I'm pretty sure it's just for debounce, so I don't think the exact value is critical. Maybe something between 0.2uF and 0.5uF? You could probably just add the resistors to test the input. Let us...

I found an XDF for 12587603 on NSFW's Github that has the A/C System type defined. I haven't checked it to know if the checksum is calculated properly. Be sure to verify it before flashing.

Here you go

I think you may have sent me the wrong file. The 2GCEK file is from a 2003 Silverado with a 4.8L and both files have OS 12579405

Nope, I found it. Yay!

It looks like I'm not going to be able to get those bins converted to HPT today. I can't find my HPT dongle. I think it may have fallen out the door of my step van :(

My guess is the resistor that is in place of the the capacitor is there just to keep the unused input low. The 3k is a pull down and the 100k resistor and capacitor are probably for debounce. I...

Nice work. I don't have the time to convert the bins for you today. I'll try to get them for you tomorrow

Sometime in the (probably distant) future, I'd like to examine the hardware, and verify that there is in fact a difference. It seems unlikely to me that GM would omit hardware for an input, unless...

Interesting, I was not aware of that. I don't believe the difference is related to the IAC drivers, but that doesn't mean that those service numbers don't have additional hardware differences in...

The IAC drivers are for the Idle Air Control stepper motor used on drive by cable throttle bodies. All of the PCMs use the A/C request input to control the A/C relay output. Different calibrations...