Inputs / Outputs
- Engine speed:
- Input to the A/CCM from the ECM.
- Heated windshield and backlight will be inhibited when engine speed < 50 RPM.
- Vehicle speed:
- Input from the instrument cluster.
- Blower speed control to minimize the effects of ram air. Road speed compensation is inhibited when maximum cooling LO, or maximum heating HI, is selected; also inhibited in defrost mode with airflow set to maximum.
- Used to determine the frequency at which the exterior temperature display is updated.
- Coolant temperature (signal derived from ECM via instrument cluster):
- Input from the heater matrix temperature sensor used to control water valve and thus vent temperatures.
- Used to monitor the temperature of coolant at the heater matrix to assist the control of air outlet temperature.
- Used to inhibit the blowers when heating is selected and the engine coolant temperature is below 30°C.
- Is used to provide progressive increase in blower speed up to 60°C.
- To inhibit the water valve and pump when the coolant temperature is = < 10°C
- Compressor ON signal:
- Input to the A/CCM from the compressor relay output.
- Used to determine compressor fault conditions.