Volume Does Not Increase With Speed (With Navigation)
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 Mid, and recheck. Description and Operation
NO - Go to step 3.
3. Do the Self-diagnostic Function for the vehicle speed pulse indication. How To Troubleshoot The Audio System (Without Navigation)
Does the self-diagnostic function indicate a VSP signal?
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. 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.
- Remove the PC card before removing the audio-navigation unit.
5. Drive the vehicle, and have an assistant measure the voltage at audio-navigation unit connector A (24P) terminal No. 15.
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 a short in the wire between the audio-navigation unit connector A (24P) terminal No. 15 and the ECM/PCM connector A (44P) terminal No. 29. If no opens or shorts are found, update the ECM/PCM; R18A1 engine, ECM/PCM Update K20Z3 engine ECM/PCM Update if it does not have the latest software, or substitute a known-good ECM/PCM; R18A1 engine, Reading and Clearing Diagnostic Trouble Codes K20Z3 engine. Reading and Clearing Diagnostic Trouble Codes
