Displaying Faults And Reading Faults - ATC System
WARNING: This page is about a different car, the 2008 Dodge Magnum, 2008 Dodge Charger, and 2008 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Use a scan tool to display DTCs stored in the A/C-heater control of the ATC system (refer to HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS article for more information).