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AC Compressor and condenser fan ONLY come on when relays are jumped
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Double J
Veteran
/ Moderator
Jul 26, 2022, 2:34 PM
Post #26 of 35
(962 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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The high end Scan tool that HT mentions is obviously the way to go
Eliminate all the guess work
But since thats not an option, and i agree it's not , why not trace your steps.
You made this statement....
This is all starting to make sense, because I had pulled out my entire dash to replace a leaky heater core about 3 years ago, and since then the AC had never worked, though it worked flawlessly before that. I'm suspecting that I forgot to re-plugin some small items when putting everything back together. i know it's a PITA to remove a dash once, let alone go back again, but you may have to.
Or bite the bullet, and at least pay a qualified Shop/Tech to at least diagnose it for you.
Then you can decide if you have the chops to repair it or not.
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flipstyle
User
Jul 26, 2022, 5:12 PM
Post #28 of 35
(943 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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The high end Scan tool that HT mentions is obviously the way to go Eliminate all the guess work But since thats not an option, and i agree it's not , why not trace your steps. You made this statement.... This is all starting to make sense, because I had pulled out my entire dash to replace a leaky heater core about 3 years ago, and since then the AC had never worked, though it worked flawlessly before that. I'm suspecting that I forgot to re-plugin some small items when putting everything back together. i know it's a PITA to remove a dash once, let alone go back again, but you may have to. Or bite the bullet, and at least pay a qualified Shop/Tech to at least diagnose it for you. Then you can decide if you have the chops to repair it or not.
Very true, and thanks for the reply. That's what I'm trying to do right now is trace the work and see exactly where the AC signal terminates. Because it wouldn't make sense to keep diagnosing components AFTER a certain point if the signal isn't even reaching the engine bay.
Re: taking apart the dash. We're on the same wavelength. And this is why my main concern right now is determining whether or not the AC signal is reaching the relay sockets for the compressor and condenser fans.
If it is, then I know I no longer need to fiddle with anything else in the cabin. If it isn't, then removing the dash is probably the way to go.
Is there any easy method to test for the AC triggering signal on the relays?
I saw a similar video for a Ford vehicle where they basically had the positive lead of the multimeter connected to a separate 12v source, then probed one of the 4 wires of the socket for ground (with AC activated) which gave the 12v readout. Essentially it appears as though one of the wires on the socket gets grounded when the ac is activated. I'm just not sure which one that would be on my particular relay, since I don't know how to read the diagram on it.
https://i.imgur.com/FZxmMi6.jpg
Any ideas? As stated before, the 3 and 5 pins are copper and 1 and 2 pins are silver. The corresponding 3 and 5 pins (copper) on the socket read HOT 12v 24/7 whether or not the car is on or off or ac activated or deactivated.
I think this will be the most vital part in my investigative process, and at least let me focus on efforts either in the interior or engine bay.
Any help would be greatly appreciated!
(This post was edited by flipstyle on Jul 26, 2022, 5:16 PM)
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flipstyle
User
Jul 26, 2022, 6:54 PM
Post #30 of 35
(915 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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Thanks so much Hammer for the clarification...as always greatly appreciated!
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flipstyle
User
Jul 26, 2022, 7:21 PM
Post #31 of 35
(907 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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By the way, you wouldn't happen to have a diagram of the pinouts for the pcm module itself, sir? I know the numbers and colors of the wiring to target. But just want to ensure I'm targeting the right ones because there are 3 separate plugs that feed into the pcm and multiple wires that have the same color scheme.
Thanks!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 27, 2022, 4:17 AM
Post #32 of 35
(897 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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This is it. If you need any more you need to buy Alldata.
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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.
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flipstyle
User
Jul 27, 2022, 4:22 PM
Post #33 of 35
(886 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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Thank you!!!
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flipstyle
User
Aug 15, 2022, 9:58 PM
Post #34 of 35
(827 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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Just wanted to update this thread with a conclusion.
Thank you all for your help along the way, especially hammer for his gracious scanning of diagrams.
However, after all those days and hours of ripping apart/testing components, and testing for proper ground and 12v signals on the relays, the solution ended up being extremely simple.
A 5th gen accord owner suggested that I look at the HVAC/climate control module in the console, which would explain the possible short in the evap temp sensor circuit.
So I removed the stereo cluster prepping to remove the hvac module and surrounding wood trim. Turns out, one of the 2 plugs going into the unit was halfway plugged in (again, this is going back to my removal of the dash several years ago). Pushed the plug firmly back in...and wallah....AC and all associated functions work perfectly.
Just a headsup to anyone who may have AC issues and is pulling their hair out. Don't forget to check out the actual climate control cluster itself. And ensure the simplest things like plugs are all seated firmly.
Finally able to drive my car in this ridiculous weather.
Thanks again!
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 16, 2022, 4:15 AM
Post #35 of 35
(822 views)
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Re: AC Compressor and condenser fan ONLY come on when relays are jumped
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Man made problems are always the hardest to find.
Closing this now as solved.
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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.
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