Journey FWD V6-3.5L (2009)
Control Module HVAC: Description and Operation
Front Blower Motor Power Module - Operation
OPERATION
The blower motor power module is connected to the vehicle electrical system through a dedicated lead and connector of the instrument panel wire
harness. A second lead and connector of the instrument panel wire harness 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 See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
The blower motor power module cannot be adjusted or repaired must be replaced if inoperative or damaged.
