A/C Humidity Sensor -G260-

Installation Location 

Only the Climatronic systems have the A/C Humidity Sensor -G260-. It is installed in the base of the interior mirror, combined with the rain/light sensor.

Design and Functional Principle 

The humidity and the temperature at the window are measured using a capacitive thin-layer sensor. The sensor functions like a plate capacitor; measurement of the capacity indicates the degree of humidity.

Signal Utilization 

The sensor determines:

• The inside windshield temperature
• The inside relative humidity

The signals are sent to the Vehicle Electrical System Control Module -J519-, then through the Convenience CAN-Bus to Climatronic Control Module -J255-. Climatronic Control Module -J255- uses the signals to calculate the internal dew point.

To reduce windshield fogging, the Climatronic system influences:

• Turns the compressor ON or OFF
• Opens or closes defroster flaps
• Changes the fresh air blower speed for air quantity regulation
• Changes the evaporator temperature
• Controls the air recirculation flap between the recirculation or fresh air positions

Effects of Failure 

Without the sensor signal, Climatronic Control Module -J255- cannot detect the dew point. The automatic defrost function fails.