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

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

B1-B2:

B2-B4:

B4-B6:

Normal Operation
The audio unit receives voltage at all times through circuit 29-MD15 (OG/BK), and receives voltage through the accessory delay circuit 10-MD15 (GY/OG) (navigation) from the driver door module (DDM) when the accessory delay is active. Ground for the audio unit (navigation) is provided through circuits 31-MD15A (BK/GN) and 31-MD15B (BK/GN).

Possible Causes
- Fuse
- Circuit 29-MD15 (OG/BK) open
- Circuit 31-MD15A (BK/GN) open
- Circuit 31-MD15B (BK/GN) open
- Audio unit
- Central junction box (CJB)
- DDM