Test A: The Audio Unit Is Inoperative/Does Not Operate Correctly

PINPOINT TEST A: THE AUDIO UNIT IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

A1-A3:

A3-A4:

Normal Operation
The audio unit receives voltage through circuit SBP24 (VT/RD) at all times, and through circuit CBP06 (WH/BU) with the key in RUN or ACC. Ground is provided to the audio unit through circuit GD103 (BK/BU) (illumination only) and circuit GD103 (BK/BU). With the key in RUN or ACC and the audio unit on, all functions are operational.

Possible Causes
- Fuse
- Circuit CBP06 (WH/BU) open
- Circuit GD103 (BK/BU) open
- Circuit SBP24 (VT/RD) open
- Audio unit