Hey there.

I was curious if anyone made additional headway on this thread for I am ready to purchase the materials, but wanted to leverage guidance from fellow members before cutting wires.

Here is what I have figured out to date for my 2012 4Runner SR5:
84140-35171 (2012-2013 version) - Turn signal/light stalk with the auto function (found on the Limited edition)
89121-50020 - SENSOR, AUTOMATIC LIGHT CONTROL. AUTOMATIC LIGHT CONTROL SYSTEM (CONLIGHT) for TOYOTA 4Runner (2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011)
??? - Sensor Harness for standard HVAC controls (still fumbling through a few websites to determine the product code for this one)

Any suggestions?

Thanks.