The driver information center (DIC) applies 5 volts to the ambient air temperature sensor. The ambient air temperature sensor is a thermistor which varies in resistance as the temperature changes. As the resistance of the ambient air temperature sensor increases, the DIC senses a larger voltage drop across the sensor indicating a lower temperature. As the resistance of the ambient air temperature sensor decreases, the DIC senses a smaller voltage drop across the sensor indicating a higher temperature.

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Displays and Gages Connector End Views

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, disconnect the harness connector of the ambient air temperature sensor. Install a signal generator and instrument panel tester between the signal circuit and the low reference circuit.
2. Ignition ON, vary the resistance on the signal generator from 600-97,000 ohms. Refer to Sensor Resistance Table . Verify that the temperature displayed on the DIC matches the resistance values in the Sensor Resistance Table.

⇒	If the temperature is incorrect, test the signal circuit and the low reference circuit for an open/high resistance. If the circuit tests normal, replace the IPC.

3. If all circuits test normal, test or replace the ambient temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.