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 Testing and Inspection.
- 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 the SVC mode setting in the audio-navigation unit sound set-up.

Is the SVC set to off?

YES -

Change the setting to SVC MID, and recheck.�

NO -

Go to step 3.

3. Go into the navigation System Diagnostic Mode, and use the Car Status diagnosis to check the vehicle speed pulse signal.

Is the vehicle speed signal OK?

YES -

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

NO -

Go to step 4.

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

5. Remove the audio-navigation unit Audio-Navigation Unit Removal/Installation (With Navigation) and disconnect audio-navigation unit connector A (24P).

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

6. Drive the vehicle have an assistant, and measure the voltage between audio-navigation unit connector A (24P) terminal No. 15 and body ground.





Is there a 0-5 V Pulse?

YES -

Replace the audio-navigation unit Audio-Navigation Unit Removal/Installation (With Navigation).�

NO -

Repair an open or shorts in the wire between audio-navigation unit connector A (24P) terminal No. 15 and PCM connector E (31P) terminal No. 26. If no opens or shorts are found, update the PCM ECM/PCM Update if it does not have the latest software, or substitute a known-good PCM.