Navigation Communication Line Circuit Troubleshooting (With Climate Control)

Navigation Communication Line Circuit Troubleshooting

1. Disconnect navigation unit connector B (32P).

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 B (32P).









Is there continuity?

YES -

Go to step 4.

NO -

Repair an 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 30P connector terminals No. 24, 25, and 26 individually.





Is there continuity?

YES -

Repair a 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 the navigation unit connector B (32P). 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 Climate Control Unit Removal/Installation and/or navigation unit Service and Repair.