Ambient Temperature Sensor Circuit Short

When Monitored: With the ignition on.

Set Condition: The BCM detects that the Ambient Temperature Sensor signal circuit voltage is less than 0.3 volts for 5 seconds or Customer complaint: EVIC temperature display is 130°F (55°C).

Possible Causes are:

• AMBIENT TEMPERATURE SENSOR
• AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
• AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO SENSOR RETURN CIRCUIT
• BODY CONTROL MODULE

1. Turn ignition off. Disconnect the Ambient Temperature Sensor harness connector. Close all vehicle doors. Turn ignition on. Observe the EVIC display. Does the EVIC display -40°F (-40°C)? 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. Disconnect the BCM C2 harness connector. Disconnect the Ambient Temperature Sensor harness connector. Measure the resistance between ground and the Ambient Temperature Sensor Signal circuit. Is the resistance less than 5 ohms? If yes, repair the Ambient Temperature Sensor Signal circuit for a short to ground. 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 between the Ambient Temperature Sensor Signal circuit and Ambient Temperature Sensor Return circuit. Is the resistance less than 5 ohms? If yes, repair the Ambient Temperature Sensor Signal circuit for a short to the Sensor Return circuit. 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.