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Hi. This is the second time this has happened. I had a service 4wd light pop up on dash and the indicator lights on the switch will not come on. The briefly light up when starting the vehicle but that is it. I replaced the 4wd switch and still the same result. Checked the fuses . Nothing there either. replaced the atc fuse also. Nothing. The last time this happened i simply unplugged the 4wd switch and plugged it back in and it worked fine for over a month after that. But this time nothing. Cannot get a code for it either. I read somewhere that if yo pill the #8 fuse while the engine is running and replace it 30 seconds later this will reset it but there is nothing labeling the #8 fuse under the dash. Any help would be greatly appreciated as I use the 4wd on a regular basis.
 

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mayb check into the speed sesors. I recently "fixed" a 2002 Silverado's 4WD by replacing his broken hub. Speed sensor wiring was ripped off. New speed sensor came with hub, plugged in and problem solved.I think you would get better answers asking in the 2nd Gen section. This section is for the 3rd gen 2019-2020 Blazers.
 

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mayb check into the speed sesors. I recently "fixed" a 2002 Silverado's 4WD by replacing his broken hub. Speed sensor wiring was ripped off. New speed sensor came with hub, plugged in and problem solved.I think you would get better answers asking in the 2nd Gen section. This section is for the 3rd gen 2019-2020 Blazers.
Ok. Thanks.
 
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