simple story for a possibly not so simple issue. picked up my 06 MS6 last night.i noticed that the drivers side window controls are fully functioning. the button for my drivers window works fine both up and down... but the other 3 buttonsdo absolutely nothing. with the window lock on or off. i forgot to check each individuals doors buttons fto see if they worked or not but i will do that tonight. im thinking its possibly the entire unit in my door thats not functioning properly..any thoughts?