Rear

Rear Blower Motor Power Module:

A rear blower motor power module is used on this model when equipped with the automatic temperature control (ATC) heating-A/C system. Models equipped with the manual temperature control (MTC) heating-A/C system use a blower motor resistor, instead of the blower motor power module.

The rear blower motor power module is installed in the back of the rear HVAC housing, directly below the rear blower motor. The power module consists of a molded plastic mounting plate with two integral connector receptacles. Concealed behind the mounting plate is the power module electronic circuitry and heat sink. The rear blower motor power module is accessed for service by removing the rear HVAC housing from the right side of the vehicle.

The rear blower motor power module is connected to the vehicle electrical system through a dedicated lead and connector of the rear HVAC wire harness. A second connector receptacle receives the wire harness connector from the rear blower motor. The rear blower motor power module allows the microprocessor-based automatic temperature control (ATC) A/Cheater 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 rear blower motor feedback voltage. The resulting output drives the power module circuitry, which adjusts the voltage output received from the rear blower motor relay to change or maintain the desired blower speed.\

The rear blower motor power module is diagnosed using a DRBIII(R) scan tool. Refer to Body Diagnostic Procedures.

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