Audio System Description

Overview

The Audio Unit acts as the ‘‘processor'' for all audio functions. Select audio functions from the front panel, the audio remote (on steering wheel), or by using the navigation voice control system. The audio display provides the current front audio status. For vehicles with the navigation option, additional audio information is available by touching the audio button on the Navigation Audio Screen (See the owner's manual and the navigation user's guide for more details.)

The navigation unit pass their signals to the audio unit. In addition they communicates with the audio unit via the GA-Net bus. Any open connection in the GA-Net bus circuit will cause audio and navigation functions to appear inoperative.

A Security signal is daisy-chained between the audio, and navigation components for integration into the vehicle's alarm system.
The optional navigation system provides voice control audio, and CD player. Voice control commands communicated on the GA-Net (audio unit). When using the talk/back button, the audio is muted on all speakers and you get navigation sound on the front channels. When using the navigation/route guidance (RG/HFT), the front speakers give the telephone sound and 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.

Contents	Audio output
Contents	Left front CH	Right front CH	Right rear CH	Left rear CH
Talk/back Buttons	Navigation voice output	Navigation voice output	Muted	Muted
Route guidance	Navigation voice output	Navigation voice output	Audio	Audio
HFT	Telephone voice output	Telephone voice output	Audio	Audio

GA-Net Bus Configuration

The GA-Net bus passes audio and navigation commands throughout the navigation and audio components.
These commands include navigation hard button signals, audio selection by voice, 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

**Audio Glossary**
Item	Definition
AM (Amplitude Modulation)	The type of transmission used in the standard radio broadcast band from 530 to 1705 kHz.
Amplifier	A device which increases the level of a signal by increasing the current or voltage.
Antenna	A device used to send or receive electromagnetic waves through the air.
Antenna module
Balance	A control that changes the relative volume of the left and right channels.
Band	A range of frequencies between two definite limits. Bands are assigned by the Federal Communications Commission for specific uses.
Bass	An adjustment for the low frequency sounds of around 160 Hz and below.
Byte	A unit of storage for computer files and memory. A CD holds approximately 700 million bytes.
Cassette	Audio or video magnetic tape container having two reels. Customers can insert it for recording or play back without handling the tape itself.
CD (Compact Disc)	A 4.5-inch plastic disc containing digital audio recording that is played optically on a laser equipped player. Never use discs with a paper label. In a hot car, labels can curl up and jam the unit.
CD Changer	CD player that can store and play more than one CD. Two types are available. Some units accept CDs fed into the changer one at a time, and others accept a magazine (with CD's stacked in a container).
CD player	A component designed to play compact disc CD recording using a laser optical pickup. The signal from a CD player usually requires amplification, which case the Auxiliary jacks can be used.
Distortion	Inexact reproduction of an audio signal caused by exceeding the specification of the speakers, or other audio components.
Dolby (noise reduction)	Processing system developed by Dolby Laboratories to reduce the noise inherent in recording media with minimal effect on the sound being recorded.
DVD (Digital Versatile Disc)	A 4.5-inch CD-like format used for storing movies with digital audio and video features. The DVD-A format is a DVD format designed for DVD audio systems. The vehicle's audio system will not play DVD or DVD-A formats.
Equalizer	A device that changes the relative volume of individual frequency bands to suit personal tasted of the listener.
Fader	The control that adjusts the relative volume levels of front and rear speakers in a four-speaker system.
Format	To prepare a PC Card to receive files. This function is performed on a PC. Always choose either FAT of FAT32 as the format type-NTSF format is not accepted by the system. Pick the default sectors for the format method selected.
FM (Frequency Modulation)	The from of modulation used for radio and television sound transmission in most of the world. Less prone to interference than AM. The FM broad cast band covers roughly 87 to 108 MHz.
GB (Gigabyte)	A unit of memory of disk storage equal to billion bytes (1000 million bytes).

