2002 LS1 into 1999 Silverado (5.3 orig.)

[bubba68ss]

Does the 2002 LS1 (156 OS) have a 128k output on Red 49 and also a serial data to BCM output on Blue 59? My diagram shows 'not used' on both and I am trying to direct swap into 1999 Silverado (originally 5.3 4l60e). Looks like the BCM wants serial data and ABS needs its data also. Does the Camaro not use 128k for ABS?

Harnesses are pretty much combined except for these two wires. I pulled the C2, C152 and C153 connectors off the truck harness and have grafted them into the LS1 harness pin for pin. I'm actually using a 2004 GTO harness which is DBC anyways. I've also swapped over the flat-four O2 connectors.

Hoping this is just plug and play and off we go.

[bubba68ss]

So I'm really wanting everything to work like it did with the 5.3 but I have to run a different tune for the LS1... Or do I? If I want AC to work how it should (I get I have to wire in the high and low pressure cut outs from the truck) and the abs to work AND the BCM to get its serial data, should I start with the original truck tune and manually copy paste in all the LS1 tables? Or will doing an engine segment swap from LS1 into the truck tune copy in all the LS1 parameters that I am unsure about (lack of 128k,lack of pin 59 serial data and three wire Camaro pressure sensor) and just put me back into the same position as if I'm starting with a LS1?