Vanden Plas (X308) V8-4.0L SC (AJ27) (2001)
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Heated windshield and backlight will be inhibited when engine speed < 50 RPM.
2. Vehicle speed:
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Input from the instrument cluster.
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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.
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Used to determine the frequency at which the exterior temperature display is updated.
3. Coolant temperature (signal derived from ECM via instrument cluster):
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Input from the heater matrix temperature sensor used to control water valve and thus vent temperatures.
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Used to monitor the temperature of coolant at the heater matrix to assist the control of air outlet temperature.
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Used to inhibit the blowers when heating is selected and the engine coolant temperature is below 30 °C.
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Is used to provide progressive increase in blower speed up to 60 °C.
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To inhibit the water valve and pump when the coolant temperature is =< 10 °C