'03 door ajar sensor

My '03 Eddie Bauer has a small problem that I do not know where this sensor is. THe driver side rear door sometimes say's it is ajar when it is not. I wouldn't care if my lights didn't stay on for an extended time. My question is where on the door is the sensor and how easy is it to replace?

The sensor is inside the door on the latch. You may be able to spray penetrating oil in the latch and allow the light to go off.