RAM 1500 Van V8-5.9L VIN Z (1998)
Blower Motor Relay: Description and Operation
Blower Motor Relay
SYSTEM OPERATION
Front
The front blower motor relay is a International Standards Organization (ISO)-type relay. The relay is a 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. See Blower Motor Relay in the Diagnosis and Testing for more information.
The front 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.
Rear
The blower motor relay for the optional rear heater-A/C unit is a International Standards Organization (ISO)-type relay. The relay is a
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. See Blower Motor Relay in the Diagnosis and Testing for more information.
The rear blower motor relay is located in a connector that is secured to the back of the rear heater-A/C unit housing in the passenger
compartment. See Blower Motor Relay - Rear in the Removal and Installation for rear blower motor relay identification and location.
The blower motor relay cannot be repaired and, if faulty or damaged, it must be replaced.
