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Wiper motors have a homing switch. Usually located to keep motor running until Home is achieved, then discharge the magnetic field inside motor so that motor stops instantly. Intermittent wipers disconnect this swtich and pulse motor just enough so that this switch will keep motor running until motor gets back to homing position.
So which is it? Switch inside motor, control (or relay module) that activates motor even when switch is in home positions, or wires (connectors) between. Wiring schmatic is important and easily available. Could be any one of these. Quick use of a meter will identify where the 'home switch' and associated wire is broken.
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