Nitro 2WD V6-4.0L (2007)
Control Module HVAC: Description and Operation
Blower Motor Power Module - Operation
OPERATION
The blower motor power module is connected to the vehicle electrical system through a dedicated lead and connector. A second lead and connector is
connected to the blower motor. The blower motor power module allows the microprocessor-based automatic temperature control (ATC) A/C-heater
control to calculate and provide infinitely variable blower motor speeds based upon either manual blower switch input or the ATC programming using a
pulse width modulated (PWM) circuit strategy.
The PWM voltage is applied to a comparator circuit which compares the PWM signal voltage to the blower motor feedback voltage. The resulting
output drives the power module circuitry, which provides a linear output voltage to change or maintain the desired blower speed.
The blower motor power module is diagnosed using a scan tool.
The blower motor power module cannot be adjusted or repaired must be replaced if inoperative or damaged.
