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2010 Toyota Corolla - AC won't turn on


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karrak
Novice

Jun 3, 2018, 10:30 AM

Post #1 of 16 (485 views)
  post locked   2010 Toyota Corolla - AC won't turn on  

I have a 2010 Toyota Corolla, not sure of engine size, 101K miles, and my entire ac system decided to stop working on my way home from work (fan and compressor). I checked all the fuses in the car and under the hood. There is a 50a fuse labled "air conditioning system" in the book, but under the hood, I can't seem to find it. Where that fuse should be, a plastic cover is over it so I'm guessing there isn't one or it's a different type of fuse. I pulled the center console out and saw several relays. I'm not sure if any of those are AC related and was hoping one of you might know as the book does not label them. I was also wondering if the speed selector could have anything to do with it. All the lights light up except for the "A/C", so I'm guessing that's related. See pics below. I'd like to try and go through this myself but, it sounds like I might have to take it in to get it checked out.


http://i65.tinypic.com/2e0o5eh.jpg
http://i66.tinypic.com/jfahs6.jpg
http://i68.tinypic.com/5ckth1.jpg


(This post was edited by karrak on Jun 3, 2018, 10:31 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 3, 2018, 11:52 AM

Post #2 of 16 (473 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

There are any number of things that can prevent the system from engaging. It is controlled by computer.
Unless you have extensive electrical experience and it appears you don't, you are going to need a professional to diagnose this for you.

Here is the wiring diagram.









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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



karrak
Novice

Jun 3, 2018, 1:17 PM

Post #3 of 16 (456 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Thanks for the diagrams. Is that the original size? I can just make out some of the wording. I'm not sure what the sequence of operation is, but it looks like the ac amplifier assembly controls everything and either it's not working or something (a sensor?) is preventing the ac system to turn on. The blower circuit looks separate from the compressor circuit and both are controlled by the ac amplifier. I'm also not sure what "E4" is or where it leads to though (ground?). I should be able to jump the 3 and 5 terminal where the HTR Relay sits and the fan should come on, right?


Ironically, I'm an HVACR tech by trade, but without diagrams, there isn't much for me to go off of except for the basics of checking fuses.


(This post was edited by karrak on Jun 3, 2018, 1:45 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 3, 2018, 1:44 PM

Post #4 of 16 (446 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

I enlarged them a little but that's about all I can do.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
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Tom Greenleaf profile image

Jun 3, 2018, 1:54 PM

Post #5 of 16 (440 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Idea? Try sending to yourself on another device or to a printer and print it then it should show clearly the details. Hard for me to directly read those too, T


Hammer Time
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Hammer Time profile image

Jun 3, 2018, 1:59 PM

Post #6 of 16 (437 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Send it to yourself?

If you want to save it to the computer, just right click on it and save it. You don't have to send it anywhere. You can then do whatever you want with it, including enlarge it further.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



karrak
Novice

Jun 3, 2018, 4:17 PM

Post #7 of 16 (427 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Thanks again for the diagram. I didn't get a lot of time to play around with this as its getting dark. I'll have to look into it more tomorrow.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 3, 2018, 4:32 PM

Post #8 of 16 (425 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

So, you have no compressor or blower, nothing?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



karrak
Novice

Jun 3, 2018, 4:39 PM

Post #9 of 16 (423 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

That's correct


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 3, 2018, 4:58 PM

Post #10 of 16 (419 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Check the HTR-ign fuse 10A in the dash fuse box and then check power out on the yellow wire from the AC switch.

From there it goes to the amplifier (module).



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



karrak
Novice

Jun 4, 2018, 4:40 PM

Post #11 of 16 (385 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Unfortunately, I don't get much time after work to play around with this but, I did get a chance to check the above.
The fuse is good. I pulled it out and checked to make sure I had 12v there. I pulled the connector off the "heater control sub assembly" and, I was either checking the wrong thing or was not making good contact to ground but, I was not getting any voltage there. I didn't have much time today but I'll give it another try tomorrow.
Also, where is the ac amplifier located? It states center of dash, but I don't recall seeing anything there with that wire setup.


(This post was edited by karrak on Jun 4, 2018, 4:46 PM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 4, 2018, 8:19 PM

Post #12 of 16 (361 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

It looks like it's on the lower part in front of the console.





~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



karrak
Novice

Jun 9, 2018, 12:09 PM

Post #13 of 16 (294 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Thanks for the help. I ended up just taking it in to the dealer to troubleshoot it for me due to the lack of time I have. They ended up saying it was the blower control switch, the one in the middle. Of course, the charge was pretty high so I'm just getting one from the scrap yard. Hopefully that's all it is!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 9, 2018, 12:22 PM

Post #14 of 16 (292 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Let us know how you make out.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



karrak
Novice

Jun 14, 2018, 3:23 PM

Post #15 of 16 (250 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

It ended up being that blower control switch :)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 14, 2018, 3:30 PM

Post #16 of 16 (248 views)
  post locked   Re: 2010 Toyota Corolla - AC won't turn on  

Thanks for following up

Closing this now as solved.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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