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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 article 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.
It also has a built-in diagnostic function that displays system failures on the LCD display (see SELF-DIAGNOSTIC FUNCTION ).
The system includes speed-sensitive volume compensation (SVC). This function adjusts the audio system automatically in proportion to the vehicle speed. The volume gain can be adjusted in three stages.
A security signal is daisy-chained between the audio and vehicle components, and are integrated into the vehicle's alarm system.
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When replacing an audio unit connector, match the wires to the cavities listed in the following table.
Scheme 5
AUDIO UNIT CONNECTOR A (17P)
| Cavity | Wire | Connect to |
|---|---|---|
| A1 | RED | Dash lights brightness controller |
| A2 | BLU/BLK | Left rear speaker (-) |
| A3 | LTGRN | Left front door speaker (-), Left tweeter (-) |
| A4 | BRN | Security control unit (SCTY RADIO) |
| A6 | RED/WHT | Data link connector (K-LINE) |
| A7 | GRY/RED | Right front door speaker (-), Right tweeter (-) |
| A8 | BLU/YEL | Right rear speaker (-) |
| A9 | BLK | Ground (G401) |
| A10 | REP/BLK | Lights-on signal |
| A11 | BLU/WHT | Left rear speaker (+) |
| A12 | GRN/BLK | Left front door speaker (+), Left tweeter (+) |
| A13 | PUR/WHT | ECM/PCM (VSP) |
| AH | YEL/RED | No. 26 (7.5 A) fuse in the under-dash fuse/relay box (ACC RADIO) |
| A15 | GRN/YEL | Right front door speaker (+), Right tweeter (+) |
| A16 | PNK | Right rear speaker (+) |
| A17 | WHT/RED | No. 8 (10 A) fuse in the under-food fuse/relay box (+B BACK UP) |
AUDIO UNIT CONNECTOR A (17P)
AUDIO UNIT CONNECTOR B (20P)
| Cavity | Wire | Connect to |
|---|---|---|
| B3 | GRN | Auxiliary jack assembly (AUX SIG GND) |
| B4 | BLK (1) | Auxiliary jack assembly (AUX SHIELD GND) |
| B5 | BLU | Auxiliary jack assembly (AUX GND) |
| B13 | WHT | Auxiliary jack assembly (AUX L) |
| B14 | RED | Auxiliary jack assembly (AUX R) |
| B15 | YEL | Auxiliary jack assembly (AUX DET) |
| (1) The shielded wires have a heat-shrunk tube insulating the outside of the wire. The color of the insulating tube, typically black or dark gray, may not match the color of the wire listed on the schematic. | ||
| (1) | The shielded wires have a heat-shrunk tube insulating the outside of the wire. The color of the insulating tube, typically black or dark gray, may not match the color of the wire listed on the schematic. |
AUDIO UNIT CONNECTOR B (20P)
AUDIO UNIT CONNECTOR C (3P)
| Cavity | Wire | Connect to |
|---|---|---|
| C1 | AM/FM Antenna amplifier | |
| C2 | AM/FM Antenna amplifier | |
| C3 | AM/FM Antenna amplifier |
AUDIO UNIT CONNECTOR C (3P)
Scheme 6
| Cavity | Wire | Connect to |
|---|---|---|
| 1 | YEL | Audio unit (AUX DET) |
| 2 | BLU | Audio unit (AUX GND) |
| 3 | GRN | Audio unit (AUX SIG GND) |
| 4 | WHT | Audio unit (AUX L) |
| 5 | RED | Audio unit (AUX R) |
INPUTS AND OUTPUTS DESCRIPTION
Note. All items may not apply to this vehicle. See the Owner's article for more information.
