Check your owners manual. If you don't have one copy & paste this link. http://www.genuineservice.com/genuineservice/en/gloveboxresults
If its like my 2003 Expy, the relay for the rear wiper motor also controls the rear hatch lock
I believe it is on the turn signal lever , towards the inner section of the lever
where does the wiper fluid go in a expedition ======================================================== In a Ford Expedition : The windshield washer fluid reservoir for the windshield ( located in the engine compartment ) also supplies the rear liftgate
It controls the power to your wiper motor.
There is a flasher relay that is located besides the blower motor relay, located under driver side dashboard along side of steering wheel column. But if you're having turn signal problems, check you're Multi - Function switch which is located under the ignition key cover, it's split in two halves. Easy to change, but cost about 85$. it controls directional signal's, wiper speeds, stop lights....etc.
You can find your 1999 Ford Expedition front windshield wiper fuse in the fuse box. The windshield wiper fuse will be in the second column, fourth from the top.
That depends on what you're calling the "control module". There is a switch that controls where the wiper blades "park". It's inside the wiper motor assembly. In fact, most of the controls, except the switch on the steering column, are inside the wiper motor.
Could be he wiper motter or the fuse.
ITS WITH THE WIPER MOTOR ITS ALL ONE UNIT
2000 expedition wipers & radio don't work when in drive
The 1998 Ford Expedition had a mid-year production change which affected the wiper system. See sources and related links below for the best explanation of how to determine correct wipers.
It controls the intermittent wipers