I just purchased a New Interior motion detector switch, because mine wasn't lighting up or working when i pressed the button. So I put in the new switch and it still does not work. Is there some type of fuse that needs to be replaced? or is it because my door latch isn't working? If there is a fuse what number and would it be interior or engine compartment?

And as far as my door latch is, if i need to replace it what size torque bolt would i need to get the bolt out? it looks like a 12 spline T40 i am not sure though. Where would i beable to buy one? ebay or dealer or local parts store?