Operation - Rear

OPERATION

The rear blower motor resistor is connected to the vehicle electrical system through a dedicated take out and connector of the rear HVAC wire harness. The rear blower motor resistor has an electrical circuit board with two resistors, each of which will reduce the current flow through the rear blower motor to change the blower motor speed.


The blower motor switch in the manual temperature control system directs the ground path for the rear blower motor through the correct resistor to obtain the selected speed. With the blower motor switch in the lowest speed position, the ground path for the motor is applied through both resistors. Each higher speed selected with the blower motor switch applies the blower motor ground path through fewer of the resistors, increasing the blower motor speed. When the blower motor switch is in the highest speed position, the blower motor resistors are bypassed and the blower motor receives a direct path to ground through the blower motor switch.


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