I have a 2001 blazer blazer .4x4 was not working so I put in a new TCCM and checked all fuses and all i get is clicking from tccm unit in kick panel .all my lights work on control. 2hi is always lit when I hit 4hi 2 goes out and 4hi flashes and clicking from tccm but not transfer case same with 4low .lights flash and go back to 2hi I bought new 4WD Front Differential Vacuum Actuator and Transfer Case Switch but I don't think those are the problem cause still don't work . it worked fine last month and then nothing had no lights or clicking till I changed tccm .but now I still have no noise from transfer case could the tranfercase moter be bad .I do all the work my self cheaper then a shop.always have. But im.lost on this please any help Wil do. again its 2001 blazer Ls .

 

Was the TCCM new or used?

 

All new even have a new tranfercase mot coming just incase .

 

What were the original symptoms?

Did the old TCCM click at all? A lot?
Did the 4wd button panel seem to work as expected? e.g., the indicator lights changing as expected?
Did all appear fine but you only the rear wheels had power?

 

Everything worked fine then all of a sudden nothing no lights no clicking nothing .then changed the tccm and I had light and cliking grom tccm . But nothing from transfer case.it worked fine last week then I noticed no lights over the weekend

 

Dang, that sounds weird. I don't know what else to suggest except to get an OBD reader on it to see if there are any clues with any thrown codes.

BTW, is it a 4-button or 3-button transfer case? Did you get the correct TCCM for the type you have?

 

it's a 3 button and I got correct one and I bought a $300 video reader and no codes