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AMD, Toyota Certified
Category: Toyota
Satisfied Customers: 2728
Experience:  Master Automobile Technician L1 Advanced Level Specialist
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2002 toyota highlander: ac/heater..which fuse should i check

Resolved Question:

i have 2002 toyota highlander, clock and AC/heater not working, which fuse should i check?

Submitted: 5 years ago.
Category: Toyota
Expert:  AMD replied 5 years ago.

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.

Customer: replied 5 years ago.

automatic a/c control - control by adjust temp from 65 to 85 degree

Expert:  AMD replied 5 years ago.

OK check the following fuses:


15A heater

7.5A ECU-B



See if any of them is blown.

Customer: replied 5 years ago.
none of them are blown, all 3 are good
Expert:  AMD replied 5 years ago.

Does the panel come on at all? Or no response to anything?


Anything else not working other than the clock and heater controls?

Customer: replied 5 years ago.

panel not on at all, No clock, heater , ac , deforst rear window or deforst winshield

Expert:  AMD replied 5 years ago.
OK we're going to need to diagnose this conventionally. You will need basic mechanical skills and basic electrical skills and a volt meter, Do you want to perform the diagnosis yourself with my instructions? We will basically need to remove the heater panel and check for power and ground. If we have power and the ground then you need a new heater control panel. If we're missing one of them then we will follow through to find the missing link.
Customer: replied 5 years ago.

I don't have that skill - better bring to auto shop.

Expert:  AMD replied 5 years ago.

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.

Customer: replied 5 years ago.

OK thank you for the tip

Expert:  AMD replied 5 years ago.
No problem.
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