First off for the 2003 there is no GEM, so don't waste your time you just have a fuse box and a security module on the lower left right internal seating area PAssenger fender well. Secondly don't just spray the WD40 really work the doors open and close several time with some force as you are spraying them , you will need to do this to every door and both of the rear door and rear window. If doing it this way does not work it is likely the door switch on the drivers door is bad or the rear window as they are the most used | 
