Circuit/System Description
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
A thermistor is imbedded in the transmission control module (TCM). There are no external circuits. The TCM monitors the temperature and will take action to prevent damage to the TCM.