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.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit and ground.

⇒	If greater than 1.0 ohm, test the low reference circuit for an open/high resistance.

3. Ignition ON, install a 3-amp fused jumper wire between the ambient air temperature sensor signal circuit and ground. Verify that SC is displayed on the DIC display.

⇒	If SC is not displayed, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal replace the IPC.

4. If the display is correct, test or replace the ambient air temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.