Ambient Temperature Sensor - Operation

OPERATION

The ambient air temperature sensor is a variable resistor that operates on a 5 volt Direct Current (DC) reference signal sent by the Body Control Module (BCM). The ambient air temperature sensor is connected to the BCM through a two-wire lead and connector of the vehicle wire harness. The ambient air temperature sensor changes its internal resistance in response to changes in the outside air temperature, which either increases or decreases the reference signal voltage read by the BCM. The BCM converts and broadcasts the sensor data over the Controller Area Network (CAN) data bus, where it is read by the Automatic Temperature Control (ATC) A/C heater module, Powertrain Control Module (PCM) and other vehicle control modules.

The ambient air temperature sensor is diagnosed using a scan tool.

The ambient air temperature sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged Ambient Temperature Sensor - Removal.