**Audio Glossary**
Item	Definition
Hertz (HZ)	The unit of frequency equal to one cycle per second (cps). One kilohertz (kHz) equals 1,000 cps; one megahertz (MHz) equals 1 million cps.
Integrated Amplifier	A component that combines a pre amp and power amp in a single unit. An integrated amp combined with a tuner in a single unit is called a receiver.
Jewel Case	The hard plastic case that contains a compact disc or DVD. Always use a jewel case to prevent scratches on the underside of a CD or DVD.
LCD (Liquid Crystal Display)	A type of digital display made a material that changes reflectance or transmittance when an electrical field is applied to it. The audio system with navigation uses this is a display.
Mb (Megabyte)	A unit of memory or disc storage equal to 1 million bytes.
Memory	Circuitry or devices that hold information in electrical or magnetic from, such as the AM/FM radio presets.
Megabyte (M byte)	One million bytes. Written as 1Mb. Megabytes are used a measure of digital storage space. For example, a CD can hold 650 Mb.
Mic	An abbreviation for microphone. For vehicles with navigation, the microphone accepts. navigation voice commands to control audio and navigation functions.
Mute	When the navigation is giving guidance, the front speakers are muted (no music). When using the voice control system, all of the speakers are muted.
Noise	Unwanted random sounds of no specific frequency or amplitude such as buzzing, hiss, pops, static, whine, etc.
Processor	The part of an audio device that actually performs task/calculations. In the audio unit the processor handles muting to allow the navi to speak voice commands, and the decoding/playback of the sound files etc.
Radio	A head unit that combines a tuner, a preamplifier, and often a power-amplifier.
Radio Remote switch	The switches on the steering wheel that control the audio system.
SCF (Cold Start Fix) screens	There screens are displayed if the system requires a GPS initialization. The vehicle should be moved outside in an open area away from buildings/power lines.
Stereo	A recording of at least two channels where positioning of instrument sounds from left to right can be perceived.
Shield	A metallic foil or braided wire layer surrounding conductors which are designed to prevent electrostatic or electromagnetic interference (noise) from external sources such as buzzing, or popping sounds heated on the speakers.
Speaker (Loudspeaker)	A device that converts electrical energy into acoustical energy (sound).
Track	A sound recording on a CD, tape, or PC Card.
Treble	An adjustment to control the ‘‘volume'' of the high frequency sounds.
Tuner	A component (or part of component) that receives radio signals and selects one broadcast from many.
Tweeter	A speaker designed to reproduce the higher frequencies (treble) only.
Voice control	Coil of wore wrapped around a tube and attached to the speaker cone or driver diaphragm. Becomes an electromagnet when an audio signal is applied and interacts with a permanent magnet that causes the cone or diaphragm to vibrate.
Volume Control	A gain control of an amplifier resulting in the apparent loudness of the music.

Audio Unit Connector for Inputs and Outputs

When replacing an audio unit connecotr, match the wires to the cavities listed in the following table.

With navigation

Without navigation

Cavity	Wire	Connect to
A1	PUR	Dash lights brightness controller (ILL-)
A2	BRN	Left rear speaker (-)
A3	LT BLU	Left front door speaker (-), Left tweeter (-)
A4	BRN^*1	Navigation display (NAVI SCTY)
A4	GRN^*2	Multiplex integrated control unit (MICU) (SCTY RADIO)
A5	———	Not used
A6	LT BLU	Multiplex integrated control unit (MICU) (K-LINE)
A7	BRN	Right front door speaker (-), Right tweeter (-)
A8	ORN	Right rear speaker (-)
A9	BLK	Ground (G504)
A10	GRY	Lights-on signal
A11	YEL	Left rear speaker (+)
A12	LT GRN	Left front door speaker (+), Left tweeter (+)
A13	BLU	ECM (VSP)
A14	PUR	Multiplex integrated control unit (MICU) (ACC RADIO)
A15	GRY	Right front door speaker (+), Right tweeter (+)
A16	BLU	Right rear speaker (+)
A17	WHT	Multiplex integrated control unit (MICU) (+B BACK UP)

