receiver Connector for Inputs and Outputs (with navigation)
XM RECEIVER CONNECTOR A (14P)
XM Receiver Connector A (14P)
XM RECEIVER CONNECTOR B (2P)
XM Receiver Connector B (2P)
USB Adapter Control Unit Connector for Inputs and Outputs
USB ADAPTER CONTROL UNIT CONNECTOR A (14P)
USB Adapter Control Unit Connector A (14P)
USB ADAPTER CONTROL UNIT CONNECTOR B (5P)
USB Adapter Control Unit Connector B (5P)
Auxiliary Jack Assembly Connector for Inputs and Outputs
AUXILIARY JACK ASSEMBLY 5P CONNECTOR
Auxiliary Jack Assembly 5P Connector (with navigation)
Auxiliary Jack Assembly 5P Connector (without navigation)
