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Old 03-14-2004, 02:45 PM   #1
AndyM
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Default Can someone send me USDM WRX Wiring Diagrams? Wiring progress inside

If anyone can send me thanks in advance my email address is [email protected]


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Last edited by AndyM; 04-03-2004 at 11:58 AM.
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Old 03-14-2004, 04:52 PM   #2
imprezaclipse
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What year?
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Old 03-14-2004, 05:10 PM   #3
AndyM
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Lookin for 02 or 03. I finally got my harness and I completly unwrapped the front harness and the bulkhead harness. I took out one side of the SMJ the side where it connects to the actual engine harness. But now Im kinda stuck and dont know where to go from here.

I should look directly for engine wires correct?
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Old 03-14-2004, 05:11 PM   #4
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here is a pic of what I took out. This was pretty easy to take out actually none of the wires were tangled up it just came out like this.

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Old 03-14-2004, 05:22 PM   #5
imprezaclipse
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Quote:
Originally posted by AndyM
here is a pic of what I took out. This was pretty easy to take out actually none of the wires were tangled up it just came out like this.

Ya dont really need this part but having the connectors (black,brown) will be helpfull. I didn't have them and had to resort to molex connectors from radio shack and use a wiring diagram to match up wires correctly. Since you do have these connectors and I assume you have the conectors on the engine as well it will easier for you. Actually, I beleive you can get away with not having any diagrams at all. You will need however the ECU i/o list for your car and engine year. These can be found at raven blades site.
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Old 03-14-2004, 05:33 PM   #6
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Quote:
Originally posted by AndyM
Lookin for 02 or 03. I finally got my harness and I completly unwrapped the front harness and the bulkhead harness. I took out one side of the SMJ the side where it connects to the actual engine harness. But now Im kinda stuck and dont know where to go from here.

I should look directly for engine wires correct?
Sorry i've got an 04 diagram. Here is some help de-tangling the rest,1.Find your connectors that hook up to your ECU.2 Pull out your ECU i/o list for the engine year.3 begin labling EVERY wire that comes out of the ecu connectors.4. once labled follow that wire and see where it go's and cut it at it farthest length,be careful here however, some connectors you will want to keep intact, an obvious one is your MAF sensor connector. The connectors you want to keep should become real obvious to you when doing this. Also, some wires like the starter,speed signal and numerous grounds "branch out" into more wires, don't be afraid to cut these wires before they branch.Remember you will be splicing these wires into your cars harness right at the ecu so there is no need for that extra wiring that's already in your car,got it? Don't be afraid to ask if not sure.
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Old 03-14-2004, 07:12 PM   #7
AndyM
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Wow thanks for the motavation.

I have some more questions on wether or not I should keep these wires on the RS wiring harness or use the WRX wiring harness.

Should I keep the VSS wire from the RS harness or can I just cut it out use it on the WRX harness.
Ignition switch--I asume to keep the RS wire

Thanks

Andy
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Old 03-14-2004, 07:27 PM   #8
imprezaclipse
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Well the same goes for your RS harness. Get out your RS ecu i/o listing and lable every wire coming out of your RS ecu. Most of the wires that come out of your RS ECU will get spliced right there with that wrx harness your working on. EX.... fuel tank level sensor wire,your RS harness has one and your wrx harness has one also, cut and splice them together. I think this wire is even the same color/stripe in both harnesses! Alot of wires you will simply cut and through out of your RS harness they are the wires that go to your old RS engine ( the two big connectors one brown and one white on the right rear of your old RS engine) Be careful here though,there are two wires here that you want to keep and they don't go to your old RS ecu at all,they are your oil press and collant temp wires. If you don't splice these in you won't get any readings on your dash.
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Old 03-14-2004, 08:00 PM   #9
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i-speed has the 02 WRX wiring diagrams on there web site
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Old 03-14-2004, 10:18 PM   #10
AndyM
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Thanks a lot. Do you think it would be a good idea to label those wires on the RS harness the ones inside the engine bay? The 2 main connectors I mean. Are their any other wires by the main RS harness I should be aware off?

Also the coolant temp line I can tap at the WRX ECU side but the oil pressure I have to tap at the instrument cluster since their are no connections at the ecu correct?

Thanks

Last edited by AndyM; 03-14-2004 at 11:18 PM.
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Old 03-15-2004, 07:10 AM   #11
imprezaclipse
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Quote:
Originally posted by AndyM


Also the coolant temp line I can tap at the WRX ECU side but the oil pressure I have to tap at the instrument cluster since their are no connections at the ecu correct?
Wrong,kinda..... the coolant temp signal wire that goes to your wrx ECU comes directly from your new eingine, but there is another wire that goes directly from your engine to the dash. This wire is a white/green wire. Your oil press wire is green/white be sure not to get them confused!. I'am getting this info from a 2000rs diagram but your 2001 should be no different. Another thing is you don't have to splice these wires right at the instrument cluster, I don't know why people use that term,I spliced mine in the engine bay,it's a whole lot easier that way. I never once removed my gauge cluster or any of the driver side dash area for that matter.

