2002 WRX harness, pictures of each connector?

[Pearldrummer7]

And the wiring nightmare begins! (In my apartment...working late all week, and will be burning the midnight oil and going home for lunch to do the wiring)

This is a 2002 WRX harness (plugging into an EJ257/205 hybrid) for my 818R build, which I intend to make street legal. I will be keeping some options for us R guys, such as wipers, blinkers, maybe cruise control etc.
I'm going to document it the best I can. It's a total work in progress and is definitely not as thorough as Craig's thread, but hopefully it will clear up a few differences between the earlier and later WRXs.



I think I will go forward with this. Currently, I plan to delete:

-All airbag wiring
-All wiring to doors (maybe shorting the door sensors, maybe just "deleting" the door light bulb from the cluster)
-Fog lights
-HVAC
-Power steering
-Fuel evap sensors
-ABS(can I just remove all of this?)
-interior lighting/aux power(might keep 1 12V supply just in case)
-all fuse boxes, replacing them with a small circuit breaker panel (for safety on a track, for ease of replacement, for weight/space/looks, "thermal memory" purposes, and because race car. I do understand the potential for slower response times, and will have to look into specs before pursuing this fully)
-Probably more that I'm not remembering right now.

PLEASE feel free to give feedback, especially if you think I could be doing something better. I'm an EE but I am pretty new to this kind of wiring, having rarely tinkered with harness things.

In the mean while, I don't have a good idea for what to use for covering the wires. My WRX has some extra wiring running externally, and I ran some high temp fuel line covering over the wires to protect them. What's everyone here think is the best solution? Plastic tubing?

[wleehendrick]

I could pretty easily do that for most connectors, if anyone thinks that'd be useful!

Craig has done a great job documenting the 06 harness here: Wiring Guide: 06 WRX Sedan with Auto AC/HVAC (http://thefactoryfiveforum.com/showthread.php?11880-Wiring-Guide-06-WRX-Sedan-with-Auto-AC-HVAC).

If the 02 is significantly different it might be appreciated by others, but I have on 06 and will be following Craig's guide.

[Pearldrummer7]

Wow! Great thread! Sorry to tread on it; I'm glad it's been done probably better than I could do it!

[Xusia]

I have a 2003 donor, so I for one really appreciate the effort!

[Pearldrummer7]

Xusia, alright! I may just do it. There are a lot of people using the 2002-2003 harnesses, from what I've seen. I will try to bring it up to the standard that Craig's thread is at!

[STiPWRD]

This would be perfect Frank! I also have an 02 harness. My plan was to follow Craig's guide and remove SRS, speakers, HVAC, door wiring, power steering, fuel evap sensors (and probably forgetting a few other things here). I'm going to keep ABS in case I want to run it in the future. Then, test fit it in the kit, make sure the car starts and then start trimming/lengthening wires. I'm not sure if I will remove the fuse box yet - on the one hand it would save some weight but I'd lose over current protection.

[Pearldrummer7]

STiPWRD,

I plan to delete the fuse box and replace it with a panel of circuit breakers. Same level of protection, but instead of having to replace a fuse in a pinch(say, on a track when something electrical craps the bed), you could press a button and limp the car to safety (or...ignore it for a few laps ;) )

That sounds about right for me. I'll keep updating the first post in this and try to neaten everything up. It'll look better than the crap quality and disorganization I have now, I hope!

Frank

[theburner9]

I would also be eternally grateful to you for doing a thread like this. I'm using an 03 harness. On your example listed above, would you simply trace every wire on the abs plug and snip it at the furthest point? I'm just worried about cutting wires that are potentially tied into something else.

[Pearldrummer7]

theburner9,

Yup! That's the idea, at least. I have the wiring diagrams from ken-gilbert, and will be double and triple checking everything before I cut it away. While Craig's guide is amazing, I feel there are a few too many differences between the 2002-2003 and the 2006. I think we got the "easier" ones, for a couple reasons.

