Sunload Sensor

The sunload sensor provides the HVAC control module software with the amount of sun light entering the vehicle through the windshield. A 5-volt reference signal is sent from the HVAC control module to the sunload sensor over the driver solar sensor signal circuit. A variable photo-diode resistor inside the sensor varies the voltage. That varied voltage provides a signal to the software inside the HVAC control module. Remaining voltage from the sunload sensor is sent back to the HVAC control module ground through the low reference circuit.