Automatic A/C
CIRCUIT DESCRIPTIONThe A/C control module receives inputs from the A/C sensor (for instance, photo sensor, AQS sensor, defogger switch, evaporator temperature sensor, water temperature sensor, ambient sensor, etc.) and controls the function for air conditioning system. The A/C control module and various sensors provide accurate control of air mixture using the mode actuator, the temperature actuator and the intake actuator under all operating conditions.
The blower motor runs at the highest speed when the high blower relay coil is energized through the 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 that are applied to the power transistor BASE terminal.