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1999 RSTi Coupe
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10 Posts
Discussion Starter · #1 ·
So lately I've been working on a cluster swap putting a 2005 Cluster into a 1999 2.5 RS. I was going off the following pinouts:

(STI vs WRX pin out comparison)

Code:
Function		2000 RS Pin	2004 Sti pin
N/A			A1		
AT Oil Temp		A2		Unused
N/A			A3		
FWD 			A4		Unused
ABS Warning Light	A5		B3
N/A			A6		
N/A			A7		
Fuel Gauge		A8		A2
Coolant Temp		A9		A9
Coolant Temp Ground	A10		A8
			
N/A			B1		
N/A			B2		
N/A			B3		
N/A			B4		
VSS 2 Door ???		B5		B13
Door Warning Light	B6		B14
Seat Belt Warning Light	B7		B9
Illumination +12V	B8		C8
N/A			B9		
N/A			B10		
N/A			B11		
N/A			B12		
Turn Signal LH		B13		A7
Airbag Light		B14		B18
Turn Signal RH		B15		C3
Fuel Gauge (Warning?)	B16		???
			
Headlights +12V		C1		B30
Hi-Beam Light		C2		B29
Illumination Ground	C3		C6
Illumination +12V	C4		C8
N/A			C5		
Park brake/fluid light	C6		B19
Ignition +12V		C7		C7
Constant +12V		C8		C10
Tach RPM/ECM		C9		C5
VSS			C10		C2
N/A			C11		
N/A			C12		
Turn Signal Ground	C13		B4
Oil Press Warning Light	C14		B2
N/A			C15		
N/A			C16		
Charge Warning Light	C17		B1
CEL			C18		A6
(original guide for cluster wiring for an 04 sti cluster)


BUT

I experienced issues were the coolant gauge and fuel gauge didnt work correctly with those pin outs. After trial and error, here is an updated wiring for those plus a couple other things:

Code:
Function		1999 RS Pin	2005-07 Sti pin
N/A			A1		
Coolant Signal		A2		A11
Fuel Gauge		A3		A3
??? 			A4		
???			A5		
ABS Light		A6		B3
Low Fuel Warning	A7		n/a
???			A8		
???			A9		
Coolant Temp Ground	A10		A10
			
N/A			B1		
N/A			B2		
N/A			B3		
N/A			B4		
Door Warning Light	B5		B13
Door Warning Light	B6		B14
Seat Belt Warning LightB7		B9
Illumination +12V	B8		B24
N/A			B9		
N/A			B10		
N/A			B11		
N/A			B12		
Turn Signal LH		B13		A9
Airbag Light		B14		B18
Turn Signal RH		B15		C3
???			B16		
			
Headlights +12V		C1		B30
Hi-Beam Light		C2		B29
Illumination Ground	C3		C6
Illumination +12V	C4		C8
N/A			C5		
Park brake/fluid light	C6		B19
Ignition +12V		C7		C7
Constant +12V		C8		C10
Tach RPM/ECM		C9		C5
VSS			C10		C2
N/A			C11		
N/A			C12		
Turn Signal Ground	C13		B4
Oil Press Warning Light	C14		B2
N/A			C15		
N/A			C16		
Charge Warning Light	C17		B1
CEL			C18		A6
Its very similar however the A connector seems to be very different. This solved most of my issues. EXCEPT for two (maybe three): BRAKE light is always on, and ABS light NEVER comes on, airbag light is on (granted it was on with the GC8 cluster so this appears to be working). I have the connectors for the STI and GC8 clusters still wired (dont worry, no wires are crossed) so I have the ability to check function on the GC8 cluster. ABS and brake both worked on the GC8 cluster.

