take your gauge cluster out and on the back on the passenger side all the way at the top is a door open warning light, take a bulb from the air bag or other useless light and put it in that hole, put the gauge back in for a minute, open the door and turn the car on. if the bulb lights up, close the door and see if it turns off. mine didnt have a bulb so i dont know if that spot even works. but worth a try before chopping into stuff. and if you need door switches I got em.