Blower Motor Relay: Description and Operation

Blower Motor Relay:

The blower motor relay is a International Standards Organization (ISO)-type relay. Relays conforming to the ISO specifications have common physical dimensions, current capacities, terminal patterns, and terminal functions. 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 enegized when the relay coil is provided a voltage signal by the ignition switch. The blower motor relay is located in the PDC in the engine compartment. See the fuse and relay layout label affixed to the inside surface of the PDC cover for blower motor relay identification and location.

The blower motor relay cannot be adjusted or repaired. If the relay is damaged or faulty, it must be replaced.

When the blower motor switch is in any position except off, and the ignition is turned on, the blower motor relay is energized and provides battery feed to the blower motor from a fuse in the Power Distribution Center (PDC) in the engine compartment.

The blower motor relay coil is controlled by a voltage signal from the A/C-heater control.

The blower motor relay is installed in a wire harness connector located near the passenger side outboard end of the HVAC housing in the passenger
compartment, next to the HVAC wire harness connector.

Refer to the appropriate wiring information for diagnosis and testing of the blower motor relay and for complete HVAC wiring diagrams.