Volume Does Not Increase With Speed (Without Navigation)

Audio System Symptom Troubleshooting - Volume does not increase with speed (without navigation)

Volume does not increase with speed (without navigation)

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.

1. Verify the SVC mode setting in the navigation or audio unit sound adjustment set-up.

Is the SVC set to off?

YES -

Change the setting to Mid Description and Operation, and reset.�

NO -

Go to step 2.

2. Do the self-diagnostic function for the vehicle speed pulse indication Initial Inspection and Diagnostic Overview.

Does the self-diagnostic function indicate a VSP signal?

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 -

Go to step 4.

4. Turn the ignition switch to LOCK (0).

5. Remove the audio unit Audio Unit Removal/Installation, and disconnect the audio unit connector A (17P).

NOTE: Eject all discs before removing the audio unit to prevent damaging the CD player's load mechanism.

6. Turn the ignition switch to ON (II).

7. Drive the vehicle, and have an assistant measure the voltage at audio unit connector A (17P) terminal No. 13 and body ground.





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

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 -

- '07-09 models: Repair an open or a short in the wire between audio unit connector A (17P) terminal No. 13 and PCM connector A (44P) terminal No. 29. If no open are found, substitute a known-good PCM Initial Inspection and Diagnostic Overview, and recheck. If the symptom/indicated goes away, replace the original PCM.�
- '10 model: Repair an open or a short in the wire between audio unit connector A (17P) terminal No. 13 and PCM connector A (49P) terminal No. 30. If no open are found, substitute a known-good PCM Initial Inspection and Diagnostic Overview, and recheck. If the symptom/indicated goes away, replace the original PCM Service and Repair.