Volume Does Not Increase With Speed (Without Navigation)

Audio System Symptom Troubleshooting - Volume does not increase with speed

Volume does not increase with speed (without navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.
- Set the fader and balance positions to the center.

1. 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 retest.�

NO -

Go to step 2.

2. Do the self-diagnostic function for the vehicle speed pulse indication.

Does the self-diagnostic function indicate a VSP signal when the vehicle is moving?

YES -

Substitute a known-good audio unit Audio Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal/Installation.�

NO -

Go to step 3.

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 -

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 Audio Unit Removal/Installation, and recheck. If the symptom goes away, replace the original audio unit Audio Unit Removal/Installation.