Mine does lol one of the perks of the "0411 Swap" is you can add a momentary switch to ground pin 71 I think to put it in and out tow/haul mode. Has to be programmed into it though.
https://obdxpro.com/product/obdx-pro-gt-obd2-diagnostics-and-tuning/
This dongle works with Tech2Win and GDS2 and cheaper than the knock off mdi in an mdi2 housing. Just need a windows laptop and GM Software.
And that is my limited understanding of it been researching all of this myself lol, and yeah most engines don't have the selection of parts that SBC does.
I believe you can use LED bulbs that glow regardless of polarity and it will function as intended, will probably still hyperflash tho. I think they market those bulbs as ones that don't set codes in newer cars.
Above is usually rear wiper contol if its a SUV with tailgate/liftgate, below is pass airbag switch I believe only in trucks or could be foglight switch.
In my RCLB it had no provisions but, my ECSB did have the provisions. In the RCLB I had to center the front drill the hole for the front screw cut the legs off the back and center rear then put 2 screws inside the CD holder compartment.