Test A: No Communication With the Audio Unit

PINPOINT TEST A: NO COMMUNICATION WITH THE AUDIO UNIT

A1-A2:

Normal Operation
The audio unit receives voltage at all times through circuit SBP03 (BU/RD), voltage in RUN/ACC through circuit CBP12 (GN/WH), and ground through circuit GD114 (BK/BU). Communication with the diagnostic tool occurs over the controller area network (CAN) through circuits VDB06 (GY/OG) and VDB07 (VT/OG).

Possible Causes
- Fuse
- Circuit SBP03 (BU/RD) open
- Circuit CBP12 (GN/WH) open
- Circuit GD114 (BK/BU) open
- Audio unit