Volume Does Not Change (With Navigation)

Special Tools Required
- Radio test harness breakout box 07AAZ-SDAA100
- Test harness A&B (Alpine) 070AZ-SDAA100

Volume does not change (with navigation)

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 test harness (070AZ-SDAA100) test harness A to radio test harness breakout box (07AAZ-SDAA100).




6. Connect the test harness (070AZ-SDAA100) PTN-1 (A) connector to the printed circuit board connector,
7. Connect the ohm meter to the breakout box (07AAZ-SDAA100) GND terminal and VOL+ terminal.
8. Turn the volume knob clockwise one click at a time. The resistance should change as follows with each turn of the knob:
1.0 Ohm ->infinity -> 1.0 Ohm, -> infinity-> 1.0 Ohm,

Does the resistance change as indicated?

YES - Go to step 9.

NO - Replace the audio-HVAC display panel.




9. Connect the ohm meter to the breakout box (07AAZ-SDAA100) GND terminal and VOL- terminal.

10. Turn the volume knob clockwise one click at a time. The resistance should change as follows with each turn of the knob:
1.0 k Ohm -> infinity -> 1.0 k Ohm ->infinity-> 1.0 k Ohm

Does the resistance change as indicated?

YES - Replace the audio unit.

NO - Replace the audio-HVAC display panel.