Blower Control Module Description

The blower motor control module contains solid state circuitry. At a given duty cycle, the circuitry utilizes a pulse width voltage signal from the control head. The circuitry returns an inverse pulse width signal to the blower motor.

[1][2]Blower Control Module Description

Signal to Blower Motor Signal out of Blower
Control Module from Motor Control Module to
HVAC Control Blower

0- 5% Duty Off (Short)
6% Duty High
7% - 94% Duty Inverse Variable Output
95% Duty Low
96% - 100% Duty On

The control head pulse width signal is based on the following conditions:
^ The temperature set by the user
^ The outside air temperature
^ The in-vehicle temperature
^ The input from the solar sensor

For example, the blower motor control module will adjust the blower accordingly when the following conditions exist:
^ The temperature inside of the vehicle is much colder or hotter than the temperature that the user sets.
^ The user selects the AUTO button.

The blower motor control module will change the blower from a high speed to a low speed as the temperature inside the vehicle becomes closer to the set temperature.