Dakota 4WD V8-4.7L VIN N (2000)
Blower Motor Relay: Description and Operation
BLOWER MOTOR RELAY
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.
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 for more information.
Blower Motor Relay (VRR) Location
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 left-
side energy-absorbing bracket. 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.
