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.
Do 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 Description and Operation.�
NO -
Go to step 3.
3. Do the Self-Diagnostic Function for the vehicle speed pulse indication Audio System Self-Diagnostic Function.
Does the self-diagnostic function indicate a VSP signal?
YES -
Substitute a known-good audio-navigation unit 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 step 4.
4. Remove the audio-navigation unit Audio-Navigation Unit Removal/Installation, 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.
- Remove the PC card before removing the audio-navigation unit.
5. Drive the vehicle and have an assistant, 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.�
NO -
Repair an open or short in the wire between audio-navigation unit connector A (24P) terminal No. 15 and PCM connector A (44P) terminal No. 29. If no opens or shorts are found, Update the PCM PCM Update if it does not have the latest software, or substitute a known-good PCM Initial Inspection and Diagnostic Overview.