Hi guys I’m new the the forum, I have 06 LLY that I bought a year ago. I have a switch and knob located under the dash and I have no idea what they do. One wire is missing off of the switch (black wire), and a red is connected. On the knob it has for positions and a grey wire is connected. The red and grey go to the ecm. Any thoughts on what these could be? I have pictures if I can figure out how to post them here.