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

asked by on November 10, 2017

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.

Electrical components are not working Inspection $79.99 - $99.99 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

Engine chirp chirp chrip

Most likely the noise is coming from the drive belt. You can try to spray some wd40 on the belt and see if the noise goes away since the belt may be dried out. If the noise does not go...

I have a misfire from cylinder 1and 5. I replaced the coil pack and all 6 plugs and still have the misfire codes P0132 and P0135

Hello. Check the crankshaft position sensor and the distributor for slop in the distributor drive next, which can cause mistiming and misfire issues as well. A certified technician from YourMechanic can come to your car's location to diagnose the misfiring...

I just used semi synthetic oil instead of full synthetic in my 1996 lincoln town car executive

Hi there. If you asked this question about 10 years ago - then yes, you might have issues with seals or gaskets wearing prematurely. However, as technology has improved, the gap between semi-synthetic and full synthetic is not as big....

I have a 1990 Jeep Cherokee with some weird stalling issues.

Hi there. Seems that the troubleshooting is leading to the transmission. When the vehicle goes into drive or reverse, if the transmission is lock up or the converter clutch is active, the engine will stall. When tapping on or turning...

My vacuum pump seems to be leaking water

Hi and thanks for contacting YourMechanic. Vacuum pumps are required to have oil in them for lubrication. If the pump is leaking water, then either the oil is the wrong type and is leaking out, or the pump has a...

Head gasket blown

Hi there. Common signs of a blown head gasket are: overheating, thick white smoke from the tail pipe, milky liquid in the oil cap or radiator cap, or loss of coolant. If you need assistance with an inspection or replacement...

Jeep Cherokee XJ has vibration noise when laying off gas

You'll want to pray that it is just a bad driveshaft universal joint. You can check this by jacking it up in the air, crawling under there and grabbing the shafts. You will then pull on them, and if there...

Temperature fluctuates up and down

The coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the fans to come on intermittently, all the time or...

Car rough idles sputters and jumps rpm after changing ignition coil cap and rotor.

Check the spark plug wires on the distributor and on the engine. It seems that you have one or more wires crossed and the engine is firing on the wrong stoke causing the engine to run rough and make the...

Related articles

The Best Used Cars to Buy for Dog Owners
Dog Dog owners are a special breed of drivers. When they shop for a used car they have a list of requirements that can be quite different from other drivers, which tends to make the process a bit of a...
2014 Jeep Cherokee vs. 2014 Jeep Wrangler: Which One Should I Buy?
SUVs are a crowded market, but Jeep has long been a name to remember. SUVs are generally built on the chassis of a truck and provide the overall handling of a truck instead of feeling more like a car that...
2014 Jeep Cherokee vs. 2014 Jeep Wrangler: Which One Should I Buy?
SUVs are a crowded market, but Jeep has long been a name to remember. SUVs are generally built on the chassis of a truck and provide the overall handling of a truck instead of feeling more like a car that...