the same thing happened in the RS just last week man, took out the switch and cleaned it for starters, but still nothin, checked for voltage at the motor with switch depressed, and still had 12 volts, so it was the motor at fault. tried to get the motor out separately from the scissor assembly, but just couldnt do it, also the RS having frameless windows doesnt help as i couldnt tape them to the frame tp prevent the window falling when i loosened everything up.

in the end, i pissed it off to RMS, and they sourced a complete motor/reg/scissor assembly for me and installed it. no probs now. was about $150 for the parts i think. also, apparently power window motors can be DIY reconditioned, theres a thread around somewhere.