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I also have need of that information. I know where the Data wires are but I am unsure of what the ground reference for the data is. Is there a digital ground or is everything referenced to the chassis?
 

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Does anyone have wire schematics and or pinouts for the bcm on an 06 colorado, I cant seem to find any info on where to hook up the second serial data wire from the 2000 pcm im using for my 5.3 swap to make the gauges work. Im told the odometer mslfunctions with this setup but thats the least of my concerns
I am sorry, I do not. However I have found that if you know someone in a Repair shop, many of them subscribe to a service that allows them to print out the wiring diagrams. The ones that I had for the 2005 Colorado were different than the ones for the 2006. Sorry I could not help.
 
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