Commander 4WD V8-4.7L VIN N (2006)
Ambient Temperature Sensor / Switch HVAC: Description and Operation
Sensor-Ambient Air Temperature
SENSOR-AMBIENT AIR TEMPERATURE
DESCRIPTION
The ambient air temperature sensor is a variable resistor that monitors the air temperature outside of the vehicle. The ATC system uses the sensor data to
maintain optimum cabin temperature levels. The ambient air temperature sensor is mounted onto the top of the front bumper beam.
The ambient temperature sensor is a variable resistor type sensor. it is mounted to the lower front fascia behind the radiator grille and in front of the
engine compartment.
The ambient temperature sensor cannot be adjusted or repaired and, if inoperative or damaged, it must be replaced.
OPERATION
The ambient air temperature sensor is a variable resistor that operates on a 5-volt reference signal sent by the front control module (FCM). The ambient
air temperature sensor is connected to the FMC 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 FCM. The FCM converts and broadcasts the sensor data over the controller area network (CAN) B bus, where it is read by the ATC A/C-heater
control and other vehicle control modules.
The ambient air temperature sensor is diagnosed using the scan tool. Refer to Computer and Control System.
The ambient air temperature sensor cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.
