Tow/Haul button question

Its never been answered (atleast from what I've found on the net)... but has anyone wired up a BCM to get the tow/haul workikng?
The BCM's require programming from the facotry so if you had to program this thing could you through the OBD socket to our conversions? There is a write up on this same question on hptuners, but its for a LS1 computer and its different than our truck computers.
So if anyones gotten this feature to work, chime in.
clint

All you need is a momentary switch and wire it up. Mount the switch wherever you want it.

Could you give connector and pin numbers? From the research I've done it's a momentary ground going to the BCM and the BCM sends a message to the PCM over the Class2 bus