you need to remove the glass..the bolts for this are behind 2 little foam covers..there is a bead of pre-set sealer which you gently prise away from the door..then lift the bottom of the metal panel up and out, then pull the lot down..this is because the tracks for the glass mechanism are longer than the hole in the door, hence the need to 'wriggle' it out.. you will then need to remove the wiring to have full access to inside of the door..hope that makes sense, thats the best way i can explain it