2002 WRX wiring = 2003 WRX wiring? - Subaru Enthusiasts Car Club of the Sierras

Kevin M · 2009-03-28, 11:45 PM

So not only do I not have a MY2003 specific FSM in my cache of that sort of stuff, all the places I look online can't seem to come up with one other. Some have 2002, and some have 2004, and a few have both, but there seems to be a gap. Did FHI just skip a year of electrical engineering for the US 2003 model year? Or is the internet just letting me down?

Dean · 2009-03-29, 06:53 AM

FSM?

There were very few changes of any form 2002-2003. The only thing I can actually recall that changed was front brake calipers and that was a mid-year 2002 change.

A dealership should be able to look up the part number for each. 2004 is probably a bit different.

100_Percent_Juice · 2009-03-29, 08:29 AM

Factory Service Manual?

khail19 · 2009-03-29, 08:38 AM

Quote:

Originally Posted by 100_Percent_Juice

Factory Service Manual?

Yes.

cody · 2009-03-29, 09:15 AM

I've never seen 2003 specific manuals.

Here's a nice little compilation though. http://ken-gilbert.com/impreza-manuals

Kevin M · 2009-03-29, 09:53 AM

Yeah, the funny thing is, I KNOW there's an extra pin on the '03 ECUs compared to '02, so at least one wire difference in the bulkhead harness. Otherwise, should be the same. What I really need to know though is if there are changes in the front and engine harnesses.

rubberbiscuitt · 2009-04-04, 05:08 PM

wasnt there an abs change in 7/02?

Kevin M · 2009-04-04, 07:26 PM

I thought that was just a programming thing.

Dean · 2009-04-04, 07:56 PM

ABS software change for '02-'03 cars and I think was made in '04. Front caliper changed late '02 model year, no brake related wiring change as far as I know.

cody · 2009-04-06, 10:35 AM

There was a CSP that allowed you to upgrade to the newer ABS ECU. I was able to get it done before installing my SS lines.

Kevin M · 2009-04-06, 10:40 AM

There is no ABS ECU. Just the ECU, which got reflashed, not replaced AFAIK.

cody · 2009-04-06, 10:43 AM

No, there is one and they replaced it. ECU, in this case, stands for electronic control unit. Read the letter here:

http://www.seccs.org/forums/showthre...hlight=abs+ecu

Kevin M · 2009-04-06, 10:48 AM

I think that refers to the pump unit itself. Now that I think about it, I guess it has to have some serious onboard electronics, given all the wiring going into it.

cody · 2009-04-06, 10:50 AM

Control Unit would not be a pump.

Kevin M · 2009-04-06, 10:51 AM

Or maybe not... down in that thread you refer to it costing $280, and the pumps are like $900. Now I'm confused. So where the hell is this thing? I've never seen anything I would think was an ECU in one. I haven't wrenched on many WRXs though.

cody · 2009-04-06, 10:54 AM

That I don't know.

sperry · 2009-04-06, 11:02 AM

The ABS pump under the hood has the "ECU" built into it IIRC. I thought the firmware upgrade was swapping an EPROM out for one w/ the new program.

MPREZIV · 2009-04-06, 11:05 AM

Scott's right. ABS Control Unit and pump are one unit.

2009-03-28, 11:45 PM	#1
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	2002 WRX wiring = 2003 WRX wiring? So not only do I not have a MY2003 specific FSM in my cache of that sort of stuff, all the places I look online can't seem to come up with one other. Some have 2002, and some have 2004, and a few have both, but there seems to be a gap. Did FHI just skip a year of electrical engineering for the US 2003 model year? Or is the internet just letting me down? __________________ FWD is the new AWD

2009-03-29, 06:53 AM	#2
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	FSM? There were very few changes of any form 2002-2003. The only thing I can actually recall that changed was front brake calipers and that was a mid-year 2002 change. A dealership should be able to look up the part number for each. 2004 is probably a bit different. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2009-03-29, 08:29 AM	#3
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	Factory Service Manual? __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2009-03-29, 09:15 AM	#5
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	I've never seen 2003 specific manuals. Here's a nice little compilation though. http://ken-gilbert.com/impreza-manuals __________________ Slow and low, that is the tempo.

2009-03-29, 09:53 AM	#6
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	Yeah, the funny thing is, I KNOW there's an extra pin on the '03 ECUs compared to '02, so at least one wire difference in the bulkhead harness. Otherwise, should be the same. What I really need to know though is if there are changes in the front and engine harnesses. __________________ FWD is the new AWD

2009-04-04, 05:08 PM	#7
rubberbiscuitt EJ22 Join Date: Mar 2006 Location: south lake tahoe Posts: 234 Car: L just push the brake pedal.	wasnt there an abs change in 7/02? __________________ www.monzospeed.com

2009-04-04, 07:26 PM	#8
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	I thought that was just a programming thing. __________________ FWD is the new AWD

2009-04-04, 07:56 PM	#9
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	ABS software change for '02-'03 cars and I think was made in '04. Front caliper changed late '02 model year, no brake related wiring change as far as I know. __________________ I am a Commodore PET --- Now get off my lawn you kids...

2009-04-06, 10:35 AM	#10
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	There was a CSP that allowed you to upgrade to the newer ABS ECU. I was able to get it done before installing my SS lines. __________________ Slow and low, that is the tempo.

2009-04-06, 10:40 AM	#11
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	There is no ABS ECU. Just the ECU, which got reflashed, not replaced AFAIK. __________________ FWD is the new AWD

2009-04-06, 10:43 AM	#12
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	No, there is one and they replaced it. ECU, in this case, stands for electronic control unit. Read the letter here: http://www.seccs.org/forums/showthre...hlight=abs+ecu __________________ Slow and low, that is the tempo.

2009-04-06, 10:48 AM	#13
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	I think that refers to the pump unit itself. Now that I think about it, I guess it has to have some serious onboard electronics, given all the wiring going into it. __________________ FWD is the new AWD

2009-04-06, 10:50 AM	#14
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	Control Unit would not be a pump. __________________ Slow and low, that is the tempo.

2009-04-06, 10:51 AM	#15
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	Or maybe not... down in that thread you refer to it costing $280, and the pumps are like $900. Now I'm confused. So where the hell is this thing? I've never seen anything I would think was an ECU in one. I haven't wrenched on many WRXs though. __________________ FWD is the new AWD

2009-04-06, 10:54 AM	#16
cody Candy Mountain Real Name: Cody Join Date: May 2005 Location: Californication Posts: 7,751 Car: 03 Pussy Wagon, now with more pink! Class: TESP OMG Internet!	That I don't know. __________________ Slow and low, that is the tempo.

2009-04-06, 11:02 AM	#17
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	The ABS pump under the hood has the "ECU" built into it IIRC. I thought the firmware upgrade was swapping an EPROM out for one w/ the new program. __________________ Is you is, or is you ain't, my con-stit-u-ints?

2009-04-06, 11:05 AM	#18
MPREZIV Token Real Name: Le Stig Afrique? Join Date: Jun 2005 Location: sitting next to a big yellow box Posts: 3,589 Car: 2001 Impreza 2.5 RS Class: 05 TDSP No, I won't work on your car. F your car*	Scott's right. ABS Control Unit and pump are one unit. __________________ "...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can f*ck for HOURS..."

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