Here's the fun about the brake debacle: With the GC8 cluster in the car (and car is on), the line going to the hand brake has 14V. Pull the ebrake and it gets grounded, reading 0V (duh), and the light comes on in the cluster. Swap to the STI cluster, the line now has 0V. All the Time. Which makes me think either something in the cluster isnt routing power where it should be, or, I wired something wrong. I have two 2005 STI clusters and the problem is not isolated to one cluster.

ABS: is it possible its a reverse circuit? sure. but, I would think that it would be stuck constantly on in that case. When the cluster powers up, normally the ABS light is supposed to come on briefly, then turn off. Mine stays dark the entire time. Is the wiring on the cluster different than what I figured out?

These two lights are driving me bonkers. If anyone has any info on the wiring on the 99 2.5 rs/impreza cluster, or what page in the FSM its on, I owe you big time. Or, if they have any info on the STI cluster that explains the odd behavior, I'll take that too.

What have you guys done/experienced? Is the 04 cluster that much different than the rest?
 

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94&93 vr4, 94 rx7, 98 2.5rs, 95 Supra TT
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360 Posts
From my experience with it (05 cluster into an 98 rs), the 05 clusters are mixed. All of the 04 clusters you can press one of the buttons to get to ILL to appear on the cluster and control the brightness. 06-07 sti clusters the illumination is controlled by the turn signal stalk dial. For 2005 it seems like some cars came with one or the other or maybe they are all like the 06/07 style.

I had bought an 05 because I read that they had the push for ILL, but mine doesn't do that. So I had to wire it into the stock dimmer switch for brightness which meant I had to cut the existing wires that went to the dimmer switch and tie them together so my climate lights will be lit full brightness all the time with no adjust ability.


This was my wiring diagram when I did mine. There are some notes on the second tab as well.

http://802projects.com/documents/gaugeclusterwiring.xlsx


As for the brake light.... Mine was the same way. I looked at the oem wiring diagram and I think something in the abs module is grounding it out which is why the ebrake makes no difference. On the diagram it looks like you could just snip a connector to rule this out (ie cut a trace on the circuit board of the cluster). I was going to try it, but after opening up my cluster the circuit board stuff was not as clear as the wiring diagram so I didn't touch it. Instead I took a little piece of black electrical tape and stuck it over the brake light spot BEHIND the gauge overlay. Now it's on but I can't see it.


I left the A2 connector on the sti (abs wire) not connected so that light never comes on either.
 

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1999 RSTi Coupe
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10 Posts
Discussion Starter · #3 ·
I have one of the ones where I can use the cluster buttons to change the brightness. So I'm glad I have one of those.

Hmmm, interesting not about the abs info in the cluster interfering with the ebrake signal. I had a feeling thats what was happening. Do you think its throwing a ground fault because it cant find the EBD system? Seeing as to how there's two ABS inputs for these clusters, one of which being EBD.

I currently have tape over it as well haha. Might try and futz around around with adding a spoof signal or ground to the EBD input and see if that does anything. Gotta be careful because its easy to fry stuff.

I actually figured out the ABS warning light on the B3 (STI side) is reversed from the '99 GC8 clusyer wiring. Grounded on the GC8 cluster is light on. Grounded on the STI cluster is light off. A 12V input turns the light on on the STI cluster. So, a grounded trigger input from the GC8 cluster ABS wire can cause a +12V relayed signal to go to the STI B3 input. (Hopefully that doesnt fry anything, or need the A2 input to be functional)
 

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1999 RSTi Coupe
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10 Posts
Discussion Starter · #4 ·
UPDATE

I think I figured it out. So, the STI cluster is looking for input from the EBD on pin A2. Namely. a ground. Once A2 is grounded, the ebrake functions as normal. What I didnt check was the voltage prior to pulling the cable. I'm assuming its 12-14 but It may be different. Which may effect DCCD inputs for aftermarket controllers for the e-brake.

