Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Front/Rear Wiper Relay
- Check break contact.
Measure the resistance between pin 3 and 4.
Is the resistance less than 1 ohm?
If yes, GO to Step 2.
If no, INSTALL a new relay.
- Check make contact.
Measure the resistance between pin 3 and pin 5.
Is the resistance greater than 10 kohm?
If yes, GO to Step 3.
If no, INSTALL a new relay.
- Check relay contact in activated condition.
Connect the positive terminal of the power supply with pin 1.
Connect the negative terminal of the power supply with pin 2.
Measure the resistance between pin 3 and pin 5.
Courtesy of FORD MOTOR CO.
Does the relay switch audibly and is the resistance less than 1 ohm?
If yes, the relay is OK.
If no, INSTALL a new relay.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.