Frank

[Pearldrummer7]

Alright, here's what I'm thinking for formatting. I welcome feedback on this format and on my accuracy of the wiring. It's based off of my labeling, intuition, and memory, so there are bound to be errors. I think together we can make a good list.

http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/engineharness_zps3a5fc7ef.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/engineharness_zps3a5fc7ef.jpg.html)
Here is the engine bay section of the harness. It goes below the HVAC system in the passenger seat, through the front of the engine bay, to the main (relay) fuse box, then in to the driver footwell's fuse box.
Unfortunately, I did start tearing off plastic/rubber/Airbag wiring before I decided to take pictures of this. The airbag wiring is always easy to spot and came right out of this section of the harness without any issue. The harness had a ton of nasty electrical tape on it, plastic tubing, and rubber gaskets for entering/leaving the car. They're in a trash bag, and I intend to weigh all of the scrap once it's done to see total weight savings.

1.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0167_zps0de11221.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0167_zps0de11221.jpg.html)
(keep) To fuse box under driver footwell. Maybe some wires can be trimmed from this, but that is TBD at this point.

2.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0168_zps2ff63f98.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0168_zps2ff63f98.jpg.html)
(keep) to engine itself. Definitely keep [F60, F61]

3.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0169_zpsc557f376.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0169_zpsc557f376.jpg.html)
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0170_zpsb91d3e6c.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0170_zpsb91d3e6c.jpg.html)
(optional delete)There are two plugs here, One is front washer, one is rear washer (not used on sedan). It's clear by the difference in dirt which one has been plugged in and which one hasn't on mine. I'll be keeping the front one for street legality. [F32, F33]

4. Fuse box. Whew. More on this at a later date. Hopefully delete and replace with circuit breakers.

5.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0171_zps8fe256bf.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0171_zps8fe256bf.jpg.html)
(optional delete) Front ABS sensor. I am deleting [F94, F95]

6.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0173_zpsfd3856c1.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0173_zpsfd3856c1.jpg.html)
(delete) AC pressure switch [F79]

[Pearldrummer7]

Damn. 7 images per post. Okay, I guess I'm gonna raise my post count a little bit!


7.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0174_zps0540368c.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0174_zps0540368c.jpg.html)
(delete) AC compressor [F24]

8.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0175_zps0ab48581.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0175_zps0ab48581.jpg.html)
(keep) Alternator [F26, F25(ground)]

9.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0177_zpsabcfe8d3.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0177_zpsabcfe8d3.jpg.html)
(delete) side markers [F52, F53]

10.(I think delete) Fog lights, I'm almost certain. They were all cut up and spliced into HID controllers on my car. If anyone has pictures of these, please share them. If not, I'll just be deleting these wires. [F6, F21]

11.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0178_zps5b8376ff.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0178_zps5b8376ff.jpg.html)
(keep) Headlights! Two of them, obviously. Save these for use with the FFR lights. [F7, F23]

12.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0180_zps95f0f1a0.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0180_zps95f0f1a0.jpg.html)
(optional delete) Horn.There are two of these plugs. I'll be keeping at least one for street legality. [F5, F47]

[Pearldrummer7]

13.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0182_zps3bfa526b.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0182_zps3bfa526b.jpg.html)
(delete) side reflectors [F52, F53]

14.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0183_zpsc097f7e1.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0183_zpsc097f7e1.jpg.html)
(optional delete) ABS Module, I will be deleting this one. It's no small feat! These wires go everywhere. [F49]

15.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0181_zps12793869.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0181_zps12793869.jpg.html)
(keep) Cooling fan plugs, at least keep one of these. I'm keeping both because I'm not sure which length is better suited for the run yet. [F16, F17]

16.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0186_zps663bd737.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0186_zps663bd737.jpg.html)
Keeping this for now. Mostly or entirely ABS stuff, Hopefully I can delete this[F76]

17.
http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0179_zps8a1261e7.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0179_zps8a1261e7.jpg.html)
(keep)Blinkers. Two of em. [F4, F3]


No clue what my two "?" connectors are. If they don't have a tag on them, it's almost safe to assume that they weren't plugged in on my car. If you have any insight, let me know. I'll post pictures of them soon.

http://i1158.photobucket.com/albums/p619/Frank_LaBarbera/818R/Donor/Wiring/IMG_0184_zpse552a3b4.jpg~original (http://s1158.photobucket.com/user/Frank_LaBarbera/media/818R/Donor/Wiring/IMG_0184_zpse552a3b4.jpg.html)
Upper right "?" guy. I have no clue what this is.

