Circuit/System Verification
WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, engine OFF, observe the ambient air temperature sensor temperature through the DIC. The reading should be the ambient temperature setting. If the display of the DIC for temperature reads dashes, check for a sensor signal circuit fault.