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Old 10-20-2003, 12:31 PM   #1
kwycstix
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Location: Seattle area
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2003 WRX Wagon
WR Blue Pearl

Default Dash wiring and the defrost air conditioner

Are there any locations on the web that have the wiring diagram poasted for an 03 WRX Dash, or do I need to fork out the money to by the service manuals?

I am asking for a couple of reasons. I am interested in disconnecting the air conditioner when I turn on the defrost (I would rather have manual control of the air conditioner, and its a drag on the engine when I am a road rally and want to hold a constant speed). I am also interested in connecting into the Odo wiring for my rally computer.
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Old 10-20-2003, 12:42 PM   #2
Mulder
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A/C-defrost mod info in this thread-
http://forums.nasioc.com/forums/show...hreadid=148118

For the manual just go here and download it straight from Subaru-
http://techinfo.subaru.com/html/index.jsp

$20 gets you a 72-hour subscription to download as much stuff as you want, so as long as you have a fast connection and lots of time you can get the entire manual for practically nothing compared to what the printed version costs.
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Old 10-21-2003, 12:24 PM   #3
kwycstix
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Unhappy

Looks like Subaru changed their costing, they want a set price per item selected to download. $17.61 for the wiring system section isnt too bad, but to get the rest I might as well purchase it from subaruparts.com. Price will be about about $70 cheaper, unless there is a trick to it that isnt obvious.
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Old 10-22-2003, 04:49 PM   #4
DarkSong
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2004 WRX
Java Black Pearl

Question a/c clutch harness wiring on an '04 WRX?

I won't have the time to tear apart the dash until this weekend, but I'd like to disable the a/c by pulling the wiring connector for it, that someone else mentioned in that mod thread. Can someone verify for me that it IS the small 2-wire plug that sits on top of the a/c compressor unit that I would need to disconnect?

A pic would be greatly appreciated, too - I'm new to the Subaru thang, and still trying to learn what is where under the hood. Thanks!
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Old 10-22-2003, 05:01 PM   #5
Mulder
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Well, this one isn't under the hood.
I don't know for sure that the 04s are the same as the 02-03s, but assuming they are-
If you pull the HVAC unit out from the dash, there is a microswitch on the right side that is operated by the cam wheel that turns when you move the mode selector dial. You'll see that the switch is activated in the defrost mode. The switch can either be disconnected by cutting a wire, or disabled by loosening the screw that holds it in place, rotating the switch to where the cam can't reach it, and tightening it back in place.
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Old 10-22-2003, 06:07 PM   #6
interiot
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First, PDFs are still $20 for 3 days of access. The site is a little confusing and isn't clear which links go to PDF downloading and which links lead to shipping a paper manual to you. Hint: click on the links on the left side, and if you get to a screen that asks you for shipping information, that's not the PDF download section.

Second, it's entirely possible to download all the PDFs in one 72 hour period. In particular, this tool will download the manuals for a car over a cable modem in two or three hours.

Third, for disabling the A/C, there are a number of relays and fuses that would probably effectively disable it. (am I understanding right? Why not just not turn the A/C on?)

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Old 10-22-2003, 06:12 PM   #7
Mulder
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The point of the mod being discussed is not to disable the A/C, but to prevent it from coming on automatically when in defrost mode. The mod results in full manual control of the A/C compressor in all modes so you can choose whether to use it for defrosting or not.
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Old 10-23-2003, 11:52 AM   #8
kwycstix
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Default

Foudn the links for the 3 days of downloads. Bummer part is that it looks like the file names have all been changed and are numeric values instead of chapter and name. So the script is unable to find files to download. So doing it the manual way.

On the air conditioner switch I will try and get a picture of the micro switch tonight and post it.
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Old 10-23-2003, 11:29 PM   #9
kwycstix
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Here are the pictures, sorry for the low quality, bad light and only a camcoder to take them with.
Attached Images
File Type: jpg climate-screws.jpg (43.8 KB, 89 views)
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Old 10-23-2003, 11:39 PM   #10
kwycstix
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2003 WRX Wagon
WR Blue Pearl

Default

Ack
In the above picture remove the screws at the arrows.

You should see the top of the switch here:



Then working carefully, lift the unit up above the stereo mounting points. This give the best access to the microswitch.



Unscrew the single screw, flip the switch over (making sure to not have the switch stuck closed) and tighten the screw and put everything back.
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Old 12-16-2004, 10:43 AM   #11
CARB
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Great Post... I really appreciate it. The fuse removal will keep the compressor from coming on but the x-tra cooling fan on the radiator will still come on as will the idle of the engine be higher! It really makes me sick that subaru would design this system this way. It has always been an american car thing to do. My old 98 accord would go on automaticaly like ours but then the ac switch would be able to overide and turn it off.

Thanks for the time and effort you spent documenting this mod.

This takes care of the fog problem, And there is no need for ac when you are melting the Ice off your windshield.
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Old 12-16-2004, 03:06 PM   #12
OneOBS
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Sounds like a great mod, but I need a little clarification:

After the mod (with the control in the defrost position):
  • Hot air will come out of the defroster (just like the air coming from the other vents)
  • Cold air will come out if I manually turn on the air conditioning.

Thanks!
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Old 12-16-2004, 04:49 PM   #13
CARB
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Yes that is correct. You will need a really small philips head screw driver to remove the switch screw. Once removed just flip over and put screw back in. Move the dial and make sure the cam on the control does not contact the switch. Eazy only took me 20 min.
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Old 12-16-2004, 07:22 PM   #14
OneOBS
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Thanks! I smell a weekend project....
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