When I push the 4x4 button on my 87 FSB nothing happens. I did the self check on the module and it is ok. It does not click & the 4x4 lights do not come on. How do I check the switch. What is the next sterp?

 

BScaff the 4x4 does not light up in your processor test , only the lights on your processor.Kick panel(passenger side )is a processor, unhook the two wire harness , turn your ignition on and push the square white button-, red light flashes , its the shift motor. stays bright-its the processor board , good luck. TR ps in this test its not hecking your switch , u can do a continuity test for that