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Ok that is the test we really needed to find out. Normally this is caused by a faulty wiper cover. There is a chance though that you are having a short to voltage though. To check for this you will need to access the wiper motor cover is located on the back side of the wiper motor and test the purple wire. If there is no voltage at this wire, I would simply replace the wiper module. This is my feeling of what is happening, but I wanted to make you aware of that wiring test. Here is how to replace the wiper cover. Keep in mind that the wiper motor cover is the electrical device that controls all of the delay and speeds and so on. Feel free to contact me with any questions!
Important: To ensure proper wiper cover seal to wiper motor housing contact, the cover fasteners need to be equally tightened to the motor housing.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the outer bolt to 10 N·m (89 lb in).
Tighten Tighten the center bolt to 10 N·m (89 lb in).