02 Trailblazer 4WD

Wife's trailblazer selector switch is dead. No lights, no changing to 4WD. I noticed this a couple of days ago when we were actually in the truck at the same time. About 6 months ago, we had the transfer case module replaced because it would intermittantly change the lights indicating what mode it was in, but not actually change the transfer case. Right now it is in 2HI and will not change, which is better than 4LO I guess. I have checked the fuse under the hood and the fuse under the rear seat and both are good. Any other things I might look at?

Reply to
Dirty White Boy
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Reply to
Shep

Thanks, Shep... I'll post again and let everyone know how it turned out.

Reply to
Dirty White Boy

Reply to
pika

Since the Trailblazer uses the databus (or something like it - can't remember the term exactly,) Does anyone know if you can use a DMM to check, or does it have to be plugged in?

Reply to
Dirty White Boy

"plugged in" meaning to the dealer diagnostic tool...

Reply to
Dirty White Boy

Reply to
pika

I believe it depends on the transfer case you have. The Auto 4X4 one needs a scanner but the manual box can be jumpered. Pin 13 on the ALDL to ground and watch the lights on the switches to read the codes. The S blazers are that way and I think the TB uses the same box.

Reply to
Steve W.

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