Pollution Sensor

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The pollution sensor is mounted on the inboard side of the air inlet duct, in the fresh air inlet.

The pollution sensor has battery power, ground and signal connections with the Automatic Temperature Control Module (ATCM) module. Semiconductor material in the sensor undergoes a change of conductance if exposed to specific gases. The sensor uses this property to monitor for gases such as Carbon Monoxide (CO) and Nitrogen Oxides (NOx) and so determine the quality of the fresh air entering the vehicle. The sensor transmits the air quality to the ATCM, in a Pulse Width Modulation (PWM) signal, as one of the following four conditions:

Static or reduced pollution levels
Small increase in pollution levels
Medium increase in pollution levels
Rapid or large increase in pollution levels.

Based on the signal from the pollution sensor, the ATCM controls the intake air source to reduce the amount of contaminants entering the interior. It is possible to put the system into recirculation via the switch but it is not possible to select fresh air. The pollution sensor may be turned off via the climate settings on the touch screen.