## Climate Control

#### DTC Troubleshooting

21-114

4-door DTC 1: An Open in the In-car Temperature Sensor Circuit

1. Remove the in-car temperature sensor (see page 21-149).
2. Measure the resistance between the No. 1 and No. 2 terminals of the in-car temperature sensor.

   *Check for change in resistance by heating or cooling the sensor with a hair drier.

IN-CAR TEMPERATURE SENSOR

*Is the resistance within the specifications shown on the graph?

YES -Go to step 3.

NO - Replace the in-car temperature sensor.

3. Disconnect climate control unit connector B (22P).

4. Check for continuity between the No. 9 terminal of climate control unit connector B (22P) and the No. 1 terminal of the in-car temperature sensor 2P connector.

CLIMATE CONTROL UNIT CONNECTOR B (22P)

Wire side of female terminals

IN-CAR TEMPERATURE SENSOR 2P CONNECTOR

Wire side of female terminals

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. Disconnect climate control unit connector A (14P).
6. Check for continuity between the No. 2 terminal of climate control unit connector A (14P) and the No. 2 terminal of the in-car temperature sensor 2P connector.

CLIMATE CONTROL UNIT CONNECTOR A (14P)

Wire side of female terminals

IN-CAR TEMPERATURE SENSOR 2P CONNECTOR

Wire side of female terminals

Is there continuity?

YES - Check for loose wires or poor connections at climate control unit connectors A (14P) and B (22P) 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.