Blower motor. Blower motor relay

Blower motor

FRONT

DESCRIPTION

The blower motor and blower wheel are located in the passenger side end of the heater-A/C housing, below the glove box. The blower motor controls the velocity of air flowing through the heater-A/C housing by spinning a squirrel cage-type blower wheel within the housing at the selected speed. The blower motor and blower wheel can only be serviced with the heater-A/C housing removed from the passenger compartment.

OPERATION

The blower motor will only operate when the ignition switch is in the On position, and the heater-A/C mode control switch knob is in any position, except Off. The blower motor receives a fused battery feed through the blower motor relay (Voltage Reduction Relay or VRR) whenever the ignition switch is in the On position.

The blower motor battery feed circuit is protected by a fuse in the Power Distribution Center (PDC).

The blower motor relay control circuit is protected by a fuse in the junction block. Blower motor speed is controlled by regulating the ground path through the heater-A/C mode control switch, the blower motor switch, the blower motor resistor, the blower motor relay (VRR), and the high speed blower motor relay.

The blower motor and blower motor wheel cannot be repaired and, if faulty or damaged, they must be replaced. The blower motor and blower wheel are each serviced separately.

REAR

DESCRIPTION

The rear blower motor and blower wheel are mounted to a blower wheel housing located inside the rear overhead A/C unit, above the headliner. The blower motor controls the velocity of air flowing through the overhead A/C unit by spinning a wide squirrel cage-type blower wheel within the housing at the selected speed. Rear blower motor speed is controlled by regulating the ground path through the rear blower motor switch and the rear blower motor resistor.

OPERATION

The rear blower motor will only operate when the ignition switch is in the On position. The rear blower motor receives a fused battery feed through a fuse in the relay and fuse block whenever the ignition switch is in the On position. The relay and fuse block is attached to the back of the junction block, under the left side of the instrument panel in the passenger compartment.

The rear blower motor, blower wheel, and blower wheel housing cannot be repaired and, if faulty or damaged, they must be replaced as a complete factory- balanced unit.

Blower motor relay

DESCRIPTION

The blower motor relay (also referred to as Voltage Reduction Relay or VRR) is an International Standards Organization (ISO)-type relay. The relay is an electromechanical device that switches battery current from a fuse in the Power Distribution Center (PDC) directly to the blower motor. The relay is energized when the relay coil is provided a voltage signal by the ignition switch. This arrangement reduces the amount of battery current that must flow through the ignition switch.

OPERATION

The blower motor relay control circuit is protected by a fuse located in the junction block. When the relay is de-energized, the blower motor receives no battery current. The VRR is used to reduce blower speeds in Heat mode. In non-A/C modes, the relay is de-energized and switches the current flow through an added resistance in the resistor block. When an A/C mode is selected, the relay is energized and the normally open contact is used to bypass the added resistor. The fuse is located in the small relay fuse block that is attached to the Junction Block. The relay is energized by grounding the coil low side with the HVAC switch in any A/C mode. See Blower Motor Relay in the Diagnosis and Testing section of this group for more information.

The blower motor relay is mounted with a single screw directly to the instrument panel's structural plastic inside the glove box opening, next to the leftside energy-absorbing bracket (Fig. 1). Refer to the PDC label for blower motor relay identification and location.

The blower motor relay (VRR) cannot be repaired and, if faulty or damaged, it must be replaced.

Fig. 1 Blower Motor Relay (VRR) Location

1 - BLOWER MOTOR RESISTOR CONNECTOR

2 - BLOWER MOTOR RELAY

3 - BLOWER MOTOR CONNECTOR

4 - GLOVE BOX LAMP CONNECTOR