Ambient Temperature Sensor

WARNING: This page is about a different car, the 2003 Chrysler Concorde, 2003 Chrysler 300M, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.

The ambient temperature sensor is a variable resistor that operates on a 5-volt reference signal sent to it by the BCM. The resistance in the sensor changes as temperature changes, changing the temperature sensor signal circuit voltage to the BCM. Based upon the resistance in the sensor, the BCM senses a specific voltage on the temperature sensor signal circuit, which it is programmed to correspond to a specific temperature. The BCM then sends the proper ambient temperature messages to the EVIC over the PCI data bus. The thermometer function is supported by the ambient temperature sensor, a wiring circuit, the BCM, the PCI data bus, and a portion of the EVIC module. If any portion of the ambient temperature sensor circuit fails, the BCM will self-diagnose the circuit.