This place is a life saver. I was quoted $950.00 to replace the environmental control unit at Toyota. I was told that the computer had lost its logic. When I asked about this being a known problem with the Highlander, the service guys told me that they had never heard of any problems at all. After that I did some searching online and so did one of my wife's friends. He put me onto this site and I put all of this information to use today. When I got the panel apart and got to the controls, low and behold, not one, but two of the wires were broken. The nut on the heat control was loose so it fit right in with what had been described here. $7.00 for some 22 gauge wire and some careful soldering later it works like a charm.
