Volume Does Not Increase With Speed (With Navigation)

Audio System Symptom Troubleshooting - Volume does not increase with speed

Volume does not increase with speed (with navigation)

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-navigation 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.

4. With the help of an assistant test-drive the vehicle, and watch the VSP signal.

Does self-diagnostic function indicate a VSP signal?

YES -

Substitute a known-good audio-navigation unit (including the HDD) Audio-Navigation Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original audio-navigation unit Audio-Navigation Unit Removal/Installation.

NO -

Go to navigation DTC 1306 (Vehicle Speed Pulse) troubleshooting 1306.