DTC C
DTC indicator light C: An Open in the Outside Air Temperature Sensor Circuit1. Remove the outside air temperature sensor.
2. Measure the resistance between the No. 1 and No. 2 terminals of the outside air temperature sensor. Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor, and check for a change in resistance.
Is the resistance within the specifications shown on the graph?
YES - Go to step 3.
NO - Replace the outside air temperature sensor.
3. Disconnect climate control unit connector B (30P).
4. Check for continuity between the No. 19 terminal of climate control unit connector B (30P) and the No. 2 terminal of the outside air temperature sensor 2P connector.
Is there continuity?
YES - Go to step 5.
NO - Repair open in the wire between the climate control unit and the outside air temperature sensor.
5. Check for continuity between the No. 3 terminal of climate control unit connector B (30P) and the No. 1 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 B (30P) 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.