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Hello All,
Glad I found this forum, and hello to all! Searched already and found a wealth of information from a very knowledgible group!! I am experiencing some issues as many others have, with my wife's 2002 Trailblazer. I r&r'd the 4X4 selector switch and disco'd the battery as others suggested. So now the results are, indicator lights come on at start-up/prove-out but not during normal running/driving operation, also the selector is not changing the driveline function. I looked in the Haynes manual and it said replace the modulator in the dash console and some folks here suggest replacing the actuator. I do get 4X4 when selected with key off then on and back again. Would anyone know how to troubleshoot this system? I am not an advocate of just throwing parts at a problem.
THANK-YOU
mercmech

P.S. If this were a Mercury Outboard I'd have it fixed by now...
 

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2003 gmc envoy_slt
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Not sure about your problem, but... :tiphat Welcome :tiphat The Roadie is the one to help. Until his return, start using the Search button. You may be able to find the problem/fix.
 
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