[metalmaker12]

The green one is the alternator plug,,, scary lol, the large white female connector has some important stuff within it, the white/ red wire is the starter signal etc etc. mechie has a well documented thread

[Pearldrummer7]

The green one is the alternator plug,,, scary lol, the large white female connector has some important stuff within it, the white/ red wire is the starter signal etc etc. mechie has a well documented thread

Thanks! I know he does; from what I've seen there are some differences between the 02 and 06 harnesses, and I'm trying to cover those differences somewhat explicitly.

[Pearldrummer7]

Whew, figured out a bunch of stuff and trimmed some wires out. AC pressure switch, side lights, fog lights.

Considering deleting ABS but it isn't nearly clear enough to me yet, I'll keep working on that.

[metalmaker12]

The abs controller has most of the wires to it on its harness side. The sensor wires (yellow and black in gray sleeve I believe ) go to there corresponding wheel area. The other side has a cluster signal wire and a common ground. To fully delete it you need it all gone. Follow up with your schematics, but as you look at it you will see were I am going. Delete all airbag yellow wire cover crap. Etc etc have fun

[Pearldrummer7]

The abs controller has most of the wires to it on its harness side. The sensor wires (yellow and black in gray sleeve I believe ) go to there corresponding wheel area. The other side has a cluster signal wire and a common ground. To fully delete it you need it all gone. Follow up with your schematics, but as you look at it you will see were I am going. Delete all airbag yellow wire cover crap. Etc etc have fun

Thanks! It's all making a lot more sense now, actually. I printed out some of the wiring and am tracing the circuits back. Ken Gilbert's wiring diagrams are fantastic; way better than I expected. Thanks for the help, Metalmaker!

[GUNS]

Any more updates? This is extremely helpful. Thanks for putting in the effort.

[Pearldrummer7]

Ah so sorry about this. I have more pictures taken but I haven't gotten the chance to label them or post them yet. I'll get on it as soon as I can! More to come!

[gwarden]

Ah so sorry about this. I have more pictures taken but I haven't gotten the chance to label them or post them yet. I'll get on it as soon as I can! More to come!
Did you abandon us?
Getting ready to tackle this part of the journey

[Pearldrummer7]

Did you abandon us?
Getting ready to tackle this part of the journey

Not exactly. I got my kit around this time, and haven't touched wiring since. I'm probably 10-14 days out from starting the wiring adventure myself (well, installation) and plan to document it all quite well.

[Scargo]

After picture #17 you say you have no clue what the two connector are for. I would say they are for the vapor canister purge solenoid that has to do with venting gas vapors.
http://dgzmd7u6z2by7.cloudfront.net/partimage/EMX/1AEMX00074/large.JPG
On my '08 STi I have a similar solenoid just to the right of the alternator and to the left of the power steering pump and it's attached to the intake manifold. You probably won't be needing it or the connectors.
HAH! See this recent post on simplifying the EJ. (http://thefactoryfiveforum.com/showthread.php?9288-Simplifying-the-EJ&p=175524&viewfull=1#post175524)
Are they in the area of the alternator/power steering pump? On my STI I have three of them that are exactly alike and the third one is for the coolant temperature sensor. I didn't see that plug identified in your list. I believe on earlier cars like yours it is gray and triangular. The sensor is mounted on the cast aluminum coolant crossover pipe.

[CU9DZ]

I am taking wires out of the white connector (F74) now. I have a thick white/red wire, a white/black, a green/black, a light green/yellow left. Which ones do I keep ?
Dave

[Pearldrummer7]

Okay! A little hiatus, but I'm back on wiring now that it's cold in the garage.

Splicing the fuel pump and level sensor right now. These are the connections I'm planning to make for them:

https://farm8.staticflickr.com/7462/15835795138_5582e79e16_c.jpg (https://flic.kr/p/q8mAbE)
https://farm8.staticflickr.com/7481/16021281571_387e15c70f_c.jpg (https://flic.kr/p/qpKfQB)
edit: crap. I think this is the NA picture.

Here's a live-action shot of the connectors for the level sensor:
https://farm8.staticflickr.com/7501/16023221225_53fee617e7_c.jpg (https://flic.kr/p/qpVcqV)


Overall fuel harness picture(individual connector pictures coming soon to a thread near you) :
https://farm8.staticflickr.com/7463/15403749353_15560b71b8_c.jpg (https://flic.kr/p/ptbf2p)

[CU9DZ]

What did you use for a grommet where the wiring, throttle cable and battery cable go through the front firewall? The hole is just under 2" diameter. I found grommets for the shift cables and there is a rubber grommet for the steering shaft. The build manual shows a black rubber piece in one pic. but doesn't show a part number or instructions.
Dave

[Quiny]

I just used 3/8 inch rubber hose slit the long way and glued in with super glue.

