Sorry, just seeing this but it seems like you got it figured out. It should just engage when the button is pressed but I believe there are speed limitations. I have accidentally activated it while wiping down the center console and the system is very active in the way it maintains a certain speed.I think I figured it out. I had to enable Hill Descent Control in both the IPC and ABS modules. At least it now notifies me on the IPC when I press the button. I need to find a nice hill to test it as I assume (wrongly?) that it won't engage on a flat area.
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