Automatic A/C-Heater Systems: Self-Diagnostics: Notes

A/C-heater control assembly monitors system circuits and stores a Diagnostic Trouble Code (DTC) in memory if a problem is detected. All DTCs are stored in memory, except DTC 22. Malfunction is current if DTC 22 is displayed. DTCs are displayed at A/C-heater control assembly temperature display. See Figure. DTCs can also be displayed using a scan tool.