Liberty 2WD V6-3.7L (2008)
Solar Sensor: Description and Operation
Operation
OPERATION
The infrared sensor detects thermal radiation emitted by the driver and front seat occupants and surroundings and converts its data into a linear pulse
width modulated (PWM) output signal which is read by the automatic temperature control (ATC) A/C-heater control. The ATC A/C-heater control uses
the infrared sensor data as one of the inputs necessary to automatically control the interior cabin temperature level. By using thermal radiation (surface
temperature) measurement, rather than an air temperature measurement, the ATC heating-A/C system is able to adjust itself to the comfort level as
perceived by the front seat occupants. This allows the ATC system to compensate for other ambient conditions affecting comfort levels, such as solar
heat gain or evaporative heat loss.
The ATC system logic responds to the infrared sensor message by calculating and adjusting the air flow temperature and air flow rate needed to properly
obtain and maintain the selected comfort level temperature of the occupants. The A/C-heater control continually monitors the infrared sensor circuit, and
will store diagnostic trouble codes (DTCs) for any problem it detects.
The infrared sensor is diagnosed using a scan tool.
The infrared sensor cannot be adjusted or repaired and must be replaced if inoperative or damaged.
