I have a 99 jimmy 4.3 with the four button selector for 4x4. The atc fuse under the hood blew once. I replaced it and it has not blown since. the service four weel drive light is on, I have a u1026 code. and also do not hear the tccm clicking anymore when the key is turned on. I also have a front wheel bearing that is growling, as far as I know that shouldn't disable the 4x4. As for the lights on the selector buttons they only flash for a very short instant when the key is turned on any help would be greatly appreciated.

 

update: I also noticed this week that my air conditioning will not turn on either. the light just flashes. Does a bad tccm also control something with the ac.

 

is there any way to engage the 4x4 easily manually.

 

This thread may be helpful to you https://blazerforum.com/forum/tech-a...rmation-41198/