passenger power window only works when I bypass switch on both sides

03 tundra passenger window motor quit (during a rain storm with window open) drivers side and pass side switch not working. Window only works up & down if I bypass switch at motor connection when I ground one wire and power other wire with 12V. Should there be continuity between motor housing and ground? In my case there is none. Is there a relay that may be faulty while working on door I could hear an occasional squawking or electrical sound? thanks for any help you may provide.  warren