Climate Control/Navigation Communication Line Circuit Troubleshooting
  1. Check for continuity between body ground and the navigation unit connector A (20P) terminals No. 4, 14, and 15 individually.
Is there continuity?
YES -
Repair short to body ground in the wire(s) between the climate control unit and the navigation unit.■
NO -
Go to Step 8 .
  1. Reconnect the climate control unit 32P connector.
  1. Disconnect navigation unit connector A (20P).