Welcome to the forum
I assume you are having a 4x4 related problem, since you replaced a part related to 4WD, what was the part number of that module?
Can you describe the problem?
Only 2WD, no shift to 4WD even though light comes on
Flashing 4WD lights when you try to shift
Flashing 4WD lights all the time
2WD and 4High work but no 4Low
When you first turn on the key 4WD lights should come on, testing the bulbs, then go off, does that happen?