Fault Detection - HVAC System - Automatic

The instrument panel module will not flash the heater and A/C control when a system fault occurs. The only alerts to the user that the HVAC system is not operating properly are:
^ If the ambient air temperature sensor fails, the set temperature will display (instead of the outside air temperature) when the system is ON.
^ If only --- is displayed on the heater and A/C control, this indicates a loss of communication between the instrument panel module and the heater and A/C control.