[Pearldrummer7]

I just used 3/8 inch rubber hose slit the long way and glued in with super glue.

I'm going to do the same.



I found I can delete the entire Integrated Unit on my 2002 harness (connectors B280 and B281). All of the connections go to dimmers for interior lights, keyless entry, seatbelt warning light, door locks, etc. Nothing "important" seems to be on these two connectors. Definitely not the case for anyone who wants to retain things like electronic door locks, etc.

https://farm9.staticflickr.com/8644/15872710167_e5a3f7e021_c.jpg (https://flic.kr/p/qbBMJF)

[iblackwe]

This is a great help,
I am trying to remove my stereo wiring plug and I have traced a wire from the stereo connector to the cruise control switch (Brown w/ white stripe). I was wondering if you had any insight on this as I want to keep cruise control but I want to wire my own stereo without the stock harness.

Thanks,
Ian

[iblackwe]

Also, where did you get those wiring diagrams/schematics that indicate the wire colour? I have the 2002-2003 subaru impreza service manual but I can't seem to find these within it, did you get them from a separate document?

Thanks,
Ian

[billjr212]

I'm going to do the same.



I found I can delete the entire Integrated Unit on my 2002 harness (connectors B280 and B281). All of the connections go to dimmers for interior lights, keyless entry, seatbelt warning light, door locks, etc. Nothing "important" seems to be on these two connectors. Definitely not the case for anyone who wants to retain things like electronic door locks, etc.

https://farm9.staticflickr.com/8644/15872710167_e5a3f7e021_c.jpg (https://flic.kr/p/qbBMJF)

I may have misunderstood the wiring diagram, but I thought the back lighting for the gauge cluster and hazard button was also effectively routed through the integrated unit. Are you using something other than the Subaru cluster or did you figure out a workaround to skip the integrated unit?

[billjr212]

This was my initial summary for the plugs in a 2004 WRX:

B280 (Blue) - Integrated Module

1 LR Power/Keyless entry Delete
2 WB Power, Fuse 3 FB-33 ?
3
4 B Ground
5 L Room Light Delete
6 Or Door locks Delete
7 RG Door locks Delete
8 R Driver door lock Delete
9
10 L Rear Defog, ECM FB-15 Delete?
11 BL Seat Belt Light Delete
12
13 B Ground
14 OrW Lighting - various Keep portion?
15
16

B281 (Gray) - Integrated Module

1 R Rear Defog switch Delete
2 YB Key illum light Keep?
3 BrR Seat Belt Switch Delete
4 BrY Auto trans only? X
5
6
7 Y Keyless entry module/FR door switch Delete
8 L Or Driver door switch and light on cluster Delete
9
10
11 YR Driver door lock button, keyless entry Delete
12 RW Driver door lock button, keyless entry Delete
13 OrW Keyless entry module Delete
14 OrB Keyless entry module Delete
15 V Various lighting - power Keep portion?
16 GrR Lighting switch B71 Keep
17 LW Trunk light Delete
18 L Lighting switch B71 Keep
19 GR Power FB-20, Fuse 11 Keep
20 WR Key Warning Switch/Keyless entry Delete

[xxguitarist]

Also, where did you get those wiring diagrams/schematics that indicate the wire colour? I have the 2002-2003 subaru impreza service manual but I can't seem to find these within it, did you get them from a separate document?

Thanks,
Ian

Here you go, Ian.
http://ken-gilbert.com/wrx/mans/7%20-%20WIRING.PDF

[Pearldrummer7]

I may have misunderstood the wiring diagram, but I thought the back lighting for the gauge cluster and hazard button was also effectively routed through the integrated unit. Are you using something other than the Subaru cluster or did you figure out a workaround to skip the integrated unit?

This is a good question. I plan to wire the "interior lights" (dash, hazard, backlight for switches, extra gauges, and perhaps a floor light) on the headlight switch. Splice them into that 12V supply that feeds the headlights.

I drive with my lights on during the day, so it wouldn't bother me to have to flick the headlight switch on before being able to see my dash well.

