Volume Does Not Change (With CD Changer)

Special Tools Required
- Radio test harness breakout box 07AAZ-SDAA100
- Test harness (Stanley) 070AZ-SDAA200

Volume does not change (with CD changer)

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-SDAA200) to the radio test harness breakout box (07AAZ-SDAA100).




6. Connect the special tool (070AZ-SDAA200) connectors to the printed circuit board connector.
7. Connect the ohm meter to the special tool (070AZ-SDAA200 adapter) GND terminal and VOL-A terminal.
8. Turn the volume knob clockwise one click at a time. The resistance should change as follows with each turn of the knob:

0 KOhm -> infinity -> 0 KOhm -> infinity - >0 KOhm

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 special tool (070AZ-SDAA200 adapter) GND terminal and VOL-B terminal.
10. Turn the volume knob clockwise one click at a time. The resistance should change as follows with each turn of the knob:

0 KOhm -> infinity -> 0 KOhm -> infinity - >0 KOhm

Does the resistance change as indicated?

YES - Replace the audio unit.

NO - Replace the audio-HVAC display panel.