Ambient Temperature Sensor: Description
WARNING: This page is about a different car, the 2004 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.
Ambient air temperature is connected to the instrument cluster through a two-wire harness lead and connector of the vehicle electrical system. The instrument cluster sends out a message on the CAN bus to the ATC control module. The ambient temperature sensor is a variable resistor mounted to the front licence plate bracket.