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Old 02-17-2012, 12:33 AM   #1
UK-Wagon
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Member#: 232430
Join Date: Dec 2009
Chapter/Region: RMIC
Location: On the Left side
Vehicle:
555 XTi
1 AW & 1 CGM

Default 04/05 ECU & Harness Compatibility questions

I have an 06 2.5i that im looking to swap my complete EJ257 into.

My question is, since the 2.5i doesnt have the immobilizer do i HAVE to use a 04 harness and ECU?

Or can i use any year (04-07) STi harness and just use a 04 ECU??

Thanks
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Old 02-18-2012, 05:57 PM   #2
speedyHAM
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Member#: 48377
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: "They eat fish soaked in lye"
Vehicle:
1996 Gutted, built
XP class Impreza L

Default

If you are going to use an '04 ECU you need to use an '04 harness, or do some rewiring.

There is quite a bit of wiring you are going to have to do in any case, because the 2.5i does not have the fuel pump controller like the turbo models do, along with a bunch of other differences.

I recommend downloading the wiring diagrams and figuring out everything you need to get before buying anything. That way you know all the parts you get will work.
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Old 02-19-2012, 02:46 PM   #3
UK-Wagon
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Member#: 232430
Join Date: Dec 2009
Chapter/Region: RMIC
Location: On the Left side
Vehicle:
555 XTi
1 AW & 1 CGM

Default

Im buying a full headlight to tail light harness, not doing a merge or anything like that. So the FP controller will be there and the new FP sender will also be installed. That way i dont have to deal with any rewiring. I also happen to have a set of a/c air diverter motors for the new console swap.

Its just cheaper to buy a 05 harness than an 04, and 04 harness's are hard to come by these days.
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Old 02-22-2012, 08:50 PM   #4
speedyHAM
Scooby Specialist
 
Member#: 48377
Join Date: Nov 2003
Chapter/Region: MWSOC
Location: "They eat fish soaked in lye"
Vehicle:
1996 Gutted, built
XP class Impreza L

Default

When you get the '05 harness make sure you get the immobilizer and the matching key. If you don't want to swap out all your locks, just tape the new key next to the transponder.
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