[Pearldrummer7]

This was my initial summary for the plugs in a 2004 WRX:

B280 (Blue) - Integrated Module

1 LR Power/Keyless entry Delete
2 WB Power, Fuse 3 FB-33 ? Fuse for keyless entry, delete
3
4 B Ground
5 L Room Light Delete
6 Or Door locks Delete
7 RG Door locks Delete
8 R Driver door lock Delete
9
10 L Rear Defog, ECM FB-15 Delete?i say delete!
11 BL Seat Belt Light Delete
12
13 B Ground for keyless entry, delete
14 OrW Lighting - various Keep portion? I figure I can get lighting from almost anywhere, so I'm deleting for the sake of getting rid of the IU
15
16

B281 (Gray) - Integrated Module

1 R Rear Defog switch Delete
2 YB Key illum light Keep?Nothing on 2002 WRX wiring diagram(or so I wrote down...)
3 BrR Seat Belt Switch Delete
4 BrY Auto trans only? X
5
6
7 Y Keyless entry module/FR door switch Delete
8 L Or Driver door switch and light on cluster Delete
9
10
11 YR Driver door lock button, keyless entry Delete
12 RW Driver door lock button, keyless entry Delete
13 OrW Keyless entry module Delete
14 OrB Keyless entry module Delete
15 V Various lighting - power Keep portion? I deleted all of the interior lights to get rid of the IU. I think pulling lights and putting them on a switch on the dash (or HL switch) is easy enough.
16 GrR Lighting switch B71 Keep
17 LW Trunk light Delete
18 L Lighting switch B71 Keep
19 GR Power FB-20, Fuse 11 Keep
20 WR Key Warning Switch/Keyless entry Delete

Marked up my findings in bold. Similar to yours!

[iblackwe]

Here you go, Ian.
http://ken-gilbert.com/wrx/mans/7%20-%20WIRING.PDF

Thanks a lot, very very helpful

[Jaime]

I may have misunderstood the wiring diagram, but I thought the back lighting for the gauge cluster and hazard button was also effectively routed through the integrated unit. Are you using something other than the Subaru cluster or did you figure out a workaround to skip the integrated unit?
Backlighting goes through the integrated unit. A simple workaround is to wire up an on/off switch that grounds the Orange/White wire to turn the lights on full brightness. More complicated is to create a simple pulse width dimmer that's controlled by the dimmer knob. It should only be about ten bucks worth of electronics parts.

[Pearldrummer7]

Backlighting goes through the integrated unit. A simple workaround is to wire up an on/off switch that grounds the Orange/White wire to turn the lights on full brightness. More complicated is to create a simple pulse width dimmer that's controlled by the dimmer knob. It should only be about ten bucks worth of electronics parts.

Yup, that's my idea. I intended to only have it be a toggle switch, not on a dimmer.

[Harley818]

I am dieting an 02 harness. I have the wiring diagrams.
How do I know whether to ground a wire, or just isolate it, to keep integrity of the circuit when I delete something?

I deleted all the keyless entry stuff, security, ABS, A/C, PS,TGV's, EGT, PW, PDL, defogs, blower fans and more.
I left in the ODB and check circuits, diagnosis connectors etc.
In most cases I just cut it out right back to the FB (fuseblock) or MB (main breaker panel), or to a multiple splice.

For example, for the A/C, I cut out the relay, thermo switch, pressure switch and the wires right back to the FB and to the ECM. I just insulated them at the ECM so they don't touch anything. Should I have grounded them?
Another example, the ABS system I cut completely out back to the FB, but left the RW wire from the FB to the combination meter. There is a LgY wire from the combination meter that goes to the ABS control module - should I ground this one? or just leave it hanging/isolated?

thanks for the help.

[Bob_n_Cincy]

I am dieting an 02 harness. I have the wiring diagrams.
How do I know whether to ground a wire, or just isolate it, to keep integrity of the circuit when I delete something?

I deleted all the keyless entry stuff, security, ABS, A/C, PS,TGV's, EGT, PW, PDL, defogs, blower fans and more.
I left in the ODB and check circuits, diagnosis connectors etc.
In most cases I just cut it out right back to the FB (fuseblock) or MB (main breaker panel), or to a multiple splice.

For example, for the A/C, I cut out the relay, thermo switch, pressure switch and the wires right back to the FB and to the ECM. I just insulated them at the ECM so they don't touch anything. Should I have grounded them?
Another example, the ABS system I cut completely out back to the FB, but left the RW wire from the FB to the combination meter. There is a LgY wire from the combination meter that goes to the ABS control module - should I ground this one? or just leave it hanging/isolated?

thanks for the help.

