I have a 1999 Chevy s-10 Blazer 4x4 and I cannot put it in 4 wheel drive, the button on the dash is not lit up at all and nothing happens when I hit any of the 3 buttons, what's wrong???
I know there is an actuator under the
battery, and a plug on the transmission but
I have no light on at all on the switch in the
cab on the dash
Those lights must work as they are part of the circuit, you might want to test the bulbs for continuity, if thier blown the 4X4 electronics won't activate.
2 wheel hi light stays on most of the time, when I hit a hard bump it goes off. When I push the 4 wheel hi, or low button it blinks then goes out..... Why???
Okay, the most common failure is the transfer case shift motor, try having someone push the 4X4 button as you lightly tap the motor witha small hammer or wrench, if the motor runs and the 4 WD engages then you found your problem, replace the motor assembly, if it don't run then you will have to test the 4 WD activation control box and the wiring. I have seen quite a number of these have broken wires in the harness at the shift motor. HTH
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