Honda Civic. Manual — part 114

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 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 causes audio and navigation functions to appear inoperative.

For vehicles with navigation, pressing the open/close switch on the navigation

scratched

Audio remote
switch does not
work properly

Symptom Troubleshooting (see AUDIO
REMOTE SWITCH DOES NOT WORK
PROPERLY)

Audio disc cannot
be inserted and/or
ejected (with
navigation)

Symptom Troubleshooting (see AUDIO
DISC CANNOT BE INSERTED AND/OR
EJECTED (WITH NAVIGATION))

Display can be
opened and/or
closed even when
an audio disc is
being inserted or
ejected

Replace the navigation unit (see
NAVIGATION UNIT
REMOVAL/INSTALLATION )

PC card will not
play/card icon on
audio screen
cannot be selected
(with navigation)

Symptom Troubleshooting (see AUDIO
DISC CANNOT BE INSERTED AND/OR
EJECTED (WITH NAVIGATION))

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Audio System - Civic (Except Hybrid)

display panel allows access to the CD slot and PC card.

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)

Some audio systems are equipped with speed-sensitive volume compensation
(SVC). The navigation 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 navigation 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, LOW, MID, or HIGH).

To change the 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).

Fig. 4: Speed-Sensitive Volume Compensation (SVC) Graph
Courtesy of AMERICAN HONDA MOTOR CO., INC.

The navigation system allows voice control of the audio, XM, PC card, and CD

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Audio System - Civic (Except Hybrid)

player. Voice control commands are 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 or route
guidance (RG), the front speakers give the navigation sound and the rear speakers
continue to play. For more information, see the NAVIGATION SYSTEM
(EXCEPT HYBRID) article. The outline of the interruption function is shown in
this table.

AUDIO OUTPUT AND CONTENTS REFERENCE

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.

Fig. 5: Audio System - Circuit Diagram (Navigation Unit, XM Receiver And
Music Link, CD Changer)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Contents

Audio output

Left front CH

Right front

CH

Right

rear CH

Left

rear

CH

Subwoofer

CH

TALK/BACK

Buttons

Navigation

voice output

Navigation

voice output

Muted

Muted

Muted

Route guidance

Navigation

voice output

Navigation

voice output

Audio

Audio

Audio

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Audio System - Civic (Except Hybrid)

With navigation

Fig. 6: Audio System - Circuit Diagram (With Navigation)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Audio Glossary

ITEM DEFINITION

NOTE:

All items may not apply to this vehicle. See the Owner's
Manual for more information.

Item

Definition

Active Noise

The active noise control system cancels some of the vehicle
noise. This occurs in the 1,500-2,400 rpm range.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Audio System - Civic (Except Hybrid)