Volume Does Not Increase With Speed

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Check the vehicle battery condition first.
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 unit sound set-up.
Is the (SVC) set to off?

YES - Change the setting to at least the Mid setting, and reset ■

NO - Go to step 2.
Do the self-diagnostic function for the vehicle speed pulse indication (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 (see AUDIO UNIT REMOVAL/INSTALLATION ), and retest. If the symptom/indication goes away, replace the original audio unit. ■

NO -
- 1 CD type: Go to step 3.
- Except 1 CD type: Check for B-CAN DTCs (communication BUS Line Error) with the HDS and go to the indicated DTC's troubleshooting. If no B-CAN DTCs or communication bus line errors are found, substitute a known-good audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom goes away, replace the original audio unit.
Remove the audio unit, (see AUDIO UNIT REMOVAL/INSTALLATION )
NOTE: Eject all the CDs before removing the audio unit to prevent damaging the CD player's load mechanism.
Turn the ignition switch to ON (II).
Test-drive the vehicle very slowly and have an assistant measure the voltage at audio unit connector A (24P) terminal No. 15.
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.

Is there a 0-5 V pulse or about 2.5 V average?

YES - Substitute a known-good audio unit, and recheck (see AUDIO UNIT REMOVAL/INSTALLATION ). If the symptom/indication goes away, replace the original audio unit. ■

NO - Repair opens or shorts in the wire between the audio unit connector A (24P) terminal No. 15 and the PCM connector A (49P) terminal No. 30. If no opens or shorts are found, substitute a known-good audio unit, and recheck (see AUDIO UNIT REMOVAL/INSTALLATION ). If the symptom/indication goes away, replace the original audio unit. If the symptom does not go away, update the PCM (see PCM UPDATE ) if it does not have the latest software or substitute a known-good PCM (see PCM REPLACEMENT ). ■

Fig 1: Measuring Voltage Audio Unit Connector A (24P) Terminal No. 15
Courtesy of AMERICAN HONDA MOTOR CO., INC.