Standard Ignition RY-318 Horn Relay

Horn Relay for Toyota and Lexus Applications

Standard Ignition RY-318 is a 12-volt horn relay with a female rectangular connector, three male blade terminals, and a relay-only contents package. It is built for direct replacement use in a wide range of Toyota, Lexus, and select Geo applications where the horn circuit needs a dependable electrical switching component.

Key Features

• 12-volt horn relay for automotive electrical systems
• Female rectangular connector with one connector interface
• Three male blade terminals for relay circuit connection
• Relay-only contents for service replacement
• Standard Ignition RY-318 replacement part number
• Cross-references Four Seasons 20117 for the same application

Detailed Product Description

Standard Ignition RY-318 is a horn relay used to control horn circuit operation in vehicles that require a 12-volt relay with a rectangular female connector and three blade-style male terminals. This part number is listed across multiple Toyota and Lexus platforms, including 1991-2000 Toyota 4Runner, 1995-2000 Toyota Avalon, 1996-2000 Toyota RAV4, 1992-1996 Toyota Camry, 1995-1996 Toyota Corolla, 1998-2003 Toyota Land Cruiser, and 1998-2003 Lexus LX470. It also applies to other listed vehicles such as Toyota Tacoma, Toyota T100, Toyota Supra, Lexus LS400, Lexus ES300, Lexus GS300, Lexus SC300, Lexus SC400, Toyota MR2, Toyota Celica, Toyota Paseo, Toyota Tercel, Toyota Pickup, and 1993-1997 Geo Prizm.

Use Standard Ignition RY-318 when replacing a horn relay that matches the same connector style, terminal layout, and 12-volt electrical specification. The part number RY-318 is also referenced in aftermarket interchange listings for service matching.

What This Relay Helps Address

• Horn inoperative due to relay failure
• Intermittent horn operation from worn relay contacts
• No-click condition in the horn circuit
• Electrical switching faults in the horn relay circuit
• Replacement needs for Toyota and Lexus horn relay service

Installation Notes and Tips

Verify the connector shape, terminal count, and voltage rating before installation. Match the existing relay footprint and terminal orientation to the vehicle’s original horn relay location. Because mounting hardware and a mounting bracket are not included, reuse the original mounting setup if the application requires one. Confirm the vehicle’s horn circuit diagnosis before replacing the relay to avoid unnecessary parts replacement.

Quality Assurance

Standard Ignition supplies this relay as a service replacement electrical component for listed Toyota, Lexus, and Geo applications. The RY-318 part number is supported by multiple interchange references, including Four Seasons 20117, for application matching.