Navigation Communication Line Circuit Troubleshooting
Navigation Communication Line Circuit Troubleshooting1. Disconnect navigation unit connector A (20P).
2. Disconnect climate control unit connector A (20P).
3. Check for continuity between the following terminals of climate control unit connector A (20P) and navigation unit connector A (20P).
Is there continuity?
YES - Go to step 4.
NO - Repair open in the wire(s) between the climate control unit and the navigation unit.
4. Check for continuity between body ground and climate control unit connector A (20P) terminals No. 17, 18, and 19 individually.
Is there continuity?
YES - Repair short to body ground in the wire(s) between the climate control unit and the navigation unit.
NO - Check for loose wire or poor connections at climate control unit connector A (20P) 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.