2003 Chevy Silverado 1500HD problem?

Kardashian

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I own this Chevy model truck, It has a auto 4 wheel drive push button, 2 wheel drive push button, and 4x4 high and 4x4 low button, there located on the drivers left side on the front panel, When i push the 4x4 high and 2 wheel drive the thing blinks a couple of times, and goes right into gear and stops flashing on the button. Now when i press 4x4 low it just keeps blinking and never stops. I never got a manual, what is the problem? why does it just keep blinking? HELP? Does that mean it doesnt work?
 
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