Front Infrared Temperature Sensor

Front Infrared Temperature Sensor

Description






The infrared sensor is used only on models equipped with the automatic temperature control HVAC system. The infrared sensor is located in the front overhead console. The infrared transducer consists of an infrared transducer (1) contained within a black molded plastic housing (2) with an integral wire connector receptacle (3). The integral mounting tab (4) allows the infrared sensor to be secured with one screw to the overhead console.

Operation

The infrared sensor detects thermal radiation emitted by the front seat occupants and surroundings and converts the data into a linear pulse width modulated output signal which is read by the automatic temperature control HVAC control. The ATC HVAC control uses the infrared sensor data as one of the inputs necessary to automatically control the interior cabin temperature levels. By using thermal radiation (surface temperature) measurement, rather than an air temperature measurement, the ATC HVAC system is able to adjust itself to the comfort level as perceived by the 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 circuits, and will store a diagnostic trouble code 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.