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a/c power flow

 
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Old 08-25-2013, 10:36 PM
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a/c power flow

Hey guys I have been trying to get my a/c to work. I have read the threads and have tested the switches to the best of my knowledge, but I am not able to get the clutch to engage. pressures are correct. Power does not go to the clutch. gets to the relay but does not go through the relay. I have been looking at the wire diagrams off of alldatapro.com but have not been able to figure this one out. I have powered the clutch myself and it worked. Not sure if I am lacking ground for the power to shoot through the relay or not. Also have traced the wires back to the ecu. they seem to pin up correctly with the obd1 ecu. have not check for power out of it, but figured it would be good if I got power at relay and a/c button. The switch that I am mostly worried about is the one under the glove box. I made sure the wires were connected throughout system, but when checking wire from a/c button had no power so not sure if that is my problem for it not working.
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Old 08-25-2013, 11:10 PM
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Re: a/c power flow

check a fuse. I had this issue too but an electrician found the issue. i think it's the fuse under the wheel.
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Old 08-25-2013, 11:32 PM
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Re: a/c power flow

Well was outside checking more wires and the pink/blue wire that goes from the ecu to the relay is not getting continuty. I assume it should since it is just a direct wire from the ecu to the relay just goes through some connector. I believe your talking about a fuse that is on the driver side floor board?
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Old 08-26-2013, 12:00 AM
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Re: a/c power flow

yes. also, make sure the a/c buttons are working right. I know that on 4gens the circuit boards get broken solder contacts.
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Old 08-26-2013, 01:34 PM
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Re: a/c power flow

If it goes to the relay, but then stops.... Relay is bad.......

Because of a broken connection in the relay. Replace that and that should do the trick
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Old 08-26-2013, 02:52 PM
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Re: a/c power flow

Well the wire that I am thinking about goes from the ecu to the relay for the ground side of the relay i believe. I have swapped relays and nothing changed and I have tested the relays and they both clicked strongly. So I doubt it is the relay.
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Old 08-26-2013, 04:43 PM
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Re: a/c power flow

I have been working on the same issues all summer. I took it to a shop that specializes in A/C. The guy had it for 2 days and still couldn't figure it out. He said I had some wires cut and he spliced them together. Then he changed out the fan switch relay and jumped the clutch and compressor. He said everything turned on and worked but I had a bad ground connection somewhere. Then he said the bad ground was in the head unit itself and would be expensive to find on that is the same part number and put it on. I told him to just give me the bill and I'll take care of it. So $220 later all that was done is a few wires spliced and jumping the clutch. I ordered a head unit for $60 and put it on once it came in. Still nothing. So either I bought a bad unit, or the guy was wrong about his diagnosis. Either way I'm still interested in fixing the A/C.

What is the actual location on the pink and blue wires your talking about so I can check on my and test continuity. Appreciate it and I'll let you know if I have anything happen as well.
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Old 08-26-2013, 05:57 PM
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Re: a/c power flow

the pink and blue wire goes from the relay to the ecu. then from the ecu blue/orange to the ac pressure switch then Yellow/Blue to the thermostat under the glove box. here is 2 pictures of the wiring diagram from alldata. I am not sure if I have an ecu problem since mine is a p06 ecu even though it has been reprogrammed.

Not the images I tried to put on. Wont let me save images from it and repost it.

Also the wiring that goes from the ecu to the switchings come out of C5 and the pink/blue wire going into the ecu goes into A17
Attached Images
File Type: jpg 78726094.jpg (18.6 KB, 2 views)
File Type: jpg 78726095.jpg (18.6 KB, 1 views)
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Last edited by NightRacer; 08-26-2013 at 06:02 PM.
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Old 08-26-2013, 08:04 PM
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Re: a/c power flow

Hey i found the problem finally. you should check the wire loom underneath your passenger fender if you can feel the wires check to see if the blue/orange wire is shredded or stretched. That turned out to be my problem. A/C is blowing Ice Cold now.
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