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Below is the number on my PCM. I'm trying to determine if it is compatible with the IAC drivers drivers. It's from a 2004 Avalanche, but I want to have it reprogrammed to accept the AC request like the Express Van did. I've searched and I can't come up with a definitive way to know if what I have will work. Does anyone know of a website or a way to find out for sure?
I can confirm - Service #12586242 is a 2004 Truck PCM which does NOT have the IAC driver in it. For 2004, the PCM which has the IAC driver in it is Service #12586243.
Correct, the 04 Avalanche has a DBW setup, and does not support IAC. You would be better off with a Express van pcm especially if you want the a/c setup. If you need one, pm me, I may be able to help you out.
To follow up, here's the list of PCMs with the IAC driver installed:12200411 – xxxxxxxx – 2002 F-Body, Corvette, S10, IAC DRIVERS INSTALLED
09354896 – xxxxxxxx – IAC DRIVERS INSTALLED.
12576106 – 12570558 – 2003 G-VAN, LM7, IAC DRIVERS INSTALLED. ALSO C-TRUCK LM7 12582605 – 12580786 – 2003 C-MPV, L59 12586242 – 12583660 – 2004 C/K-TRUCK, LM7 12586243 – 12583659 – 2004 GTO LS1, IAC DRIVERS INSTALLED 12589463 – 12589162 – 2005 C/K-TRUCK/MPV, LM7, LQ4 12589462 – 12589161 – 2005 G-VAN, LQ4, IAC DRIVERS INSTALLED 12589463 – 12589162 – 2006 C-PICKUP, LM7
12602802 – 12589162 – 2006 C-PICKUP, L59 12602801 – 12589161 – 2006 – 2007 Express, Drive by Wire, IAC DRIVERS INSTALLEDGreen = IAC Driver Circuit Present Red = IAC Driver Circuit NOT SUPPORTED
RPTurbo, you said you have a 12586243. If that were an express van and originally used drive by cable, could I have the PCM reprogrammed to DBC? I've found lots of threads pertaining to converting DBW to DBC, but not many the other way around.
If that were an express van and originally used drive by cable, could I have the PCM reprogrammed to DBC? I've found lots of threads pertaining to converting DBW to DBC, but not many the other way around.
Confused - if it "originally used drive by cable", why would you need to have the PCM reprogrammed to DBC (drive by cable?) Did you mean converting the original van DBC set up to DBW?
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PCM compatible with IAC drivers ? 
