Honda Civic. Manual — part 146

Do the volume increase?

YES -Intermittent failure, the system is OK at this time.

NO -Go to step 4.

4. Remove the navigation unit (see NAVIGATION UNIT

REMOVAL/INSTALLATION ), or audio unit (see AUDIO UNIT
REMOVAL/INSTALLATION), and disconnect the navigation, or audio unit
connector A (17P).

5. Drive the vehicle, and have an assistant measure voltage at navigation or audio

unit connector A (17P) terminal No. 13.

Fig. 125: Measuring Voltage At Navigation Or Audio Unit A (17P)
Connector Terminal
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there a 0- 5 V Pulse?

YES -

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

Without navigation: Replace the audio unit (see AUDIO UNIT

NOTE:

Eject all the discs before removing the audio unit or
navigation unit to prevent damaging the CD player's
load mechanism.

2008 Honda Civic LX

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

REMOVAL/INSTALLATION).

NO -Repair open or shorts in the wire between the navigation, or audio unit
connector A (17P) No. 13 terminal and the ECM/PCM connector A (44P) No.
29 terminal. If no opens or shorts are found, substitute a known-good
ECM/PCM and recheck. If the symptom/indication goes away, replace the
original ECM/PCM . See ECM/PCM REPLACEMENT .

VOLUME IS TOO HIGH OR TOO LOW WHEN DRIVING AT FREEWAY SPEEDS

1. Test-drive the vehicle at highway speeds and monitor volume level.

Is the volume level too high, or too low?

YES -Go to step 2.

NO -Intermittent failure, the system is OK at this time.

2. Change the SVC mode setting in sound set-up to Mid (see SYSTEM

DESCRIPTION).

Is the volume level still too high, or too low?

YES -

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

Without navigation: Replace the audio unit (see AUDIO UNIT
REMOVAL/INSTALLATION).

NO -Improper SVC setting for customers sound taste.

DISPLAY DOES NOT DIM OR BRIGHTEN WITH DIMMER (WITHOUT NAVIGATION)

NOTE:

Check the vehicle battery condition first.

Check the connectors for poor connections or loose
terminals.

2008 Honda Civic LX

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

1. Turn the ignition switch to ON (II).
2. Turn the combination light switch ON and LOCK (0) to see if the symptom

can be duplicated.

Is it duplicated?

YES -Go to step 3.

NO -Operation is normal.

3. Turn the combination light switch OFF.
4. Operated the illumination control dial.

Is it normal?

YES -Operation is normal.

NO -Go to step 5.

5. Disconnect and check audio unit connector A (17P) for loose or a poor

connection.

Reconnect audio unit connector A (20P) and recheck the symptom; does it still
appear?

YES -Go to step 6.

NO -Operation is normal.

NOTE:

Check the vehicle battery condition first.

Check the connectors for poor connections or loose
terminals.

If the vehicle is equipped with navigation, refer to
DISPLAY DAY/NIGHT MODE DOES NOT WORK .

NOTE:

Eject all the discs before removing the audio unit to
prevent the CD player's load mechanism.

2008 Honda Civic LX

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

6. Turn the ignition switch to LOCK (0).
7. Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION).
8. Turn the ignition switch to ON (II).
9. Measure the voltage between audio unit connector A (17P) No. 1 and No. 10

terminals. Operate the dash brightness controller buttons to see if the voltage
changes.

Fig. 126: Measuring Voltage Between Audio Unit A (17P) Connector
Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Does the voltage change?

YES -Substitute a known-good audio unit, and recheck. If the
symptom/indication goes away, replace the original audio unit. If symptom is
still present, substitute a known-good center panel display and recheck. If the
symptom/indication goes away, replace the original center panel display (see
AUDIO UNIT REMOVAL/INSTALLATION).

NO -Repair open in the wire between the under-dash fuse/relay box and the
gauge control module.

Special Tools Required

Diagnostics CD 07AAZ-SDBA100

AUDIO DISC DOES NOT PLAY

2008 Honda Civic LX

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