Volume does not increase with speed (with navigation)
- Check the vehicle battery condition first (see 12 VOLT BATTERY TEST ).
- Check the connectors for poor connections or loose terminals.
- Verify SVC mode setting in the audio-navigation unit sound adjustment set-up.
Is the SVC set to off?
YES -Change the setting to MID, and recheck.
NO -Go to step 2.
- Enter the navigation diagnostic mode, and use the Car status diagnosis to check the vehicle speed pulse signal (see
CAR STATUS
).
Is there a vehicle speed signal OK?
YES -Substitute a known-good audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
NO -Go to step 3.
- Test-drive the vehicle at highway speeds, and monitor if the volume increases.
Does the volume increase?
YES -Intermittent failure, the system is OK at this time.
NO -Go to step 4.
- Turn the ignition switch to LOCK (0).
- Remove the audio-navigation unit (see
AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION
), and disconnect audio-navigation unit connector A (24P).NOTE:
- Eject all the discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the audio-navigation unit.
- Turn the ignition switch to ON (II).
- Drive the vehicle, and have an assistant measure the voltage at audio-navigation unit connector A (24P) terminal No. 23 and body ground.NOTE: Some voltmeters may show an average of 2.5 V, and others may show a constant voltage, depending on the meter's measurement speed.
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there a 0-5 V pulse or about 2.5 V average?
YES -Substitute a known-good audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
NO -Repair an open or a short in the wire between audio-navigation unit connector A (24P) terminal No. 23 and ECM/PCM connector A (44P) terminal No. 29. If no opens are found, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), and recheck. If the symptom/indication goes away, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ).