1A1 looks promising.. I think it's more A/c clutch applied/A/c clutch not applied, not the request your looking for.. I can confirm the 1A1 messages are the status for the "A/C Clutch Engaged" (on or off) 1A1 - 00 2 00000 = status on 1A1 - 00 3 00000 = status on (when on via scan tool) 1A...

I didn't think/know you were using the BCM.. This might throw a wrench in the works for the a/c request but I'm not sure.. I have the BCM but not sure if I want to run it as I cant seem to get the things I want from it: I was hoping to get reverse lights, ac request, tutd, cruise and variable charg...

For anyone interested the PRNDL. Message id's with ID 1F5 have the PRNDL shifter status (great to know if you 6l80/T43 tcm sends reverse status over gmlan) byte 4 is the status 1F5 0F0F00 01 00000300 - this is Park 1F5 0F0F00 02 00000300 - this is Reverse 1F5 0F0F00 03 00000300 - this is Neutral 1F5...

What else do you have available besides hptuners? Do you have a gm MDI? can you monitor a/c request with hptuners? that should change from no to yes when sending that command, that is what I am seeing with tech2win.. hptuners has the following channels that can be monitored. -AC Clutch Engaged -AC ...

I initially thought you were referencing the device control messages (the 0xAE in the 1F1 messages through me off track): -7E0 07AE203000000000 AC clutch on -7E0 07AE200000000000 AC clutch (standard) -7E0 07AE202000000000 AC clutch off I suspect the 1F1 addressed messages you suggest are the ones I ...

Thanks for for sharing the suburban log. Very helpful! In fact, on initial glance it does look very similar to my log but I need to do some more digging. What year are you trying for? Targeting the 2011 E38 for the L77 6.0 - OS 12639270 1F1AE1600000800007A << this turns the ac clutch on in the subur...

Does anyone have any canbus data they can share? Especially keen for VE commodore? I am currently doing an L77 VE Holden Commodore engine conversion (without BCM) into a holden rodeo and I am trying to learn what all the messages are. The GMLAN bible doesn't really cover the 11 bit HS can much so I ...