All,

I believe I have found out another little interesting bit of info with the LS1 swap. It looks as though hooking up the cruise control will be a bit more than just reconnecting the wires from the steering wheel to the PCM.

Cruise control on the LS1:
3 switches: ON/OFF, SET, RESUME. Each of these ground out a separate line on the PCM when they are pressed.

Cruise control on the Solstice (possibly same as LS2):
3 switches: ON/OFF, SET, RESUME. However, there is only one wire going to the PCM for these signals. Each one grounds out the same line through a different resistor (different resistor values as well). This in turn signals the PCM (probably going into an analog-to-digital converter) and the PCM knows which button was pressed by the voltage that is present, ex. ON/OFF 1.5V, SET 2.5V, RESUME 4V.

I am not going to hook up cruise just yet as I don't really use it that often. However, it should be relatively easy to mod the steering wheel controls. I have already taken one apart and I think you can mod the circuit board to add the additional wires. But, this would require removing the air bag to pass the wires through the steering column properly.

Again, I'm not certain yet, but this is what it looks like.

-Adam