High Speed Blower Motor Relay

SYSTEM OPERATION
Front
The front blower motor electrical circuit uses a high speed blower motor relay. The high speed blower motor relay is a International Standards Organization (1S0)-type relay The relay is a 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. See High Speed Blower Motor Relay in the Diagnosis and Testing for more information.

The front high speed blower motor relay is located in the engine compartment, on a bracket that is secured under one of the screws for the top cover on the inboard side of the heater-A/C housing. The high speed blower motor relay cannot be repaired and, if faulty or damaged, it must be replaced.

Rear
The optional rear heater-A/C unit blower motor electrical circuit uses a high speed blower motor relay The high speed blower motor relay is a International Standards Organization (IS0)-type relay The relay is a 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 rear blower motor ground feed is routed through the rear blower motor switch and the blower motor resistor. See High Speed Blower Motor Relay in the Diagnosis and Testing for more information.

The rear high speed 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 High Speed Blower Motor Relay Rear in the Removal and Installation for rear high speed blower motor relay identification and location.

The rear high speed blower motor relay cannot be repaired and, if faulty or damaged, it must be replaced.