On my wife's 06' Highlander the driver side rear window does not go up or down with the switch. I can pull it up or down by hand. I can hear the motor run when switch is activated. I'm thinking it must be the regulator but am looking for any wisdom from someone who has worked through this issue. The H/L is one of 5 Toyota's in the family fleet and this is a problem I have not seen before. I do all my own work and can handle any mechanical work. I'm going to tear into it this weekend but ideally I'd have the parts needed in hand to fix if possible. Thank in advance for any help!