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The Toyota Prius Horn Relay is located in a car recognized for its unique hybrid engine. The Toyota Prius combines a gasoline engine of 1.8 liters with an electric motor, makes use of a silky continuously variable transmission and delivers excellently on fuel economy, allowing a drive past gasoline stations easily. Engineered for efficiency, the aluminum-bodied Toyota Prius offers agile acceleration, low emissions and a spacious interior for beginners, friends and gear. Regenerative braking adds to this efficiency. Thanks to strict quality control, Toyota parts are able to put up with long commutes and city stop and go traffic, making a Prius a smart pick for families wanting savings without sacrificing comfort. Within this efficient device, the Horn Relay carries out a straightforward yet important job. The horn circuit receives a low current signal from the steering wheel switch. The low current circuit closes a high current circuit, sending full battery power to the horn so the diaphragm vibrates and the horn makes a clear blast. The Horn Relay prevents heavy current from damaging sensitive controls in the steering column due to heat. Furthermore, the horn will sound instantly with each press or pull. Because age, moisture or engine heat can weaken contacts inside the Horn Relay, having it replaced quickly returns the confident voice every Prius driver relies on in heavy traffic. To install, disconnect the battery, plug the Horn Relay into the fuse box socket, reconnect power and test the horn.