The best / safest thing to do with any wires dieted is to insulate them. (I use a piece of heat shrink)
That way if there is power on the wire you do not damage anything.

There are some exception to this rule. There might be a wire from the seat belts or abs that turn on a warning light on the cluster.
My suggesting hear is to wait to see what doesn't work on the cluster and tackle it then.
Bob

[Pearldrummer7]

I am dieting an 02 harness. I have the wiring diagrams.
How do I know whether to ground a wire, or just isolate it, to keep integrity of the circuit when I delete something?

I deleted all the keyless entry stuff, security, ABS, A/C, PS,TGV's, EGT, PW, PDL, defogs, blower fans and more.
I left in the ODB and check circuits, diagnosis connectors etc.
In most cases I just cut it out right back to the FB (fuseblock) or MB (main breaker panel), or to a multiple splice.

For example, for the A/C, I cut out the relay, thermo switch, pressure switch and the wires right back to the FB and to the ECM. I just insulated them at the ECM so they don't touch anything. Should I have grounded them?
Another example, the ABS system I cut completely out back to the FB, but left the RW wire from the FB to the combination meter. There is a LgY wire from the combination meter that goes to the ABS control module - should I ground this one? or just leave it hanging/isolated?

thanks for the help.

What Bob said above is a good idea.

I usually try to look at the diagrams and see what state things would "like" to be in. For instance, if I remove a sensor:
-Would it normally read high or low during track day conditions?(i.e. warm, no issues, etc.)
-How would this affect the circuit? (e.g. shorts a connection, grounds something, etc.)
-What other circuits does this affect? Can I still be OK if this sensor is mistakenly miswired?



I hope that makes a little sense.



In the case of your wire to the combination meter (which is poorly explained in the wiring diagram, I think) I would leave it hanging with some wire left on it for now. When you're up and running, you can take care of that as needed (I'm probably going to just remove those wires and pull the bulbs out of the meter :) )

[Harley818]

Yes, I was just isolating it with heat shrink as you are doing.
Just looking for confirmation that it is the right approach.
There are a few situations where the normal state would be grounded so I am identifying those and I'll deal with those one at a time once I try to start it up.
Its a lot easier now before I wrap the wiring and build in the shifter tunnel.

[Harley818]

Wondering if anyone knows what this is? Is it the ambient temp sensor?
3765637657

I am looking for the Ambient Temp sensor attached to F78. Connector is supposed to be two pin black. This one is * (neutral)
If I find it I might leave it in, otherwise I'll delete it.

[EODTech87]

That's the power window circuit breaker.

[Pearldrummer7]

I'm trying to remove some of the complexity on the car's wiring. Here's a big on I found that I'm convinced I can do without:


The original starter circuit involves a relay to disallow starting the car if it's not happy about security (that definitely is getting bypassed), a switch for the clutch to be down (that's a pain in the *** as getting in/out of this car isn't as easy as a normal car), and a relay that locks out starting if the clutch switch isn't down.
https://farm9.staticflickr.com/8668/15688975323_2513fb5125_c.jpg (https://flic.kr/p/pUo6Lx)


Here's the new circuit I propose for this:
https://farm8.staticflickr.com/7578/16308002192_55e7e9ed52_c.jpg (https://flic.kr/p/qR5LTA)


What's everyone think?

[Bob_n_Cincy]

I'm trying to remove some of the complexity on the car's wiring. Here's a big on I found that I'm convinced I can do without:


The original starter circuit involves a relay to disallow starting the car if it's not happy about security (that definitely is getting bypassed), a switch for the clutch to be down (that's a pain in the *** as getting in/out of this car isn't as easy as a normal car), and a relay that locks out starting if the clutch switch isn't down.

What's everyone think?

I left the clutch switch and starter interlock in the circuit. I would hate to reach in to start the car and forget it was an gear. Then have it drive off without me.

I left the starter interlock relay in because the clutch switch cannot handle the current pulled by the starter.
Bob

[Harley818]

I left the clutch relay in as well for the same reason..... don't want to have the car take off on me.
I bypassed the security and the OS system and spliced the WB to the WR......bypassing both of them.
Started it today for the first time.....after I grounded the clutch circuit .......worked like a charm.