*1:	With navigation
*2:	Without navigation

Cavity	Wire	Connect to
B1	BLK^*	Navigation unit (RG GND)
B2	GRY^*	Navigation unit (RG SHIELD GND)
B3	———	Not used
B4	———	Not used
B5	———	Not used
B6	BRN	Radio remote switch (AUDIO REMOTE GND)
B7	PNK	Radio remote switch (AUDIO REMOTE SW)
B8	LT BLU^*	Hands Free Telephone control unit (HFT ICON)
B9	RED^*	Hands Free Telephone control unit (TELEM SIG-)
B10	GRY^*	Hands Free Telephone control unit (TELEM SIG SHIELD)
B11	WHT^*	Navigation unit (RG L+)
B12	RED^*	Navigation unit (RG R+)
B13	———	Not used
B14	———	Not used
B15	———	Not used
B16	———	Not used
B17	———	Not used
B18	———	Not used
B19	GRN^*	Hands Free Telephone control unit (TELEM SIG+)
B20	ORN^*	Hands Free Telephone control unit (HFT MUTE)

*:	With navigation

**With navigation**
Cavity	Wire	Connect to
C1	———	Not used
C2	———	Not used
C3	GRY	Navigation display (BUS (GA-NET) SHIELD GND)
C4	———	Not used
C5	———	Not used
C6	———	Not used
C7	———	Not used
C8	———	Not used
C9	BLU	Navigation display (ECU BUS+ (GA-NET))
C10	PNK	Navigation display (ECU BUS- (GA-NET))
C11	———	Not used
C12	———	Not used
C13	———	Not used
C14	———	Not used

Cavity	Wire	Connect to
D1	BRN	Audio-HVAC subdisplay unit (SUB DISP GND)
D2	PNK	Audio-HVAC subdisplay unit (SUB DISP 5 V)
D3	———	Not used
D4	YEL	Audio-HVAC subdisplay unit (SUB DISP RST)
D5	PUR	Audio-HVAC subdisplay unit (SUB DISP CLOCK)
D6	ORN	Audio-HVAC subdisplay unit (SUB DISP DATA)
D7	BLU	Audio-HVAC subdisplay unit (SUB DISP CE)
D8	GRY	Audio-HVAC subdisplay unit (SUB DISP SHIELD)
D9	PNK	Audio-HVAC subdisplay unit (SUB DISP LCD BL-)
D10	LT GRN	Audio-HVAC subdisplay unit (SUB DISP LCD BL+)

Cavity	Wire	Connect to
E1	BLU^*	Dash lights brightness controller (ILL-)
E2	GRY^*	Lights-on signal
E3	———	Not used
E4	RED	Climate control unit (DISP CLK)
E5	YEL	Climate control unit (AC SO)

*:	With navigation

Cavity	Wire	Connect to
F1	———	Antenna module (SIG)
F2	———	Antenna module (SHIELD (AM/FM))
F3	———	Antenna module (ANT +B)

Audio-HVAC Subdisplay Unit

When replacing an audio-HVAC subdisplay unit connector, match the wires to the cavities listed in the following table.

Cavity	Wire	Connect to
1	BRN	Audio unit (SUB DISP GND)
2	PNK	Audio unit (SUB DISP 5 V)
3	BLK	Ground (G503)
4	YEL	Audio unit (SUB DISP RST)
5	PUR	Audio unit (SUB DISP CLOCK)
6	ORN	Audio unit (SUB DISP DATA)
7	BLU	Audio unit (SUB DISP CE)
8	GRY	Audio unit (SUB DISP SHIELD)
9	PNK	Audio unit (SUB DISP LCD BL-)
10	LT GRN	Audio unit (SUB DISP LCD BL+)

Interface Dial

When replacing an interface dial connector, match the wires to the cavities listed in the following table.

**With navigation**
Cavity	Wire	Connect to
1	WHT	Navigation unit (JOG)
2	BLK	Navigation unit (JOG SHIELD)
3	BLK	Ground (G503)
4	PUR	Multiplex integrated control unit (MICU) (ACC RADIO)
5	———	Not used