Since yesterday the door ajar light stays on and interior lights stay on a bit after engine is started. The lights even stay on a while after leaving vehicle and locking the doors. I do know that this is coming from the tailgate or window because the rear wiper won't work.

Now I do know there are no old style button light switches on these. I know it's some kind of sensor that does the job. The problem is that I do not know exactly where this is located or what exactly to look for (my Haynes manual isn't helping). Also, once I locate it, what should I look for as the cause and what I should do to fix it. Any help is greatly appreciated.