WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Ambient Air Temperature Sensor Signal Circuit
B0160
B0161
B0161
Ambient Air Temperature Sensor Low Reference Circuit