Description

Audio unit internal malfunction

Detection condition

Communication error between the audio unit and audio panel

Possible cause

• Audio panel malfunction

• Audio unit malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

INSPECT AUDIO PANEL

• Launch the switch inspection mode.

  (See DIAGNOSTIC ASSIST FUNCTION [AUDIO].)

• Does the buzzer sound when a switch is pressed?

Yes

Go to Step 3.

No

Replace the audio panel, then go to the next step.

(See AUDIO UNIT REMOVAL/INSTALLATION.)

2

VERIFY TROUBLESHOOTING COMPLETED

• Clear the DTC from the audio unit memory.

  (See CLEARING DTC [AUDIO].)

• Perform the audio unit DTC inspection.

  (See DTC INSPECTION [AUDIO].)

• Is the same DTC displayed?

Yes

Replace the audio panel, then go to the next step.

(See AUDIO UNIT REMOVAL/INSTALLATION.)

No

Go to the next step.

3

VERIFY THAT NO OTHER DTCs ARE RECORDED

• Are any other DTCs displayed?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [AUDIO].)

No

DTC troubleshooting completed.