Humidity Sensor - Operation

OPERATION

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

The humidity sensor is diagnosed using a scan tool Testing and Inspection.

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