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Ac doesnt work. fans dont work. Ive already verified the…

Customer Question
Ac doesnt work. fans...

Ac doesnt work. fans dont work. Ive already verified the basics. have lots of Volt#s and signal reference numbers

Mechanic's Assistant: Have you checked the Freon level?

Its 65-75psi static yes

Mechanic's Assistant: What is the model of your '65 Toyota?

2011 sienna

Mechanic's Assistant: Are you fixing your Sienna yourself? What have you tried so far?

Yes. Ive tested fans posit and ground at controller, unplugged temp switch (fan switch) and they come on 100%, changed fan switch. I checked AC press switch pos and ground, its outputting 1.42v and has 5v input from harness, as does ffan switch

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The controller signal wire (very small one) is also grounded I didnt actually check Voltage there but it lights up my test light 100%,

Submitted: 3 months ago.Category: Toyota
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Answered in 26 minutes by:
3/30/2018
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago
david craig
david craig, Auto Mechanic
Category: Toyota
Satisfied Customers: 5,797
Experience: owner/mechanic at 3D Automotive
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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

you static pressure should be the same and both should match the outside air temp

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Customer reply replied 3 months ago
they do, just bought a brand new manifold guage set
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

have you jumpered the clutch relay to see if the compressor clutch engages

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Customer reply replied 3 months ago
If the AC/compressor/relays etc are dependent on the fans working I'd like to deal with those first. Engine temp more important than cabin temp..
Customer reply replied 3 months ago
I cant tell which is the compressor relay, its not labeled obviously. Which one is it?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

standby

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Customer reply replied 3 months ago
There is one in the underhood panel that O/pgd or something. Not standing there but thats the only one that looked like a maybe?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

4 or 6 cylinder engine?

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Customer reply replied 3 months ago
6
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

ok

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

auto or manual climate control?

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Customer reply replied 3 months ago
manual, no #temp setting
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

ok

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Customer reply replied 3 months ago
i need to put pos 12v to that pin?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

no. just check to make sure it reading a good ground

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

forget about that statement.

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Customer reply replied 3 months ago
make sure the relay is grounded? at white/blk wire?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

yes put 12vdc to it

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Customer reply replied 3 months ago
Ok so if I put volt to it and it works, replace integration relay, if it does NOT work... next step?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

that relay is not removable unless the changed the design in 2011

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Customer reply replied 3 months ago
well crap how would you fix that then... well lets assume the relay isnt the problem and it still doesnt go when I put 12v.. although I would think it "has" to applying current directly wouldnt it...?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

I do not assume anything. you need to apply 12 volts directly to the compressors clutch connector then

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Customer reply replied 3 months ago
true
Customer reply replied 3 months ago
Ok so say it does work when applying 12v to relay pin.. how would/could I replace and unremovable relay? We can skip to the cooling fans issue if youd like
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

you would need to replace the entire box

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Customer reply replied 3 months ago
That integrated relay isnt dependant on some signal from the ECM/fan switch is it?
Customer reply replied 3 months ago
btw you can say idk.. I dont expect you to have this complicated elec schematic at hand or committed to memory!
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

no, it controls more than just the clutch.

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

I have all the schematics at hand my friend

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Customer reply replied 3 months ago
good. I was just giving you some breathing room :)
Customer reply replied 3 months ago
I checked all the blade fuses with test light, if thats one of those open clear-top ones they all look ok but Ill check that again. And if its good?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

then you need to directly apply 12 volts to the compressors clutch connector

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Customer reply replied 3 months ago
That sucker is hard to get to.. esp when engine is hot.. OK so I have that diag tree. Can we talk about fans
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

not worried about the fans until this is figured out. they are controlled by that relay also

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Customer reply replied 3 months ago
Well I hope were wrong about it not being removable! Ok so which pin on that relay is for fans so I can check that while im there
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

standby

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Customer reply replied 3 months ago
sure
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

thanks for your patience

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Customer reply replied 3 months ago
np
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

my bad, the fans arent controlled by the integration relay.

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Customer reply replied 3 months ago
ok lets tackle that then. I check for pos/neg at controller, both good and fan switch/sender has 5v input
Customer reply replied 3 months ago
when I unplug sender, fans come on 100% high speed
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

jumper 5 to 3 in the relay plug and see if the fan comes on

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Customer reply replied 3 months ago
Got an image for that?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

pull the fan relay out , the prongs should be numbered 1,2,3,5 i sent you a schematic

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Customer reply replied 3 months ago
The same schematic with integrated relay?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

no

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

this one

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Customer reply replied 3 months ago
Ok so I jump those terminals fans come on, what does that tell me? And if they dont, what then? Were still on testing relays? The fan relay schem didnt come through then, got a couple blank pages
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

just jump the relay please

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Customer reply replied 3 months ago
That .pdf isnt working
Customer reply replied 3 months ago
ok got it. Btw Im not able to stand at the van, its 5 miles away, Im printing these out with your instructions written on
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

understood, but i need to know if certain things work before going further

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Customer reply replied 3 months ago
fans do not come on when jumping 3 to 5
Customer reply replied 3 months ago
doesnt it matter than unplugging the fan switch/sender turns on the fans, doesnt that mean the fan relay works, as they cant get power at all if it doesnt?
Customer reply replied 3 months ago
cooling fan ecu? You mean the fan controller mounted just above the fans on the radiator?
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

yes

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

and unplugging the sensor does not have anything to do with the relay. when the sensor is open the ecm automatically turns on the fans

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Customer reply replied 3 months ago
ok. Back at the a/c pressure switch, what range output should the pressure switch have volt wise? I want to confirm that pressure switch isnt bad.. I have a new one with me
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

standard voltage is 4.75-5.25

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Customer reply replied 3 months ago
it gets 5v from the harness, I mean the center wire, white/blk was grounded, green was 5v. The output wire reads 1.43v
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

here

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Customer reply replied 3 months ago
yeah pdfs arent working bro, idk why.
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

thats the only way I can send this.

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Customer reply replied 3 months ago
Ok, well Ill go iron out all what youve already told me and get back with you then. Itll be tomorrow most likely. Thanks for your help
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

ill be on tomorrow

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Customer reply replied 3 months ago
Thanks hope fully I just need relays.
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

not usually the case, but we may get lucky

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Customer reply replied 3 months ago
usually the controller? expensive part...
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

yep

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Customer reply replied 3 months ago
still there?
Customer reply replied 3 months ago
jumping the fan relay did not turn on the fans and jumping the intgrated (AC) circuit did turn on the compressor, although it did nothing at all to the A/C refrig pressures, high or low side, zero movement. That integrated relay does come out btw, although its a fight, youd have to get it out to test those circuits/pigtails underneath it anyway.
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

if jumping the relay between 3 and 5 did not turn the fan on there are only a couple possibilities. 1.the 60 amp fuse id bad. 2. the cooling fan ECU is bad. 3. the ECM is bad. that's it. period

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

hows it going?

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Customer reply replied 3 months ago
I told my buddy Id pay for him to take it to the dealer and have it diagnosed. Im 99% the fan controller is bad and about 32.6% his compressor is bad, even when it runs theres no change in pressure.
Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

ok

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Toyota Mechanic: david craig, Auto Mechanic replied 3 months ago

hows it going?

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