Suburban

There are several components to the system,
1 the switch itself
2 tccm transfer case control module
3 tcem transfer case encoder motor
the tccm is serial device so a reguar code reader cant check it, ive seen every part fail, not all at once, best advise is have it scanned for codes (the tccm) and see what happens
you can replace the switch and rule that out if you want, they are 25-30 bucks and install in minutes, but I am a big fan on diagnosing the problem and fixing it right the first time,
one question I would like to ask is, when you start the vehicle do all of the lights on the switch blink then go out and one stays lit?

Thanks
jim