1. Check for continuity between the No. 15 terminal of climate control unit connector A (22P) and the No. 2 terminal of the outside air temperature sensor 2P connector.

Is there continuity?

YES | - | Check for loose wires or poor connections at climate control unit connector A (22P) and at the outside air temperature sensor 2P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit .■
NO | - | Repair open in the wire between the climate control unit and the outside air temperature sensor.■