Hello and thank you for choosing just answer.
In order to better assist you I need to know if you have automatic or manual A\C heater controls.
automatic a/c control - control by adjust temp from 65 to 85 degree
OK check the following fuses:
7.5A RADIO NO.2
See if any of them is blown.
Does the panel come on at all? Or no response to anything?
Anything else not working other than the clock and heater controls?
panel not on at all, No clock, heater , ac , deforst rear window or deforst winshield
I don't have that skill - better bring to auto shop.
OK, I will explain what will happen and what to expect.
The person who's going to work on the vehicle will take out the panel and will check for power and ground to the unit, if you have both then the problem is with the unit itself and it will need to be replaced. If either power or ground is missing then they will follow the wiring to determine where is the broken wire and fix it and recheck.
Knowing toyota and having experience with them I have seen more heater control panels go out than wires get broken. Unless there's a problem with the fuses or the junction block then the panel would be the next suspect. But you can't just assume this and replace that expensive panel to find out it's a broken wire that's why there has to be a check before determining it's the panel itself.
Let me know if you have any other questions.
OK thank you for the tip