Ford Repair: door jamb, ford f150 crew cab, wd 40

Question
where would i locate the door jamb on my 02 ford f150 crew cab, the chimes keeps going on and the dome light stays on?

Answer
the switch is located in the latch in the door-you can probably spray liberal amounts of wd-40 in the latch on the door and open and shut the door several times doing both lube and open and shut and that will probably fix it if not the switch may be bad. this happens a lot after washing the truck or after rain also.