[Frank818]

Does anyone know where I can find information on the purpose/use of each connector attached to the 2002-2004 steering column?

I have the WIRING PDF for a 2002, but there are no pictures of the steering column and on the column's switches, no way to identify which connector name (B68, B78, etc.) refers to what. So I don't know which ones I can delete and which ones to wire up with my custom harness and other custom devices of my own I plan on fitting.

[billjr212]

Frank - the easiest way I have found to identify connector numbers is to pick a wire that goes into the connector that is an unusual color combo and note it's position in the plug. Then do a "Ctrl + F" in the PDF file and search for that color combo.

For example, there is a Light Green with Black stripe wire in the top right corner of one of the plugs that goes into the steering column. Searching "LgB" in the PDF file (kind of a poor example, because Subaru uses this color combo a lot) pops a result on page 50 of the PDF in the cruise control system and tells me that plug number is B68. I can then switch my search term to B68 and find all the places in the diagram that reference that plug number and note what each of the 5 wires leads to.

Hopefully that helps a bit.

[Frank818]

Bill, good idea, of course it takes time, but we work with what we got. The colors are repeated multiple times but if the find function worked, one of them is what I look for. I'll try it!


Frank, I am looking at the clutch interlock as well. I couldn't figure out the 2 switches on the clutch, after looking at your diagram (not the hand written one, the more complex Subaru one :)) I think one is the security crap and the other the interlock switch. Good to know we still need the relay, I planned on dumping it too.

[Harley818]

Anyone know what this is for?
I labelled it turbo, and the vacuum line is connected to the intake.
3809938100

[Bob_n_Cincy]

Anyone know what this is for?
I labelled it turbo, and the vacuum line is connected to the intake.
3809938100
That is your waste gate solenoid.
also know as an ebcs (electronic boost control solenoid)
Bob

[STiPWRD]

Marked up my findings in bold. Similar to yours!

I'm dieting my 2002 harness now and wanted to make sure I understood the consensus on the Integrated module. In order to delete it completely:

On B280: Ground pin 4 (Black)
On B281: Keep pin 16 (GrR) Lighting switch to B71
On B281: Keep pin 18 (L) Lighting switch to B71
On B281: Keep pin 19 (GR) Power to FB-20, Fuse
Delete all other wires

What do I do with the wires I keep? I'm deleting all the interior lighting but want to make sure I can illuminate the combination meter (dimmer not necessary). Would I need an on/off switch to ground on the two wires that run to B71? Can they be spliced to use the same on/off switch?

Jaime also, mentioned wiring an on/off switch to GND on the Orange/White (on B281 pin 13) wire but this wire runs to the keyless entry module, which I already deleted. Do I need to worry about this OrW wire?

Thanks for the help!

Also, is anyone deleting the DRL system?

[Harley818]

I've cut my IM, security, and Keyless entry as well and plan to connect to power somewhere to light the instrument panel. I'm keeping my DRL though.

[Pearldrummer7]

Replacing the crap Subaru provides in the harness with heatshrink crimp connectors:
https://farm8.staticflickr.com/7414/16252760869_5018c218b2_z.jpg (https://flic.kr/p/qLcDyZ)


What's everyone else doing?

[wleehendrick]

Replacing the crap Subaru provides in the harness with heatshrink crimp connectors:

Yeah, I was surprised to see how splices were made in the factory harness... but it seems to work and it's cheap.


What's everyone else doing?

I was planning to use the same, but I decided to out-source... I dropped my harness off with Brian (iWire) this weekend.

[Bob_n_Cincy]

Replacing the crap Subaru provides in the harness with heatshrink crimp connectors:
What's everyone else doing?

I used post type terminal blocks with ring lugs on the wires. That way I could add wires as needed.
Bob

38417

[Harley818]

If I'm lengthening or shortening lines, I'm splicing with Pico crimp connectors and their crimper, then protecting/insulating with heat shrink. This gives a good mechanical connection and insulation.
The Subaru stuff I took apart all looked pretty clean and new given its 12 years old.

[jaw777]

I have a 2002 WRX. My car starts and the engine runs good, but I have a couple connectors that I need some help with. Pics below. Any help is greatly appreciated.

3868638687

[billjr212]

the black one is B82 - Diagnosis connector. I kept it - just in case.

The white one looks like B250 - Flash memory connector - also need to keep if you intend to reflash your ECU ever.