Test A: No Communication With The Navigation Module

PINPOINT TEST A: NO COMMUNICATION WITH THE NAVIGATION MODULE

A1-A2:

Normal Operation
The navigation module receives battery voltage from the central junction box (CJB) through circuit 1772 (VT), and from the battery junction box (BJB) through circuit 1499 (PK/LG). The navigation module is grounded through circuit 694 (BK/LG). The navigation module communicates with the diagnostic tool and with other vehicle modules through the standard corporate protocol (SCP) network.

Possible Causes
- fuse(s)
- circuit 694 (BK/LG) open
- circuit 1499 (PK/LG) open
- circuit 1772 (VT) open