Test A: No Communication With the Navigation System Module
PINPOINT TEST A: NO COMMUNICATION WITH THE NAVIGATION SYSTEM MODULEA1-A2:
A2 Continued:
Normal Operation
Battery voltage is supplied to the navigation system module through circuit 1001 (WH/YE). The accessory/delay relay supplies voltage to the navigation system module through circuit 1002 (BK/PK). Circuit 1205 (BK) provides the navigation system module ground.
Possible Causes
- circuit 1001 (WH/YE) open or short to ground
- circuit 1002 (BK/PK) open or short to ground
- circuit 1205 (BK) open
- navigation system module