Kodiak AC configuration

[turbo_bu]

Not sure where to put this, but I am working on trying to understand the differences between the standard Silverado AC system and what is used on the Kodiak trucks. Looking at the code shows that these two different systems utilize different inputs. The Silverado's typically had a low and high pressure switches and went from a dedicated 12 volt ac request signal to a Class II signal. Does anyone know roughly how the Kodiak AC system was setup to interface with the ECM? Or has a wiring diagram showing the inputs that were used to control it?

 

[hhh217]

When I installed a LLY in my 02 truck I went down this road to get the LLY ecm to control the a/c in the truck. https://www.gmupfitter.com/
Check out gm upfitter. They have schematics for the medium duty trucks.

 

[turbo_bu]

Thanks, yes I have used them before. Unfortunately, I didn't see a wiring diagram for a 2002 truck. I found the 2004+ ones listed. And they seemed to help. But wasn't sure if there were some differences for the 2002 vs. the 2004 like there are on the Silverado's.

 

[hhh217]

The new body medium duty trucks started in 2003 or 2004 I think 2003 that offered the duramax. 2002 was the older style cab and didn’t have a duramax.