Here is the new thread
What is this? Where is it? How can I replace it?
It's a "Generic Electronic Module". It controls a number of things, including: 4-wheel drive functions, wiper/washer function, warning chimes, keyless entry, power window functions, interior and exterior lighting functions...and more!
As soon as you buy that new Ford manual, you'll be able to identify it, test it, remove it and replace it. It's in Volume 1, section 419-10-14, "Removal and Installation, GEM (Generic Electronic Module)"