would a wiring diagram help you?
Do you have a voltmeter and can you use one?
Ok sorry for the late reply. Sort of called it an evening.
Here is a diagram and I will help you through diagnosis to see if you can locate the failure.
It is easier to test this circuit from the fan relay module. Key on (not necessary) look for power and grounds to be intact. Then jump pins #1 and #2 together the fan should run.
Let me know how you do