Displaying Faults And Reading Faults - ATC System
WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 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 DTC-Based Diagnostics/HVAC - Diagnosis and Testing .