Volume Does Not Increase With Speed
- Check the vehicle battery condition first, (see BATTERY TEST )
- Check the connectors for poor connections or loose terminals.
- Set the fader and balance positions to the center.
- Check the SVC mode setting in the audio-navigation unit or audio unit sound set-up.
Is the SVC set to off?
YES - Change the setting to at least the MID setting, and retest.
NO
- With navigation: Go to step 2
- Without navigation: Go to step 3
- Do the System Diagnostic Mode of Navigation System for the vehicle speed pulse indication (VSP) in the Car status. (See START-UP PROCEDURE AND DIAGNOSTIC MENU
).
Does the Car Status indicate a VSP signal when the vehicle is moving?
YES - Substitute a known-good navigation or audio unit and retest. If the symptom/indication goes away, replace the original navigation or audio unit. (See AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
NO - Go to step 4.
- Do the self-diagnostic function for the vehicle speed pulse indication (VSP) (see
SELF-DIAGNOSTIC FUNCTION )..
Does the self-diagnostic function indicate a VSP signal when the vehicle is moving?
YES - Substitute a known-good audio unit and retest. If the symptom/indication goes away, replace the original audio unit (see AUDIO UNIT REMOVAL/INSTALLATION )
NO - Go to step 4.
- Test-drive the vehicle at highway speeds, and monitor if the volume increases with speed.
Does the volume increase?
YES - Intermittent failure, the system is OK at this time.
NO - Go to step 5
- Remove the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ) or the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and disconnect the navigation or audio unit connector A (24P).
- Raise the vehicle on a lift.
- Turn the ignition switch to ON (II).
- Press the brake pedal, and shift the transmission to N.
- Slowly spin one of the front wheels by hand, and have an assistant measure the voltage at navigation or audio unit connector A (24P) terminal No. 15.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there a 0 -5 V pulse?
YES -
- With navigation: Replace the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
- Without navigation: Replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
NO - Repair an open or short in the wire between the navigation or audio unit connector A (24P) terminal No. 15 and the ECM/PCM connector A (44P) terminal No. 30. If no open or short is found, substitute a known-good ECM/PCM, and recheck. If the symptom/indicated goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).