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When windshield wipers do not operate in the interval position, the first step in the diagnostic process is to measure the resistance at terminals R1 and R2. This action is essential because the interval wiper function typically relies on specific resistance values at these terminals to determine the correct timing for the wipers to pause between sweeps. If the resistance is outside the expected range, it indicates an issue with either the wiper switch or the interval governor that controls this function.
By checking resistance at these terminals, the technician can identify whether the issue is related to the control signal being sent for the interval operation. This measurement helps narrow down the problem, whether it's due to a faulty switch, connection issues, or a malfunctioning interval governor. Understanding and interpreting these resistance readings is crucial in correctly diagnosing and resolving the issue efficiently.
Other troubleshooting steps, such as checking fuses or looking for open circuits, may arise later in the diagnosis as the technician eliminates potential causes. However, assessing resistance at R1 and R2 provides immediate insight into the functionality of the interval feature.