Rear Power Module

A rear blower power module is used on this model. The blower power module is installed in the rear blower motor housing, which is located within the center floor console. The power module consists of a molded plastic mounting plate with two integral wire harness connector receptacles. Concealed behind the mounting plate within the blower motor housing is the power module electronic circuitry and a large finned, heat sink. The module mounting plate is secured with two screws to the rear blower motor housing and is accessed for service by removing the front center floor console.

The power module heat sink will get hot when in use. Do not touch the heat sink if the blower motor has been running. The blower power module cannot be adjusted or repaired and, if faulty or damaged, it must be replaced.

The blower power module is connected to the vehicle electrical system through a dedicated wire harness lead and connector from the body wire harness. A second connector receptacle receives the wire harness connector from the blower motor. The blower power module allows the microprocessor-based Automatic Temperature Control (ATC) heater-A/C control module 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 adjusts the voltage output received from the blower motor relay to change or maintain the desired blower speed. Refer to Body Diagnostic Procedures for further diagnostic information.