Volume Does Not Increase With Speed

Audio System Symptom Troubleshooting - Volume does not increase with speed

Volume does not increase with speed

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.

1. 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 2.

2. Verify SVC mode setting in audio unit sound adjustment set-up.

Is the SVC set to off?

YES -

Change setting to SVC MID, and recheck.

NO -

Go to step 3.

3. Do the Self-Diagnostic Function for the vehicle speed pulse indication Audio System Self-Diagnostic Function.

Does self-diagnostic function indicate a VSP signal?

YES -

Substitute a known-good audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation), and recheck.
If the symptom/indication goes away, replace the original audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).

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; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation), and recheck.
If the symptom/indication goes away, replace the original audio unit; with navigation Audio Unit Removal/Installation (With Navigation), without navigation Audio Unit Removal/Installation (Without Navigation).