Humidity Sensor - Operation

OPERATION

The humidity sensor detects humidity, dew point, windshield temperature and infrared sensor data and sends this information to the Hybrid Gateway Module (HGM) via a Local Interconnect Network (LIN) bus connection. The HGM then sends the message via the Controller Area Network (CAN) C bus to the Front Control Module (FCM), which ports the message to the A/C-heater control over the CAN B bus. If the humidity sensor message is not received by the A/C-heater control, the evaporator logic will be disabled, the evaporator target will be set to 3.3° C (38° F) and a Diagnostic Trouble Code (DTC) will set. The information the A/C-heater control 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.