checked all wires cleaned WD-40 put back not erratic no more ,now it just rise when i start car for a few seconds then drops down to end ,took for a drive 10 mins never moved from botton even when engine warm ? before i strip out back internal pannels out any clues were the activating solenoid is ?Also founed another prob now sun roof wont work :-( whats next i wonder :-( FIXED SUNROOF WITH THE RESET INSTRUTIONS UDATE !!!
Easy enough to find directly behind lock ,2 bolts to remove i think, clean terminals and spray with wd40 worked a treat for me