Climate Control-Navigation Communication Line Circuit Troubleshooting
  1. Check for continuity between body ground and climate control unit connector B (12P) No. 7, 8, and No. 9 terminals 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 climate control unit connector B (12P).