Q: How to tell if wiper switch or wiper relay is bad to fix wipers not working.

asked by on

How to diagnose if it is the wiper switch or wiper relay that is bad causing wipers to not work. ( Already replaced wiper motor turn signals work fine .

My car has 150000 miles.
My car has an automatic transmission.

If you suspect the relay, power the relay solenoid directly with twelve volts. Then check for continuity across the relay switch contacts. If no continuity, as the solenoid is powered, then the relay is bad. If you suspect the switch, simply turn the switch "on" and check for 12 volts from the switch output to any body ground. If 12 volts are not measured, then the switch is bad. If there is a failure in the circuit, a Mechanic would trace it, using the wiring diagram in the Factory Service Manual, find the wiring, ground, termination or device fault that has caused an interruption in power and repair it. If you want the required steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an electrical circuit/component diagnostic and the responding certified mechanic will get this resolved for you promptly. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. How to tell if wiper switch or wiper relay is bad to fix wipers not working.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: when i start my 2001 jeep Cherokee up, there is an electronic humming sound

Hello, thank you for writing in. Walking through the diagnostic process, we can rule out the wheels and suspension as a cause for the humming, as it happens as long as the car is running. The next step is attempting...

Q: Hit curb. Control arm bent.

The best thing to do is to have a body shop with a frame straightness check machine to quote the repairs for your vehicle. If you have full coverage on your vehicle insurance then now would be a good time...

Q: Vehicle, smoking, popping, and stalling when starting.

What color is the smoke that is coming out of the back of your van? The color of smoke can help tell you what is going on. If the smoke is a bluish color your engine is burning oil. If...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...