The ambient air temperature sensor is a variable resistor interfaced to the driver information center (DIC) via the outside air temperature sensor signal circuit and low reference circuit. The DIC provides the logic for reading the ambient air temperature sensor, filtering the data and displaying the ambient air temperature. A warmer ambient air temperature results in a lower ambient air temperature sensor resistance. Temperature reading exceeding 143°F (62°C) is out of the DIC temperature range and will not be displayed. When the ambient air temperature reading exceeds 143°F (62°C), "SC" is displayed in the DIC. A colder ambient air temperature results in a higher ambient air temperature sensor resistance. Temperature reading lower than -40°F (-40°C) is out of the DIC temperature range and will not be displayed. When the ambient air temperature reading is lower than -40°F (-40°C), "OC" is displayed in the DIC. In colder temperatures such as 37°F (3°C) or below, the mirror displays "ICE" when the ignition is first turned on. The DIC temperature display toggles between "ICE" and the actual ambient temperature until the temperature update process is complete. If the ambient air temperature sensor is opened or shorted, the temperature displayed is either a cold or hot extreme. An open ambient air temperature sensor displays as "OC" and an outside air temperature sensor shorted to ground displays as "SC".

Schematic Reference

Connector End View Reference

Displays and Gages Connector End Views

Description and Operation

Driver Information Center (DIC) Description and Operation

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

1. Ignition OFF, disconnect the harness connector at the ambient air temperature sensor.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal B and ground.

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

3. Ignition ON, verify the DIC displays "OC".

⇒	If the DIC does not display "OC", test the ambient air temperature sensor signal circuit terminal A for a short to ground. If the circuit tests normal, replace the DIC.

4. Ignition ON, install a 3 amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the DIC displays "SC".

⇒	If the DIC does not display "SC", test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DIC.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.