DTC 1
DTC 1: An Open in the In-car Temperature Sensor Circuit1. Remove the in-car temperature sensor.
2. Measure the resistance between the No.1 and No.2 terminals of the in-car temperature sensor.
*Check for a change in resistance by heating or cooling the sensor with a hair drier.
* Is the resistance within the specifications shown on the graph?
YES - Go to step 3.
NO - Replace the in-car temperature sensor.
3. Disconnect the climate control unit 30P connector.
4. Check for continuity between the No.8 terminal of the climate control unit 30P connector and the No.1 terminal of the in-car 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 in-car temperature sensor.
5. Check for continuity between the No.2 terminal of the climate control unit 30P connector and the No.2 terminal of the in-car temperature sensor 2P connector.
Is there continuity?
YES - Check for loose wires or poor connections at the climate control unit 30P connector and at the in-car 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 in-car temperature sensor.