Standard Ignition TS-546 Engine Cooling Fan Switch

Engine Cooling Fan Switch for BMW and Nissan

Standard Ignition TS-546 is a 12-volt engine cooling fan switch built with a metal housing, round connector design, and 3-pin male terminals. It uses a plug-in attachment method and an open-at-idle switch configuration for direct replacement service on select BMW and Nissan applications.

Key Features

• Standard Ignition TS-546 engine cooling fan switch
• 12-volt electrical design
• Plug-in attachment method with 1 female round connector
• 3 male pin terminals
• Metal housing with black and gold finish
• Round switch shape with toggle actuation style
• Open at idle configuration
• Compatible with select BMW 318i, BMW 318ti, and Nissan Maxima applications

Detailed Description

The Standard Ignition TS-546 is an engine cooling fan switch used to control fan operation based on coolant temperature. It features a round, plug-in connector layout with a female connector and male pin terminals for straightforward electrical integration. The metal housing supports durable under-hood use, while the open-at-idle design matches the specified cooling strategy for the listed vehicles. This part cross-references URO 61318361787 for the same application.

For fitment-based searches, this part is a direct-match option for 1997 BMW 318i and 1997 BMW 318ti built to 2/97, plus 1992-1996 BMW 318i and 1995-1996 BMW 318ti with an 80 to 88 degree Celsius switch. It also fits 1989 Nissan Maxima with a 100 degree C switch on the upper radiator. Standard Ignition TS-546 is a practical replacement when the original cooling fan switch no longer triggers fan operation at the correct temperature.

What It Is Used For

• Restoring cooling fan activation at the correct coolant temperature
• Replacing a failed BMW 318i cooling fan switch
• Replacing a failed BMW 318ti cooling fan switch
• Replacing a Nissan Maxima upper radiator fan switch
• Addressing overheating caused by delayed or inconsistent fan engagement

Installation Notes and Tips

Verify connector style, terminal count, and temperature specification before installation. Confirm the vehicle build date for 1997 BMW 318i and 318ti applications, since the listed fitment applies to vehicles built to 2/97. Inspect the connector and surrounding wiring for corrosion or heat damage before plugging in the new switch. Use the vehicle’s cooling system service procedure to avoid installing the switch into a system with trapped air or low coolant.

Quality Assurance

Standard Ignition supplies replacement electrical components for service applications, and TS-546 is built to match the listed connector, terminal, voltage, and temperature-related fitment requirements.