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Old 01-24-2006, 12:52 PM   #1
pioneer_sti
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Default Fix: How To Turn Off Rear Diff Light - STI Cluster Swap Into WRX

If someone has already figured this out, then my appologies for posting redundant information, but I couldn't find any fixes for this, only questions asking 'how to' and statements saying it can't be fixed, cause it's part of the STi's DCCD ciruit. Anyone who has swapped an STi gauge cluster into a WRX (or in my case a JDM 2004 STi cluster into a JDM 2002 STi) knows that one of the 'side effects' is the rear diff temp warning light does not go out. Some people have slipped a small piece of electrical tape under the overlay to block it, but I didn't want to do that, so some studying of the wiring diagrams and manual where in store for me. It turns out that the fix is simple , just ground the rear diff light terminal (B4 in i10 middle connector). The link below shows the rear diff temp light going on and off as I hold the wire to a ground and then remove it. http://member.newsguy.com/~gtfour/su..._rear_diff.avi

There is one catch. One my car (JDM 2002 STi), there wasn't a terminal in B4, so I either had to find a terminal from somewhere or look for another one that was not in use. I didn't bother with that route, and instead just remove the plastic cover at the back of the gauge, and then soldered a wire onto the leg for the B4 terminal, and ran this wire to a ground. WARNING: While the terminals on either side of B4 are both ground circuits, there are positive terminals in the i10 connector, so make sure your wire is soldered on properly. Also, try not to apply more heat than is necessary to the leg, or you may end up affecting the solder connection to the board. I also taped the wire to the back of the cluster so that any movement on the wire would not stress the solder joint.

As for where to ground the B4 wire, that's entirely up to you. I ran the wire down to the steering column where there was already a vacant hole for a 10mm bolt, and just added a ground eyelet and bolted it on there. There are other options, but please note I have not tried them. Splicing the B4 wire to the C6 wire (10 pin, single row, i11 connector), which is a ground, should also work. On my cluster, B27 and B28 where also grounds, but those may only be for the JDM models.

With this mod, the rear diff temp warning light will light up with ignition, and as soon as you start the car on, it will go out. I'm actually thinking about adding the rear diff temp switch. Why waste a perfectly good warning light, when it's as simple as running the same B4 wire to one terminal of the switch, and the other terminal to ground.

Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour

Last edited by pioneer_sti; 02-07-2006 at 08:56 PM.
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Old 01-25-2006, 01:46 AM   #2
o2sys
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nice~
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Old 01-25-2006, 08:11 PM   #3
Sokudo
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nice write up..thanks !
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Old 01-25-2006, 08:21 PM   #4
o2sys
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What if you have the R180 on your wrx and want to wire it up to the sti cluster as well to make it work?
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Old 01-25-2006, 10:17 PM   #5
Rizzo314
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Quote:
Originally Posted by o2sys
What if you have the R180 on your wrx and want to wire it up to the sti cluster as well to make it work?
That is what I plan on doing once I get ahold of the temp sensor from an r180.
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Old 01-26-2006, 01:27 AM   #6
pioneer_sti
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Quote:
What if you have the R180 on your wrx and want to wire it up to the sti cluster as well to make it work?
If the diff already has a temp switch in it, then it should have a connector with two wires on it. Since it is basically a switch, it shouldn't matter which wire you use so pick one and send it to ground, and then send the other to the B4 terminal in the cluster. If the temp switch only has one wire then send that to the B4 terminal in the cluster. From what I have studied in the manual, the switch should have 2 wires, one green and one brown. In the wiring diagrams the brown wire goes to ground and the green to the B4 terminal.

UPDATE I drove the car today on two 20 minute trips and the fix is working perfectly. No smoke, sparks, fire, explosions etc. coming from the cluster during sustained operation, which is always a good sign

Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour

Last edited by pioneer_sti; 01-26-2006 at 09:30 AM.
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Old 01-26-2006, 11:52 PM   #7
scoobdude
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the sensor is about 190 bucks

Did you by anychance get a hold of the jdm sti wiring diagrams. There is a fog light indicator i want to get to work, but i need voltages and locations. (mostly cause i am lazy)

Joe
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Old 01-27-2006, 06:21 PM   #8
pioneer_sti
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Quote:
Did you by anychance get a hold of the jdm sti wiring diagrams.
No, sorry, I did not, but if you ever get a hold of them, please don't forget me. While, a lot of wiring is the same as the rest of the world, I believe the JDM STi's have different connectors for the ECU, and a few other things, so wiring diagrams would come in very handy.

Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour
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Old 02-07-2006, 08:55 PM   #9
pioneer_sti
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UPDATE Well, fingers crossed, this is the final update. It's been over a week and all is fine, so I'd say this is a definite fix (and an alternate mod for use as a warning light), and there are zero unwanted side effects.

Dennis
1990 Toyota Celica GT-Four
2001 Subaru Impreza WRX STi
http://member.newsguy.com/~gtfour
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Old 03-02-2006, 12:55 PM   #10
o2sys
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i was about to this last night when i realized.....what color is the B4 wire??!?!!
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Old 03-25-2006, 02:35 PM   #11
o2sys
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Quote:
Originally Posted by o2sys
i was about to this last night when i realized.....what color is the B4 wire??!?!!
bump...still dont know what color is B4
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Old 12-27-2006, 05:34 PM   #12
Chapel
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*bookmark*
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Old 12-27-2006, 05:44 PM   #13
Chapel
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I see where B4 is, but is C6 always ground regardless of year? I'm thinking of grounding it there.
Also, B4 is useless to a WRX anyway, right? B4 says it's just a FWD Indicator light.
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Old 12-27-2006, 07:51 PM   #14
Chapel
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hmm, I have no wire or terminal in B4 on the connector...
I wonder if I could get a terminal to plug in there from Radio Shack and then some wire and ground it to C6.

My nerves aren't any good for soldering.

Also, if you plug the thing in without grounding it and turn the car on, you will blow your radio fuse
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Old 12-28-2006, 01:23 PM   #15
Chapel
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seems like B28 is the fuse blower
C9 is apparently the buzzer that people have been getting
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Old 10-01-2007, 12:35 PM   #16
ZLODEY
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Question

Quote:
Originally Posted by Chapel View Post
seems like B28 is the fuse blower
C9 is apparently the buzzer that people have been getting
Any update on what should be done with that Just cut C9 to stop this buzzer?
BTW do you have USDM STi cluster "start procedure" on JDM STi cluster? I don't And I have the latest JDM STi spec-C cluster...
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Old 04-08-2014, 11:11 PM   #17
sledge_hammer
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Sorry to bump this thread but Im having issues trying to get the pin into the b4 slot. Any ideas? I got the pins from an old obdII custer harness from a civic.
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