I had the same problem and just by guess, I found it was the control module. I found a new one at a dealer. COST$200.00.
Yes, the overhead heater controls do light up.
To get to the bulb for lighting the heater controls, the front panel will have to be removed. Depending on the type of vehicle, the knobs might have to be popped off first. It is also possible on some vehicles to get to the lighting for the heater controls from under the dash.
The fuse that is marked heater.
Heater blower resistor is what controls the low medium high speeds...
BIOSPHERE
On my '89 Tempo, heater controls are held into the dash kinda like how the radio is held in. Since I don't know of a tool to remove the heater controls like the one for the radio, I stuck something into each hole to hold back the clip. A bit of wiggling and I had it out.
got power to the controls but dos not trun on
dont
== == It is accomplished by adding an indirect fired water heater and controls.
how does the heater controls work on a 2004 chev trk my controler does not change from the floor to the front duck or to the def .and were is the broken unit place in the dash
To replace the heater controls in a 1988 Toyota 4Runner, start by disconnecting the negative battery terminal for safety. Remove the dashboard trim surrounding the controls, typically by unscrewing or prying it off gently. Next, unscrew the heater control unit from its mounting, disconnect the wiring harness, and pull out the old unit. Install the new heater controls by reversing the process, ensuring all connections are secure before reassembling the dashboard.
The resistance that controls a heater motor in the electric system .