Test A: No Communication With The Audio Unit - CDX6 and DM100I Only

PINPOINT TEST A: NO COMMUNICATION WITH THE AUDIO UNIT - CDX6 AND DM100I ONLY

A1:

A1-A3:

A3 Continued:

Normal Operation
When the ignition switch is in the RUN position and the audio unit is turned on, communication is possible between the diagnostic tool and the audio unit through the standard corporate protocol (SCP) communications network. The audio unit receives power at all times through circuit 29-MD15 (OG/BK), and power in RUN/ACC through circuit 75-MD15. Ground for the audio unit is provided through circuit 31-MD15 (BK/GN) (DM100i) or 31-MD15A (BK/GN) (CDX6).

Possible Causes
- Fuse
- Circuit 29-MD15 (OG/BK) open
- Circuit 31-MD15 (BK/GN) open (DM100i)
- Circuit 31-MD15A (BK/GN) open (CDX6)
- Circuit 75-MD15 (YE/GN) open
- Audio unit
- Central junction box (CJB)