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  #1  
Old 12-15-2015, 03:05 PM
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Exclamation 04 wj ac clutch wrx by jump only

Hello folks..ac light goes on and tried diff modualtor thinking may b the switch.
.if I jump relay then clutch goes on. I think the low press switch is near radiator..3 wires..
But which.wires would I jump to test low p switch?.
Beyond that..what to check..
I don't have a wire diagrame.
What do u think..
I got purp/blk stripe
blue/blk stripe
And all blue wire
I got 5 volts at soild blue wire....
Which should I jump It to to test.
Update!==I just jumped 30 and 87 female where the relay would go...my clutch runs .then I removed the h press switch....she runs either way

So now what do I do? How do I trace from relay to inside on off switch?

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Old 12-15-2015, 04:11 PM
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Re: 04 wj ac clutch wrx by jump only

The 04 WJ doesnīt use a pressure switch, but a pressure transducer. It can be that the transducer is bad, but many times just the pre-charge is too low and the PCM will simply not activate the clutch relay. Also be sure that fuse 21 on the junction block is ok, otherwise the relay will never be activated.
Attached two pages from the service manual.
Attached Files
File Type: pdf AC compressor clutch.pdf (123.8 KB, 4 views)
File Type: pdf AC pressure transducer.pdf (176.4 KB, 3 views)
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Old 12-15-2015, 07:41 PM
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Re: 04 wj ac clutch wrx by jump only

Wow great ! Thx now I can trace from pcm out...
Would u have the wire colors from ac modulator in dash (on off switch) to pcm?..the ac light goes on..thx!!!!!
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Old 12-15-2015, 10:30 PM
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Re: 04 wj ac clutch wrx by jump only

ImageShack - 2015-12-15-17-08-09.png
X is the tranducer? Same line as arrow
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Old 12-16-2015, 12:44 PM
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Re: 04 wj ac clutch wrx by jump only

I got power on one side of relay but the ground side doesn't ground!..85 and 86
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Old 12-16-2015, 01:29 PM
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Re: 04 wj ac clutch wrx by jump only

I donīt have values for the pressure transducer output voltage at different pressures. But i donīt think that you can just jumper the pressure transducer connector. It would give a very low pressure signal, or a very high pressure signal, which in both cases the PCM will not activate the compressor clutch.
Are you sure the refridgerant pre-charge pressure is ok to start with?
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Old 12-16-2015, 01:38 PM
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Re: 04 wj ac clutch wrx by jump only

The AC switch signal goes from the AC control module to the BCM. Then the signal goes via the PCI data bus to the PCM.
See attached schematic.
But before measuring, i would confirm that the AC refridgerant pre-charge pressure is ok.
Attached Files
File Type: pdf AC switch signal.pdf (138.9 KB, 5 views)
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Old 12-16-2015, 04:25 PM
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Re: 04 wj ac clutch wrx by jump only

I got it!!!!!! U were right on post 6.. I found the values from another thread.hooked a AA battery to the signal wire and my clutch powered up!!!!! Thx for the schematics!! Was checking every where!
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Old 12-16-2015, 07:49 PM
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Re: 04 wj ac clutch wrx by jump only

So i see in an other thread that you have PCM problems as well? Its the PCM which makes the ground for the compressor clutch relay, so the problem can be there.
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Old 12-16-2015, 08:32 PM
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Re: 04 wj ac clutch wrx by jump only

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Old 12-16-2015, 10:03 PM
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Re: 04 wj ac clutch wrx by jump only

PCM which makes the ground for the compressor clutch relay, so the problem can be there.[/FONT][/QUOTE]
10-4...ill xplore more and I'm getting a transducer from a junk yard 2 c
.what do u think about resoldering pcms?.ill start a new thread
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