Last edited by imprezaclipse; 03-15-2004 at 07:24 AM.
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Old 03-15-2004, 07:19 AM   #12
imprezaclipse
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Quote:
Originally posted by AndyM
Thanks a lot. Do you think it would be a good idea to label those wires on the RS harness the ones inside the engine bay? The 2 main connectors I mean. Are their any other wires by the main RS harness I should be aware off?
You can, I did, but when your done you will see what a waste of time that really is. All those wires except the coolant temp,oil press and a few grounds will get cut and tossed out anyways, I'am talking about things like crankshaft pos.,camshaft pos.,throttle pos....all the things your new engine and ecu have no use for. Once you are done you will relize alot of little ways you can speed up the process if you ever had to do a swap again. I bet I could knock off at least 5 hours worth of time if I had to do another one simply by taking some short cuts. Labeling each wire takes time but for a first timer it's really the only way to go.
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Old 03-15-2004, 08:42 AM   #13
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Try to minimize cutting off as many of the factory plugs as possible. Definately use the Brown and Black connectors that go to the left side of the engine. It will make it alot easier in the long run. If you need to shorten up the harness do it at the SMJ as that plug is not really needed. As far as the coolant and oil temp wires that come off of the SMJ they just need to be spliced into the appropriate wires on the RS harness. These are for the gauge and the idiot light on the dash.

Do youself a favor and get both of the diagrams before you go any further. It will help you a lot and you won't be shooting in the dark. You can download both of these from Subaru for a fee or just go to your local dealer and buy the book itself. I recommend the download so you can print it out oversized so you don't go blind as you are attempting to flip through the 11 pages of the WRX manual and the mouse print of the RS manual.

Z
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Old 03-15-2004, 09:40 AM   #14
anders8
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techinfo.subaru.com

Download all the wiring diagrams you want for $20

Anders
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Old 03-15-2004, 10:39 AM   #15
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yup as anders said .. and follows the polcies of the board ..
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Old 03-15-2004, 01:22 PM   #16
AndyM
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Thanks a lot guys seriously this is a huge help for me to advance my process in the swap. I want to get as much done to the WRX harness as I can before I actual start to tear down the RS related stuff. This is my only car and have to use my time wisely
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Old 03-15-2004, 01:42 PM   #17
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Quote:
Originally posted by AndyM
This is my only car and have to use my time wisely
You should plan on something going wrong and not being able to use your car for a while. Make arrangements with friends for alternate transportation.

Anders
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Old 03-15-2004, 03:33 PM   #18
Zephyr
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Make sure that your engine is complete beforehand then in addition to all the wiring. Make sure every little nut and bolt is there and that it's completely assembled. I was in the same situation and I my car was not running for a period of 25 hours. Figure out what wires you are going to need to splice what to on the two harnesses and make up a sheet on a note pad and check them off as you do them it goes alot faster that way and it's alot less confusing.

Z
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Old 03-15-2004, 07:08 PM   #19
AndyM
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Yes I hear you guys out. I do have a time schedule down. I wont actually start the swap process until the end of May (thats when school ends and I have 3 weeks to work with and my work is only 5 min. walking distance). My motor is near complete besides some sensors that I need which are MAF, Rear 02 sensor, and boost selenoid, thats about it. I have taken all of the advice and now Im in the process of tracing the wires that start at the ECU connectors and cutting them. Yes I do know that I may need to keep some connectors I double check with my wiring diagram before I make the cut. So far its working out pretty good, but man is it time consuming.
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Old 03-16-2004, 01:07 PM   #20
AndyM
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Hey guess made a lot of progress last night. Im almost finished tracing all the wires from the ECU connectors. Most of the wires left are going to the SMJ. Is it ok to cut these that are going to the SMJ? I dont think I have a choice because their all tangled up around other wires so I cant pull it out easy like the one I did with the other side of the SMJ.
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Old 03-16-2004, 04:50 PM   #21
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Quote:
Originally posted by AndyM
Hey guess made a lot of progress last night. Im almost finished tracing all the wires from the ECU connectors. Most of the wires left are going to the SMJ. Is it ok to cut these that are going to the SMJ? I dont think I have a choice because their all tangled up around other wires so I cant pull it out easy like the one I did with the other side of the SMJ.
I would, cut them and then solder them back together with the other part you already removed with the black and brown connectors,stager the splices so you don't have all the splices lined up at one place.
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Old 03-16-2004, 04:53 PM   #22
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You may want to wait on doing that until the car is up and running so you don't end up with an extra 3 feet of wire in the passenger compartment. I still have yet to remove my SMJ from my car. It's just neatly placed up along the firewall behind the strut tower.

Z
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Old 03-16-2004, 04:56 PM   #23
imprezaclipse
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Quote:
Originally posted by Zephyr250
You may want to wait on doing that until the car is up and running so you don't end up with an extra 3 feet of wire in the passenger compartment. I still have yet to remove my SMJ from my car. It's just neatly placed up along the firewall behind the strut tower.

Z
Good point Zeph, I did not have the luxuary of that SMJ harness section so I had to do things a little differently,Longer is always better,you can always shorten the wires later.
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Old 04-01-2004, 11:07 PM   #24
AndyM
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Hey Im still around, just got back from Spring break. Wiring is going smooth. I think I have all the necessary wires seperated from the rest of the harness. Im going to start this weekend to label all the wires in my RS.

here are some pics of my progress







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Old 06-21-2004, 10:02 PM   #25
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Hey guys. I am the guy that bought all of the above from Andy. I do have the engine installed completely. Now all I need is to splice ECU wires from the RS to the WRX eh?

~Anthony.
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