Sensor, Humidity: Operation

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

The humidity sensor detects humidity, dew point and windshield glass temperature, and sends this information to the Body Control Module (BCM) over a Local Interface Network (LIN) data bus connection. The BCM then broadcasts the message over the Controller Area Network (CAN) data bus to the Heating, Ventilation and Air Conditioning (HVAC) module. The HVAC module automatically adjusts A/C clutch operation, amount of recirculated air, blower motor speed and outlet modes to prevent fogging on the inside of the windshield glass. If the humidity sensor message is not received by the HVAC module, a Diagnostic Trouble Code (DTC) will set. The information the HVAC module receives from the humidity sensor can be viewed using a scan tool.

The humidity sensor is provided a fused ignition power supply through a fuse in the Power Distribution Center (PDC). Ground is provided at the floor pan near the front of the floor console.

The humidity sensor is diagnosed using a scan tool. Refer to HEATING & AIR CONDITIONING (ATC) DIAGNOSTIC CODE INDEX .

The humidity sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged.