So for the past year or so my 2010 LX has not been able to engage 4 low. I found the problem. So I took a close look at the switch unit and found that the little plastic pin that moves the contact was stuck in it's bore. Found a good amount of sticky substance (coffee or soda) in the switch area. I took it apart and pulled the white pin and cleaned it and the hole it goes into. Unfortunately the rocker switch has a piece broken that would normally run against the tip of the white pin to move the contact for 4 low. I was able to press on the pin with a screwdriver and what do you know the 4 low engaged instantly and disengaged when releasing the screwdriver. So I will either order a new or used switch assembly and be back in business. Also of note my usb stopped working a couple months ago and I traced that down to some sticky soda or something on the connector. After cleaning the CONNECTOR with electric cleaner and plugging/ unplugging several times that is working too. And to think I needed a transfer case actuator (sometimes we get lucky) I have never spilled in this truck but the previous owner must have (probably due to our shallow cupholders LOL). Anyway figured this might help some of you guys out