1. Disconnect the inside air temperature sensor harness connector.
2. Turn the ignition switch to the RUN position.
3. Place the heater-A/C control in the AUTO position.
4. Use a digital multimeter (DMM) in order to measure the voltage between the inside air temperature sensor harness connector terminal A (circuit 734) and ground.

Is the measured voltage within the specified range?

4-6 V

Go to Step 2

Go to Step 3

Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement .

Is the repair complete?

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Go to Step 6

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1. Disconnect the heater-A/C control harness connector.
2. Use a test lamp, connected to B+, in order to probe the heater-A/C control connector terminal D 2.

Does the test lamp light?

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Go to Step 4

Go to Step 5

Locate and repair a short to ground in circuit 734 (DK GRN) between the heater-A/C control harness connector and the inside air temperature sensor harness connector.

Is the repair complete?

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Go to Step 6

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Replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

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Go to Step 6

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Verify that the system operates properly.

Does the system operate properly?

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System OK

Go to Diagnostic System Check