Volume Does Not Increase With Speed
Symptom Troubleshooting: Volume does not increase with speed
Volume does not increase with speed
NOTE:
- Check the vehicle battery condition first.
- Check the connectors for poor connection 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 unit sound adjustment set-up.
Is the SVC set to off?
YES - Change setting to Mid and retest.
NO - Go to step 3.
3. Do the self-diagnostic function for the vehicle speed pulse indication. How to Troubleshoot the Audio System
Does self-diagnostic function indicate a VSP signal?
YES - Substitute a known-good audio unit with ELS audio system, Audio Unit Removal/Installation (USA models with Navigation) with premium audio system, Audio Unit Removal/Installation (With Premium Audio System) and recheck. If the symptom/indication goes away, replace the original audio unit with ELS audio system, Audio Unit Removal/Installation (USA models with Navigation) with premium audio system. Audio Unit Removal/Installation (With Premium Audio System)
NO - Go to step 4.
4. Turn the ignition switch to LOCK (0).
5. Remove the audio unit, with ELS audio system, Audio Unit Removal/Installation (USA models with Navigation) with premium audio system, Audio Unit Removal/Installation (With Premium Audio System) and disconnect audio unit connector A (17P).
NOTE: Eject all the CDs before removing the audio unit and CD changer 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.
Is there 0-5 V pulses?
YES - Substitute a known-good audio unit with ELS audio system, Audio Unit Removal/Installation (USA models with Navigation) with premium audio system, Audio Unit Removal/Installation (With Premium Audio System) and recheck. If the symptom/indication goes away, replace the original audio unit with ELS audio system, Audio Unit Removal/Installation (USA models with Navigation) with premium audio system. Audio Unit Removal/Installation (With Premium Audio System)
NO - Repair opens or shorts in the wire between audio unit connector A (17P) terminal No. 13 and PCM connector A (44P) terminal No. 29. If no opens or shorts are found, substitute a known-good PCM, Service and Repair and recheck. If the symptom/indicated goes away, replace the original PCM. Service and Repair
