Volume Does Not Change

Special Tools Required
- Radio test harness breakout box 07AAZ-SDAA100
- Radio test harness 070AZ-SEAA200

Volume does not change

1. Set the fader and balance position to the center.
2. Operate the volume knob to see if the volume changes accordingly.

Does it change?

YES - Operation is normal.

NO - Go to step 3.

3. Operate the volume knob to see if the LCD display changes accordingly.

Does it change?

YES - Replace the audio unit.

NO - Go to step 4.

4. Remove the audio unit.
5. Connect the test harness (070AZ-SEAA200A with navigation or 070AZ-SEAA200B without navigation) to radio test harness breakout box (07AAZ-SDAA100).







6. Connect the test harness (070AZ-SEAA200A with navigation or 070AZ-SEAA200B without navigation) to the printed circuit board.
7. Connect the ohm meter to the special tool (07AAZ-SDAA100) GND terminal one lead and VOL-A and VOL-B terminals with the other.
8. Turn the volume knob clockwise one click at a time. The resistance should change as follows with each turn of the knob:

100 ohms -> infinity -> 100 ohms -> infinity -> 100 ohms

Does the resistance change as indicated?

YES - Replace the audio unit.

NO - Replace the audio-HVAC display panel.