I've had both my headlight wiper motors (and most of the front end of the car!) off over the past wk to do a few jobs around the bumper, one of which was to repair the LH h/l wiper motor that had almost given up on me. Depends how far you want to go with repairing/replacing your motor unit, but I pulled mine apart to see what was happening inside the casing (I'm the type of guy who hates being ripped of for new parts by main dealers). Anyway after inspecting it for about 30mins with no obvious answers, it turns out there's a small carbon square between two copper contacts inside that just wanted turning around - don't know why coz it didnt look that worn or anything. Fixed it all back together and it worked fine!