I have a 1999 toyota 4Runner and the heat ac control is not working properly. The control is digital with an lcd display. Most control buttons are not working. Others work occasionally. I know this part is a plug n play item, but I need to know how much disassembly is is required to get the part out of dash-front.

SOURCE: 1999 toyota 4runner problem

Same thing happened to me, I had it computer analyzed and it turned out to be bad injector # 3, cost about $300 replaced.

SOURCE: 2000 Toyota 4Runner Limited Heater

I have almost the same problem, in this case the power windows, power seats and loock those are not working
I was looking for the fuse but i didn't found it.

Could you helme 4runer 2k limited

IAD

SOURCE: No power to cigarette lighter/power outlet (front & rear)..

Replace the 15 amp ACC fuse that is in the fusebox under the dash. See if this eliminates your problem.

SOURCE: fuel filter replacement 1999 4runner

Under vehicle, passenger side, below seating area, front of fuel tank, mounted on chassis

SOURCE: Dash Control Unit Replacement

You can save a LOT of money by fixing it yourself.

All that is wrong with the knob are broken wires from the knob's PC board to the main PC board on the AC control.

All you have to do is remove the AC main control, take it apart, and resolder the broken wires from the PC board with the knob on it, to the main AC pc board. There are 3 wires, any number could be broken.

If you take it apart and solder the broken wires, this WILL fix your issue. Just make sure you put the wires back exactly where they go.

A FIXYA rating (4 blue diamonds) would be most appreciated for my assistance.