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.
Low Speed Operation
With the wiper switch in the low position, the body control module (BCM) detects a signal in the windshield wiper switch low signal circuit. The BCM then applies voltage to the WIPER relay control circuit. This energizes the WIPER relay and allows voltage to be applied through the switched contacts of the of the WIPER relay to the normally open switched contacts of the WIPER HI relay. Voltage is then applied from the WIPER HI relay normally open contacts to the low control circuit of the windshield wiper motor.
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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.