Problem with windshield wipers

Hello, You may have an issue with the body control module or the park switch. You will want to get the wiring diagram for the vehicle, a test light, and a multi-meter. Since this is an intermittent issue, you will need to ensure the problem exists, test for signal from the wiper switch at the body control module, and see if the body control module is powering the relays. This is not the most friendly circuit to diagnose if you are not used to diagnosing electronic circuits, just FYI.