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The carbon dioxide gas sensor measures gaseous carbon dioxide levels by detecting the quantity of IR radiation absorbed by carbon dioxide molecules. The sensor employs a hot metal filament that acts as an IR source to generate IR radiation. The IR source is located at one end of a sensor tube, and another end is provided with an IR sensor.
The ambient temperature sensor is a variable resistor that works on a five-volt reference signal that is delivered to it by the Body Control Module (BCM). The resistance in the sensor adjusts to the change in temperature, changing the temperature sensor signal circuit voltage to the BCM. Depending on the resistance in the sensor, the BCM senses a certain voltage on the temperature sensor signal circuit, which it is programmed to match a certain temperature.