Blower Control Module

When the blower is required, the ACCM energizes the coil of the rear blower relay. The energized rear blower relay supplies battery power to the blower motor, which is connected to ground through the blower control module. The speed of the blower is controlled by the blower control module, which regulates the blower motor voltage in response to a PWM (pulse width modulation) signal from the ACCM. To vary the blower motor voltage the ACCM varies the duty cycle of the signal.