Standard Ignition RY1878 Engine Cooling Fan Motor Relay

Engine Cooling Fan Relay for Honda and Acura

Standard Ignition RY1878 is a 12-volt engine cooling fan motor relay built for coolant fan relay control in select Honda and Acura vehicles. It uses a 4-terminal male spade design with no connector and no mounting bracket included, making it a direct electrical replacement for the original relay in the cooling fan circuit.

Compatible with 2014-2015 Honda Accord, 2017 Honda Accord, 2023-2025 Honda Accord, 2016-2021 Honda Civic, 2023-2026 Honda Civic, 2017-2025 Honda Ridgeline, 2022-2026 Acura MDX, and 2024-2026 Acura Integra. Standard Ignition RY1878 is also cross-referenced to 39795SJK004 and AR7382 for the same application.

Key Features

• Functions as a coolant fan relay for engine cooling system control
• 12-volt relay for automotive electrical systems
• 4 male spade terminals for direct circuit connection
• No connector included
• No mounting bracket included
• Relay contents only

Detailed Description

RY1878 is an engine cooling fan motor relay from Standard Ignition, engineered for vehicles that rely on relay-controlled radiator fan operation. In applications such as Honda Civic, Honda Accord, Honda Ridgeline, Acura MDX, and Acura Integra, the relay helps route power to the coolant fan circuit so the cooling fan can respond to temperature demands and engine operating conditions. The part number RY1878 is a practical OE-style electrical replacement when the original fan relay shows signs of wear or failure.

This relay uses male spade terminals and a no-connector design, so it is suited for vehicles with the matching factory terminal layout. The 12-volt specification aligns with standard passenger vehicle electrical systems.

Common Problems This Relay Can Address

• Cooling fan not turning on
• Intermittent radiator fan operation
• Overheating caused by relay circuit failure
• Fan staying on longer than normal due to relay malfunction
• Electrical switching issues in the coolant fan circuit

Installation Notes and Tips

Verify terminal layout, connector style, and relay location before installation. Compare the original relay to Standard Ignition RY1878 to confirm the 4-terminal male spade configuration and 12-volt rating. Inspect the fan fuse, wiring, and fan motor condition during diagnosis so the relay is not replaced without addressing the root cause.

Quality Assurance

Standard Ignition supplies automotive electrical components for replacement use, and this relay is built to match the specified coolant fan relay function for listed Honda and Acura applications. Confirm fitment by year, make, and model before ordering.