CTS V6-3.2L VIN N (2003)
Solar Sensor: Description and Operation
AIR TEMPERATURE
Sunload Sensor
The sunload sensor is a 2 wire photo diode. The vehicle uses left and right sunload sensors. The two sensors are integrated into the sunload sensor
assembly along with the ambient light sensor. Low reference and signal circuits enable the sensor to operate. As the sunload increases, the sensor
signal decreases. The sensor operates within an intensity range between completely dark and bright. The sensor signal varies between 0-545 volts. The
HVAC control module converts the signal to a range between 0-255 counts. The sunload sensor provides the HVAC control module a measurement of
the amount of light shining on the vehicle. Bright, or high intensity, light causes the vehicles inside temperature to increase. The HVAC system
compensates for the increased temperature by diverting additional cool air into the vehicle. If the sensor is open, no sunload adjustment occurs. If the
sensor is shorted, maximum sunload adjustment occurs with increased cooling mode.
