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I have a 2004 Colorado w/4 wheel drive. The TCCM is not working and I think I know which component failed. I was wondering if someone has a schematic of the TCCM so I can verify I am replacing the correct part.
 

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there ae 2 modules, one on the front axles and one on the transfer case. You can use a volt meter or crawl under and listen when some one pushes the button to see if you hear either one click/activates. or disconnect on and see if you hear the other one activate

I googled and there are pictures of schematcis for the tccm wiring,

 
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