Volume Does Not Change (With Navigation)

Volume Does Not Change (With Navigation)

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

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 KOhm -> infinity -> 1.0 KOhm -> infinity -> 1.0 KOhm

Does the resistance change as indicated?

YES - Replace the audio unit.

NO - Replace the audio-HVAC display panel.