Audio Glossary
| Item | Definition |
|---|---|
| Active Noise Control | The active noise control system cancels some of the vehicle noise. This occurs in the 1,500-2,400 rpm range. Microphones detect the low frequency sound, and the system outputs a canceling sound from the audio speaker. |
| AM (Amplitude Modulation) | The type of transmission used in the standard radio broadcast band from 530 to 1,705 kHz. |
| Amplifier | A device that 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. |
| ATA (PC Card) | A type of card that has been tested for use in playing WMA, and MP3 music files in the PC card slot. Sizes of up to 1 GB have been tested. |
| Auxiliary jack | Allows the customer to use a portable audio device to input music recordings. |
| Audio Remote switch | The switches on the steering wheel that control the audio system. |
| 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. |
| Compact Flash | A standard for small-size (3x4 cm), memory cards used in mobile computers, PDAs, digital cameras. Compact flash memory cards are available in size of 32 MB up to 4 GB or more and can be played in the audio PC slot. Sizes above 1 GB has not been tested. |
| 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 (audio disc) 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. |
| Distortion | Inexact reproduction of an audio signal caused by playing music at levels the audio system cannot handle. |
| Dolby (noise reduction) | A processing system developed by Dolby Laboratories that reduces the background noise on recording media. The result is a clearer playback from the audio system. |
| 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. Some vehicles can play DVD and DVD-A formats. |
| Equalizer | A device that changes the relative volume of individual frequency bands to suit personal tastes 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 or FAT32 as the NTFS format is not accepted by the system. Pick the default sectors for the format method selected. |
| FM (Frequency Modulation) | The 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. |
| GA-Net | The GA-Net allows the audio unit to communicate with all the audio and navigation components in a vehicle. If there is an open in the GA-Net, components or the entire audio and navigation system may appear inoperative. |
| GB (Gigabyte) | A unit of memory or disk storage equal to billion bytes (1000 million bytes). |
| HDD | Abbreviation for hard disc drive. They are sensitive to heat and it is not recommended that they be used in the PC card slot for playing audio files. |
| 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 a power amp into a single unit. A receiver combines an integrated amp and a tuner into a single unit. |
| 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 that changes reflectance or transmittance when an electrical field is applied to it. |
| Memory | Circuitry or devices that hold information in electrical or magnetic form, such as the AM/FM radio presets. |
| MB (Megabyte) | One million bytes. Written as 1 MB. Megabytes are used s 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. |
| MP3 music files | MP3 is an audio coding format. MP3 is a poplar audio compression format on the Internet and computers. CDs, and PC card with these files can be played on some vehicle's audio system. |
| Mute | When the navigation gives guidance, the front speakers are muted (no music). When you use the voice control system, all of the speakers are muted. |
| Noise | Unwanted random sounds like buzzing, hiss, pops, static, whine, etc. |
| PC Card | The slot used for playing MP3 and WMA music files. The PC card is usually a combination of a small flash card in a PCMCIA adaptor that slides into the slot. The ATA, SD, and compact flash types of cards have been tested up to 1 GB. |
| PCMCIA | A computer standard for the slot that the PC card slides into. Another term for the PC card slot. |
| Processor | The part of an audio device that 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. |
| SCF (Cold Start Fix) screens | These screens are displayed if the system requires a GPS initialization. The vehicle should be moved outside into an open area away from buildings/power lines. |
| SD (Secure Digital) card | This compact type of memory card allows for fast data transfer and has built-in security functions. SD cards have a small write-protection switch on the side. |
| 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 heard on the speakers. |
| Speaker (Loudspeaker) | A device that converts electrical energy into acoustical energy (sound). |
| Stereo | A recording of at least two channels where you can hear sound or music from the left or right side. |
| Speed-sensitive Volume Compensation (SVC) | The SVC increases the audio volume to compensate for increased interior noise when the vehicle drives at freeway speeds. |
| Subwoofer | A loudspeaker made to reproduce the lowest audio frequencies, approx 25 Hz to 125 Hz. |
| 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 a component) that receives radio signals and selects one broadcast from many. |
| Tweeter | A speaker designed to reproduce the higher frequencies (treble) only. |
| Voice Coil | A coil of wire wrapped around a tube and then attached to the speaker cone or diaphragm. When an audio signal is applied, the coil becomes an electromagnet and interacts with the permanent magnet causing the cone or diaphragm to vibrate. We interpret this vibration as sound. |
| Volume Control | Allows you to control the loudness of the music. |
| WMA music file | Windows Media Audio File. This is an accepted format for music files to be played on either a CD or a PC card. |
| Woofer | A speaker that is designed to reproduce bass frequencies only. |
| XM Radio | Satellite based radio transmission, which also uses a ground based repeater network to ensure seamless reception. The channels originate from XM's broadcast center, in Washington, DC, and uplink to two satellites. These satellites transmit the signal across the entire continental United States. |
| XM Receiver | The external component that receives and processes the XM signals from the XM satellites, and terrestrial (land) stations. The audio unit communicates to the XM receiver over the GA-Net bus. |
AUDIO GLOSSARY
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See also:
• CENTER CONSOLE REMOVAL/INSTALLATION