Symptom Troubleshooting

Symptom Troubleshooting: Volume does not increase with speed

Volume does not increase with speed (with navigation)

NOTE:

- Check the vehicle battery condition first.

- Check the connectors for poor connections or loose terminals.

1. 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 retest.

NO - Go to step 2.


2. Do into the navigation diagnostic mode, and use the Car status diagnosis to check the vehicle speed pulse signal. Navigation System Diagnostic Mode (With Navigation)

Is the vehicle speed signal OK?
YES - Substitute a known-good audio-navigation unit, Audio-Navigation Unit Removal/Installation (With Navigation) and retest. If the symptom/indication goes away, replace the original audio-navigation unit.

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-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, and have an assistant measure 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 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, replace the PCM. Service and Repair