Easy as pie,
So, remove the door handle frame (just pry out is held in 6 spring loaded clips – 3 on to and 3 on the bottom). Be careful don’t apply more force than required (just apply force gradually until it snaps starting from a corner). Then don’t pull to much away the trim because there are 2 wires attached in the back - one to the door lock switch and another to the little light under the door handle).
Then take the switches module out (start from the back edge, insert a sharp tool between the switch module edge and the door panel pull forward and up to release), no need to disconnect the wires. Now on the lower back corner of the opening in the door panel under the door handle plastic frame inside locate a Philips head self tapping screw holding a bracket attached to the door panel. Take that screw out.
Now aim your attention to the triangular plastic trim on the inside side of the mirror. In the middle of that trim inside is a plastic clip (same idea as the clips holding the trunk lid liner). Pull the top tip (carefully and slowly) to pry the clip out of the door and release the plastic trim. But that plastic is not going out, the lower edge (on the inside) is attached to the door panel (so just release the triangular plastic trim from the door –should be obvious when the clip is out).
Now all it holds your door panel attached to the door are about 7 – 8 hooks pointed down and inserted in some slots in the door. So in order to release the door panel you need to PULL UP (understand PULL UP) for about 1 inch and then slightly inside (as in inside the car – as in pull the door panel away from the door) but please do understand PULL UP first (and then up and slightly away).If you don’t pull UP you will break 2-3 hooks (trust me). So please understand PULL UP first to raze the panel and the hooks out of the slots then pull away. The hooks are as I mentioned about 1 inch long so the panel should lift about that distance before pulling up and away.
So the door panel is loose but still can’t be detached fully because of the switches module and wires. You have to push the module thru the hole (that strip can bow slightly – you will see).
To mount follow the same steps but in reverse.
Also fill up in your UserCP the year and model of your Cadillac, helps people to help you better.
By the way the motor is held in 3 screws (easily accessible with the panel out). But you might have alignment issues of the rail. There are 2 adjustments screws down in the door (M10) at the bottom of the front and back rail.
