I am having a problem with the Temperature knob on my 2006 Highlander. It will occasionally turn the temp up and down, but not all the time and has gotten worse. The heat and air still work but only at the temp it is set to. I did take it to a Toyota dealer and they too told me I had to replace the whole unit because a wire was broken. It was going to cost 1200.00. Do you know if the 2006's are made the same as the 2004's that you have listed on your blog so we can follow those instructions for fixing it. Thanks so much.

SOURCE: My 2005 highlander has the knobs that control the

Hello, and welcome to FixYa, Please allow me to assit you.

The issue that you are having is indeed in the control assembly. Yes, it does cost over 600 dollars to replace it.

However...if you have any soldering skills, or know someone that does have soldering skills, you can fix this problem yourself.

All that is wrong with the controller is a broken wire going from the small printed ciorcuit board that the knob is located on, to the controller's main PC board. Removal of the controller, and a disassembly will show you the broken wire. Just solder the wire back to the terminal that does not have a wire on it will fix you right up, AND save you 600 dollars!!!

Thanks for choosing FixYa for advice today.

Testimonial: "Thanks I will let you know if it works"

SOURCE: Toyota 04 Highlander Temp Control Problem

Hello. Thank you for requesting me. We have been seeing a large amount of Highlanders with temperature control issues. A replacement control is in the proximity of 900 dollars. After the fifth one sold, and some really unhappy customers, I decided to see what the issue was that was causing the failures. It turns out that the problem is nothing more than a broken wire of two. If you are handy with tools, and can use a soldering gun, you can fix it yourself. The problem with the controls needing replacement is a broken wire or two at the circuit board that controls the temperature (the center knob). This is unfortunately common, albeit an expensive repair. Here is how you can fix it yourself: What you will need: Pencil-type soldering iron, rosin core solder, a Phillips screwdriver, a 10 millimeter socket, extension and ratchet. First, remove the plastic fascia that surrounds the radio/heater-AC control. (Be careful to not crack it when removing it.) Next, remove all of the 10 millimeter bolts that holds the Radio/AC-heater control assembly to the dash panel, and unplug all of the wiring connectors. Next, remove the three control knobs on the Heater/AC control panel, and the silver nuts that holds the controls to the panel. They pull straight off. (Under the center knob, you will probably find a loose nut, this is what caused the wires to break, the control is loose in its holder.). Next, turn the assembly over, with the back facing upwards. You will see a rectangular black box. Remove the screws that hold the black box onto the back side of the front of the control panel. There will be a ribbon-wire connector that will need to be removed from the front panel; be careful when removing the black box?s connection, and take care to not damage the connection ribbon wires. Next, remove the entire circuit board from the panel cover, by removing several Phillips screws, this will allow easier access to the control board that needs the wire(s) soldered. At this point, you have two choices: You can solder the broken wire back onto the control?s board, or, if you desire, you can remove the ribbon wire, and replace it with different wires; personally, I choose this path, and I use telephone wire, three lengths, that I strip and solder to both locations, each of the three on the main board and the other end on the control board. Either way will work, as long as you solder the wires back properly, and avoid any possible shorts by allowing the solder to touch an adjacent lead. Once you have soldered the broken wires from the temperature control board back on to the main circuit board; reassemble the parts and refit it assembly to the dash. Thanks for choosing FixYa for assistance today; I hope that this helps you out, and saves you a bunch of money.

Testimonial: "Thanks so much for the detailed instructions! Sure enough, 2 wires were broken. My husband was able to make the repairs, and the control gauge is now working perfectly. Thanks so much!"