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You might want to try cleaning the door latch jaws on the drivers side with some electricle contact cleaner. This will give it a better connection. When the door is closed it will ground the circuit that makes the light come on and buzzer ding.
Bigrig is this about a 1995 Ranger?
If so I'll move this over to the Ranger forum.
The module you're wondering about sounds like the GEM (Generic Electronic Module).
1979ford Thankyou... I have not tried that yet.. It sounds like it may resolve the problem..
Racerguy.... Sorry abou that... I am a 1997 ford150 owner.. I asked this question not thinking... It is 4 my buddy.... He has to get registered here... I love this site