Audio Unit Button Does Not Work

Symptom Troubleshooting: Audio unit button does not work

Audio unit button does not work

NOTE: To troubleshoot the main power switch, go to Power switch will not turn on. Audio Unit Power Switch Will Not Turn On (No Information Display and No Sound)

1. Refer to the following switch list, and find the appropriate switch for each button. Then do the following exercise to identify the switch that does not work by operating various buttons that only belong to that switch.





2. Check to see if the buttons that do not function all belong to switch A.

Are they all switch A's?
YES - Substitute a known-good audio unit, and recheck. If the symptom/indication goes away, replace the original audio unit. Audio Unit Removal/Installation If the symptom is still present, substitute a known-good audio panel, and recheck. If the symptom/indication goes away, replace the original audio panel. Audio Unit Removal/Installation

NO - Go to step 3.


3. Check to see if the buttons that do not function belong to switch B.

Are they switch B's?
YES - Faulty audio-HVAC display panel and audio unit. Replace the audio-HVAC display module.

NO - Check the connections between the interface dial and audio panel, and recheck the function. If the symptom is still present, substitute a known-good audio unit and recheck. If the symptom/indication goes away, replace the original audio unit. Audio Unit Removal/Installation If the symptom is still present, substitute a known-good audio panel and recheck. If the symptom/indication goes away, replace the original audio panel. Audio Unit Removal/Installation