Rear Blower Motor Power Module - Operation

OPERATION

The rear blower motor power module is connected to the vehicle electrical system through a lead and connector of the rear A/C system wire harness. The rear blower motor power module allows the microprocessor-based automatic temperature control (ATC) A/C-heater control to calculate and provide blower motor speeds based upon blower control switch input.

The Pulse Width Modulated (PWM) voltage is applied to a comparator circuit which compares the PWM signal voltage to the rear blower motor feedback voltage. The resulting output drives the power module circuitry, which provides a linear output voltage to change or maintain the desired rear blower speed.

The rear blower motor power module is diagnosed using a scan tool Testing and Inspection.

The rear blower motor power module cannot be adjusted or repaired and must be replaced if inoperative or damaged.