Durango 2WD V8-5.2L VIN Y (1999)
Blower Motor Relay: Description and Operation
SYSTEM DESCRIPTION
The blower motor relay 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 blower motor relay is located in the PDC in the engine compartment. Refer to the PDC label for blower motor relay identification and
location.
The blower motor relay cannot be repaired and, if faulty or damaged, it must be replaced.
High Speed Blower Motor Relay
The front blower motor electrical circuit uses a high speed blower motor relay. The high speed blower motor relay is an International Standards
Organization (ISO)-type relay. The relay is an electromechanical device that switches the blower motor to ground, bypassing the remainder of the
blower motor feed circuit.
The high speed blower motor relay is energized when the relay coil is provided a ground signal by the blower motor switch, and a battery feed
from the ignition switch. When the relay is de-energized, the front blower motor ground feed is routed through the front blower motor switch and
the blower motor resistor.
The high speed blower motor relay is located in the relay and fuse block, which is attached to the back of the junction block, under the left side of
the instrument panel in the passenger compartment. The high speed blower motor relay cannot be repaired and, if faulty or damaged, it must be
replaced.
