Ambient Temperature Sensor / Switch HVAC: Description and Operation
AIR TEMPERATURE SENSORSThe air temperature sensors are a 2-wire negative temperature co-efficient thermistor. The vehicle uses the following air temperature sensors:
- Ambient air temperature sensor
- Inside air temperature sensor
A signal and low reference circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance decreases. The sensor signal voltage decreases as the resistance decreases. The sensor operates within a temperature range between -40 °C (-40 °F) to 101 °C (215 °F). The sensor signal varies between 0-5 volts.
The input of the duct sensor temperature is different from the ambient and inside sensors. The HVAC control module converts the signal to a range between 0-255 counts. As the air temperature increases the count value will decrease.
If the HVAC control module detects a malfunctioning sensor, then the control module software will use a defaulted air temperature value. The default action ensures that the HVAC system can adjust the inside air temperature near the desired temperature until the condition is corrected.
The driver information center (DIC) displays the ambient air temperature value that it receives from the HVAC control module through a class 2 message. The scan tool has the ability to update the displayed ambient air temperature. The ambient air temperature value is displayed or updated under the above conditions.