Windshield Washer Relay

What Is a Windshield Washer Relay?

The windshield washer relay is a small but critical electrical component that acts as a switch between your vehicle's control module and the washer pump motor. When you operate the washer switch, it sends a signal to the control module — such as the body control module (BCM) — which then energizes the relay to operate the windshield washer pump, pushing fluid through the hoses and out through the washer jets. Without a properly functioning relay, that signal never reaches the pump, leaving your windshield without the fluid it needs to stay clear.

Why the Washer Relay Matters for Visibility and Safety

Driver visibility is one of the most fundamental aspects of road safety, and the washer system is a key part of maintaining a clear view through your windshield. The system activates the windshield wipers automatically for a few seconds after the cleaner sprays, because this avoids any dripping of excess rinse product on a just-cleaned windshield. A failed relay disrupts this entire chain of events.

As with any electronic component, the relay can fail completely or only on one circuit — for example, your wiper relay could be bad if the low and high speed wiper positions function properly but the intermittent function stops working. Any combination of positions working or not working is a good indication of a faulty relay.

Dirt and moisture can damage the relay housing over time, and corrosion can prevent the metal contacts from touching each other — so symptoms of a failing washer relay can sometimes be intermittent before the component fails entirely. Catching the problem early can prevent the frustration of a completely non-functional washer system on a rainy day.

What to Look for When Shopping for a Windshield Washer Relay

Because relay designs vary by vehicle make, model, and year, fit and compatibility are the most important factors when selecting a replacement. Look for parts that are confirmed to match your vehicle's specific wiring terminals and connector configuration. Key specs to check include voltage rating (typically 12V), amperage capacity, number of terminals, and connector shape — all of which must align with your vehicle's original equipment specifications.

• Voltage: Standard automotive relays operate on a 12-volt system
• Terminal count and layout: Must match the original relay footprint for a direct-fit installation
• Contact material: Relays featuring brass or copper contacts where specified offer extended wear resistance, ensuring reliability even in high-stress applications
• Certifications: Relays manufactured at TS16949 and ISO9001 certified facilities meet the highest industry standards for quality

Top Brands for Windshield Washer Relays

When it comes to replacement windshield washer relays, Standard Motor Products is one of the most trusted names in the category. Their Engine Management segment manufactures and distributes a full line of critical components for the ignition, electrical, emissions, fuel, and safety-related systems of motor vehicles. As a global manufacturer of original equipment ignition products, Standard Motor Products maintains complete quality control throughout the manufacturing process from componentry to finished product — giving DIYers and professional technicians confidence that the replacement part will perform to OE standards.