Grand Cherokee 2WD V6-3.7L (2008)
Ambient Temperature Sensor / Switch HVAC: Description and Operation
Operation
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 a scan tool .
The ambient air temperature sensor cannot be adjusted or repaired and must be replaced if found inoperative or damaged.
