Volume Does Not Change

Audio System Symptom Troubleshooting - Volume does not change

Volume does not change

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.
- Set the fader and the balance positions to the center.

1. Turn the ignition switch to ON (II).

2. Turn on the audio unit, and check for sound in each mode (AM, FM, XM, and CD).

Is the sound normal?

YES -

Go to step 3.

NO -

Go to audio system sound is weak or distorted, or no sound is heard from the speaker(s) with ELS audio system No Sound is Heard From the Speaker(s) (Display is Normal), with premium audio system No Sound is Heard From the Speaker(s) (Display is Normal).�

3. Operate the volume knob to see if the volume changes.

Does the volume change?

YES -

Operation is normal at this time.�

NO -

- With ELS audio system: Substitute a known-good audio unit Audio Unit Removal/Installation (With Navigation System), and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal/Installation (With Navigation System).�
- With premium audio system: Go to step 4.

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

5. Disconnect audio switch panel connector B (5P) and audio unit connector C (28P).

6. Check for continuity between audio switch panel connector B (5P) terminals and audio unit connector C (28P) terminals according to the table.









Is there continuity?

YES -

Go to step 7.

NO -

There is an open in the wire(s) between the audio unit and the audio switch panel. Replace the affected shielded harness. Replace the affected shielded harness.�

7. Check for continuity between audio switch panel connector B (5P) terminals and body ground as shown.





Is there continuity?

YES -

There is a short to body ground in the wire(s) between the audio unit and the audio switch panel. Replace the affected shielded harness.�

NO -

Go to step 8.

8. Check for continuity between the terminals of audio switch panel connector B (5P) according to the table.









Is there continuity between any of the terminals?

YES -

There is a short in the wire(s) between the audio unit and the audio switch panel. Replace the affected shielded harness.�

NO -

Substitute a known-good audio unit Audio Unit Removal/Installation (Without Navigation System), and recheck. If the symptom/indication goes away, replace the original audio unit. If the symptom is still present, substitute a known-good audio switch panel Audio Switch Panel Removal/Installation (Without Navigation System), and recheck. If the symptom/indication goes away, replace the original audio switch panel.