Question about Cars & Trucks
It sounds like the wiper parking position relay has failed. You see, when you turn on the wiper a series of relays on the actuator side are energized and cause the wiper motor to turn on and move the mono-wiper through its arc.
When it reaches the maximum extent of its travel, the wiper circuitry then reverses the arms direction and it swings back. This goes on until you turn off the wipers by turning off the ignition key or turning off the power switch.
When you turn off the wipers, the parking circuitry is activated. The central feature of this part of the wiper circuitry is the parking position relay. As the wiper begins to de-energize the parking position relay is activated. The position relay ensures that the wiper returns gently to the same position each time you turn off the wipers.
If the parking position relay weren't there, the wipers would park wherever they stopped on the windshield. However, the relay circuitry charges when you hit the off button and ensures that the wiper arm sweeps down to the same spot each time. If it does not activate, the wiper arm stops as soon as you turn off the power, as noted. This means that the wiper might, one time, stop in the center of the windshield or it might stop all the way to the left of right.
Aside from its complete failure, manufacturers build in telltales that indicate when the circuit is about to go. One of them is the wiper blade's parked position. Normally, the position relay ensures that the de-energized wiper circuit settles gently to the bottom of the windshield, as noted. However, if the position relay is failing most manufacturers have it park some distance from the bottom of the windshield to give you a head's up that the relay is on its way out.
Since the wiper circuits are fairly involved, it is best to leave it to a trained professional to do the work. However, if you feel you have the expertise to do it, your first step is to obtain the serviced manual for your vehicle. The service manual will give you the step-by-step repair procedure.
Since all parts of the wiper circuitry are related be careful, if you are repairing it yourself, that you replace each component according to the instructions as you might damage something else inadvertently.
Posted on Nov 12, 2014
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Posted on Jan 02, 2017
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