This issue is commonly caused by worn out bushings in the wiper linkage. They are fairly easy to replace just pop out the damaged one and match it up with a new one and pop it back in.
Below is a pic of the replacement ones that come in a multi pack made by dorman
subaru wiper linkage
SOURCE: windshield wipers travel past the driver side window:
There is a tool for that, to take the spring tension off the arm
You can still wrestle it off, by lifting the arm off windshield
& on the arms right side & under it ,is a small tab you slide
out.
Then the arm comes off & you can reinstall in a different place
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Body control module (BCM)
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Wiper 1 relay
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Wiper 2 relay
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Wiper diode
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Windshield wiper motor
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Windshield washer pump
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Windshield washer nozzles
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Windshield washer solvent container
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Windshield wiper arm and blade assemblies
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Windshield wiper transmission
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WIPER/SW 10A fuse
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WIPER 25A fuse
Circuit/System Description
The body control module (BCM) controls the wiper motor based on input from the windshield wiper washer switch. The BCM monitors the wiper washer switch through three separate signal circuits and a ground circuit. The windshield wiper switch high signal circuit is used to determine high speed wiper operation, the windshield wiper switch low signal is used to determine low speed, intermittent, and mist operation through the use of a resistor ladder, and windshield washer switch signal circuit is used to determine washer operation. The windshield wiper motor park operation is controlled by the BCM. The BCM recieves an input from the park switch to determine wiper blade position. When the wiper blades are at the bottom of the windshield glass in park position the wiper park switch will open and the circuit will be pulled up to B+ by the BCM. The park signal will be pulled to ground by the wiper motor park switch while the wiper blades are not in the park position.
The BCM controls the windshield wiper motor through two output controls, controlling two relays which determine the desired wiper speed, high or low
Diagnostic Trouble Codes (DTCs)
The body control module (BCM) monitors the voltage on the windshield wiper switch signal 2 circuit for diagnostic purposes. If the circuit is shorted to voltage while the driver is commanded OFF, the BCM will store DTC B3715. If the circuit is shorted to ground while the driver is commanded ON, the BCM will store DTC B3715. Refer to DTC B3715.
It would be best to have a factory scan tool to diagnose this problem . it would make it easier anyway .
It
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You may have a worn wiper transmission linkage assembly. This normally is the result of turning wipers on with heavy snow on the windshield or ice build up causing the wipers to stick to the windshield. The wiper cowling will have to be disassembled for linkage assembly inspection
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