Radio, Stereo, and Compact Disc: Description and Operation

Audio System Description

Overview

The audio unit or audio-navigation unit acts as the processor for all audio functions. Select audio functions from the audio unit or audio-navigation unit, the audio remote switch (on the steering wheel), or by using the navigation voice control system (with navigation). 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 screen (see the owner's manual and the navigation manual for more details.).

The audio system is equipped with an auxiliary input jack (AUX) in the audio unit (without navigation), or in the dashboard center lower cover (with navigation). The system accepts auxiliary audio inputs using a 3.5 mm stereo miniplug.

The audio unit or audio-navigation 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 12 volt battery is disconnected.

For vehicles with navigation, pressing the open/close button on the navigation display allows access to the CD slot, the PC card slot, and the navigation DVD.

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

Speed-Sensitive Volume Compensation (SVC)

The audio system is 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 sound () button repeatedly until the SVC is displayed, and rotate the VOL/SELECT 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 (SVC OFF, LOW, MID, or HIGH).

Radio Data System (RDS)

On the FM band, you can select a favorite station and display the program service name provided by the radio data system (RDS).

Program Service (PS) Name Display

The program service name display function shows the name of the station you are listening to. You can turn this function on or off.

Rear Antenna Ground

All models are equipped with the rear antenna ground attached to the upper rear window that is connected to the body ground. This antenna ground prevents the electromagnetic waves that are created the IMA system from interfering with the reception of the AM/FM radio frequencies.

Muting Logic

The navigation system allows voice control of the audio, the PC card, and the CD player. Voice control commands are communicated on the GA-Net. 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 the audio unit can play digital music from portable audio players, USB drives, etc. when the device is plugged into the USB port. The audio-navigation unit or the audio unit uses the GA-Net to allow you to control the device from the audio-navigation unit or 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.

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. 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.

Anti-Theft Feature

With navigation

The audio-navigation 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) and C (8P).
- Removing the No. B1 (15 A) fuse from the under-dash fuse/relay box.

When the audio-navigation unit is reconnected to the power and the ignition switch is turned to ON (II), CODE appears on the display. Enter the 4-digit anti-theft security code.

If the code cannot be found, use the interactive Network (iN) to look it up. You can view the serial number in the ECU Info diagnostic screen. Alternatively, you can find the serial number on the underside label which is located on the audio-navigation unit in the dash.

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

If you cannot find the code, refer to the Anti-Theft Feature in the navigation section on how to retrieve the code using the iN.

Without navigation

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. B1 (15 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), CODE appears on the display. Enter the 5-digit anti-theft security code.

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

If you cannot find the code, refer to the Self-Diagnosis Function Audio System Self-Diagnostic Function on how to retrieve the code using the iN.

Basic Audio Operation

- When you press the VOL/SELECT button, the mode changes to the SELECT mode. When you are in the SELECT mode, use the following buttons or knob to navigate through the various audio inputs.

- When any other button is pressed, the SELECT mode is canceled, and the audio unit changes per the button pressed.

- When you are in the SELECT mode, the selected radio station or music file continues playing until you select a new input or file (for example, you can listen to the radio until you find the song you wish to play on the CD).

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 the audio unit by using the USB port. Although a customer can create many different folder levels on their USB device, the audio-navigation unit or 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 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 meets 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 or the audio unit software is constantly updated.

The audio-navigation unit or the audio unit displays the folder differently than what you may see on your PC because the audio-navigation unit or the audio unit only recognizes two folder levels. The audio-navigation unit or 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 disc 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-navigation unit's or the audio unit's memory so when you reconnect the same USB drive, the audio-navigation unit or 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

USB with Audio Units

When you plug in a USB drive, the audio 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.

The audio unit organizes the music folders and files in a similar matrix that appears on the USB drive. The exception to this matrix is music files that are not located in a folder. The audio unit automatically creates a folder titled ROOT or FOLDER 01 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 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-navigation 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-navigation 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 with Audio Unit

When an iPod is connected to the audio unit with the USB port, 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.

The AUX terminal is a sound input terminal. When you connect an iPod to the audio unit using the AUX terminal, the audio unit cannot control the iPod except for the volume control. To select and play songs, use the iPod's controls.

Because hardware and software continually change, make sure the iPod is compatible with the vehicle by referring to the applicable owner's manual.

iPod Operation with Audio-Navigation Unit

When an iPod is connected to the audio-navigation unit with the USB port, you can navigate through the iPod's music files with the joystick and the key on the audio-navigation unit. You cannot use the iPod's controls.

The AUX terminal is a sound input terminal. When you connect an iPod to the audio-navigation unit using the AUX terminal, the audio-navigation unit cannot control the iPod except for the volume control. To select and play songs, use the iPod's controls.

Because hardware and software continually change, make sure the iPod is compatible with the vehicle by referring to the applicable owner's manual.

System Diagram

With navigation

Without navigation (Separate stereo amplifier type)

Without navigation (Built-in stereo amplifier type)

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 (Audio-navigation unit)

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

AUDIO-NAVIGATION UNIT CONNECTOR A (24P)