4x4 not working, tcase motor?

[floridaoranges]

I have a 2002 ranger, when I turn the knob to put it in 4wd it does nothing. When I start the truck I see the 4x4 lights flash once. Does this mean the 4x4 control module is working? I've checked everything else and narrowed it down to either the module or the motor.

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edit: I fixed it by replacing the 4x4 control module.... thanks guys