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Ambient Temperature Sensor Circuit Open

When Monitored: With the ignition on.

Set Condition: The BCM detects the Ambient Temperature Sensor Signal circuit voltage is more than 4.8 volts for 5 seconds or more.

Customer complaint: EVIC temperature display is -40°F (-40°C).

Possible Causes are:

  1. Disconnect the Ambient Temperature Sensor harness connector. Connect a jumper wire between the sensor signal and sensor ground circuits. Close all vehicle doors. Turn ignition on. Using the DRBIII(R) in Sensors, read the Outside Temperature voltage. Is the voltage less than 0.5 volts? If yes, replace the Ambient Temperature Sensor. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
  2. Turn ignition off. All Disconnect the Ambient Temperature Sensor harness connector. Disconnect the BCM C2 harness connector. Measure the voltage between the Ambient Temperature Sensor Signal circuit and ground. Is there any voltage present? If yes, repair the Ambient Temperature Sensor Signal circuit for a short to voltage. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
  3. Turn ignition off. Disconnect the Ambient Temperature Sensor harness connector. Disconnect the BCM C2 harness connector. Measure the resistance of the Ambient Temperature Sensor Return circuit between the BCM C2 harness connector and the Sensor harness connector. Is the resistance more than 5 ohms? If yes, repair the Ambient Temperature Sensor Return circuit for an open. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, go to next step.
  4. Turn ignition off. Disconnect the BCM C2 harness connector. Disconnect the Ambient Temperature Sensor harness connector. Measure the resistance of the Ambient Temperature Sensor Signal circuit between the BCM C2 harness connector and the Sensor harness connector. Is the resistance more than 5 ohms? If yes, repair the Ambient Temperature Sensor Signal circuit for an open. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS. If no, replace the Body Control Module. Perform BODY VERIFICATION TEST VER 1  under VERIFICATION TESTS.
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