Non-Trouble Code Procedures
NAV. Communication Line Circuit Troubleshooting1. Disconnect navigation unit connector A (20P).
2. Disconnect the climate control unit 30P connector.
3. Check for continuity between the terminals of the climate control unit 30P connector and navigation unit connector A (20P).
Is there continuity?
YES - Go to step 4.
NO - Repair any open in the wire(s) between the climate control unit and the navigation unit.
4. Check for continuity between body ground and the climate control unit 30P connector terminals No. 24, 25, and 26 individually.
Is there continuity?
YES - Repair any short to body ground in the wire(s) between the climate control unit and the navigation unit.
NO - Check for loose wires or poor connections at the climate control unit 30P connector and at the navigation unit connector A (20P). If the connections are good, substitute a known-good climate control unit and/or navigation unit, and recheck. If the symptom/indication goes away, replace the original climate control unit and/or navigation unit.