But, the updated wiring is:

Code:
Function		1999 RS Pin	2005-07 Sti pin
N/A			A1		
Coolant Signal		A2		A11
Fuel Gauge		A3		A3
??? 			A4		
???			A5		
ABS Light		A6		B3 (Reverse Circuit)
Low Fuel Warning	A7		n/a
???			A8		
???			A9		
Coolant Temp Ground	A10		A10
EBD (Ground this wire)  n/a              A2
			
N/A			B1		
N/A			B2		
N/A			B3		
N/A			B4		
Door Warning Light	B5		B13
Door Warning Light	B6		B14
Seat Belt Warning LightB7		B9
Illumination +12V	B8		B24
N/A			B9		
N/A			B10		
N/A			B11		
N/A			B12		
Turn Signal LH		B13		A9
Airbag Light		B14		B18
Turn Signal RH		B15		C3
???			B16		
			
Headlights +12V		C1		B30
Hi-Beam Light		C2		B29
Illumination Ground	C3		C6
Illumination +12V	C4		C8
N/A			C5		
Park brake/fluid light	C6		B19
Ignition +12V		C7		C7
Constant +12V		C8		C10
Tach RPM/ECM		C9		C5
VSS			C10		C2
N/A			C11		
N/A			C12		
Turn Signal Ground	C13		B4
Oil Press Warning Light	C14		B2
N/A			C15		
N/A			C16		
Charge Warning Light	C17		B1
CEL			C18		A6
 

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1999 RSTi Coupe
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10 Posts
Discussion Starter · #5 ·
Another question I have: Does the 2.5 have seat belt indicators on the original cluster?

I see everyone labels them on the pinout tables, but, I've never actually seen it on my cluster. Don't know if mine are broken or not
 

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2001 Impreza 2.5RS+T 2001 Legacy GT
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1,248 Posts
There is an indicator but no sensors. It goes out after X seconds whether you connect the belt or not
 

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1999 RSTi Coupe
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10 Posts
Discussion Starter · #7 ·
You wouldn't happen to have a photo of the light would you?

Sent from my Phone using Tapatalk
 

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1999 RSTi Coupe
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Discussion Starter · #8 ·
I determine the cause of my airbag issue once and for all.

First: there are no srs connectors going to the seats in a 1999 2.5 rs. I can't speak for other years, but for mine there are none.

So, after thinking I had a faulty srs module, I ponied up and bought a brand new one from Subaru. Still the airbag light persisted. Okay, so, it wasn't the module. Neat. I then continuity checked the entire harness. No open circuits. Then I checked every wire against all the others. I found two wires crossed with each other: airbag signal to cluster, and a ground. So, I disassembled the entire harness looking for the cross. There was none.

Turns out, inside the large connector in the driver foot well area, there's a shunt. Inside the connector. It looks like all the other locking airbag connectors with the green push tab you have to push in to unlock the connector. Turns out this one doesn't lock anything. It's spring loaded like the rest, so when it's pushed out by the spring, it grounds the signal wire and turns on the light on the dash. When it's pushed in and zip tied compressed, everything works like normal.

Now, for giggles and a little bit of crying, I put my old airbag module back in and looked at what codes there were. Which was none. So, that module was fine and I didn't need to spend $800 on a new module. Oh well, at least I figured it out. So that mystery has been solved

Sent from my Phone using Tapatalk
 

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Cluster Specialist
1999 Impreza RS - WRB
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503 Posts
I determine the cause of my airbag issue once and for all.

First: there are no srs connectors going to the seats in a 1999 2.5 rs. I can't speak for other years, but for mine there are none.

Just for thread information: None of the GC/GF series Imprezas were ever equipped with seat-equipped airbags. This is not introduced until 2005 or 2006 for Subaru (IIRC).
 

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1999 RS
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21 Posts
How did this swap go? I’m doing this swap very soon 99rs to 05STI. If you have an updated wiring, please let me know! If the most “recent“ wiring diagram is up to date let me know too lol. Can’t believe i just stumbled on to this post. :) thanks!
 
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