Navigation Communication Line Circuit Troubleshooting
Navigation Communication Line Circuit Troubleshooting1. Disconnect navigation unit connector A (20P).
2. Disconnect the climate control unit 30P connector.
3. Check for continuity between the following terminals of the climate control unit 30P connector and navigation unit connector A (20P).
Is there continuity?
YES - Go to step 4.
NO - Repair open in the wires between the climate control unit and the navigation unit.
4. Check for continuity between body ground and the climate control unit 30P connector No. 24, 25, and 26 terminals individually.
Is there continuity?
YES - Repair short to body ground in the wires 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.