Blower & A/C Controls (Full Auto)
CIRCUIT DESCRIPTIONThe A/C control module receives input signals(for instance, photo sensor, AQS sensor, humidity sensor, evaporator sensor, ambient temperature sensor, etc.) and controls the operation of air conditioning system. The A/C control module and various sensor signals provide accurate control of air mixture using blend door actuator, temperature actuator and intake actuator under all operating conditions.
The blower motor runs at the highest speed when the high blower relay coil energized through A/C control module. The tunction of the power transistor is that of the blower resister in manual A/C. The power transistor is controlled by the input currents applied to the power transistor BASE terminal.