Circuit/System Verification
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the ambient air temperature sensor. The reading should be between -35°C (-39°F) and 85°C (185°F) and change with ambient air temperature changes.