Ok, after spending 2 hours reading these 2 threads, I have a question. What exactly is the difference between A-TRAC and the standard traction control that is already built in? Then there is the auto LSD. I have 2WD with (here's what is listed on the sticker) VSC, traction control, ABS with EBD and brake assist, A-LSD, and rear diff lock. Without pushing any buttons, I spun the tires in sand the the brake pedal started pulsating; it was braking the spinning wheel to give traction to the non-spinning wheel. So the traction control is already limiting the slip, which makes me wonder what good the LSD button would do for me, and (if I had a 4WD) what more does the A-TRAC do?
Side note: Mine also has the plug for the A-TRAC switch in the dash, even though it's a 2WD. So that may help to confirm to some people that they do wire them up for all the options even if they're not installed, or have no possibility of being installed.