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Old 07-18-2012, 01:51 AM   #1
Jmhm17
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Anyone know ware a good tach signal is in the 08+ wrx's? Searched couldn't find anything,,


****UPDATE***
if you came across this in your search the Tach signal on 08+ WRX/STi's is the RED/GREY wire on the cluster harness.
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Last edited by Jmhm17; 07-23-2012 at 06:26 PM.
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Old 07-18-2012, 11:25 AM   #2
alt14
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The way I found mine on my 2.5i was take the cluster out and unplug it, then turn the car on and start testing the pins on the connector till you find it, I'm guessing your looking for it for a turbo timer or shift light? Just wire what ever it is up and try what I did above with it, in my case I had an old small prosport tach with an external shift light I felt like putting in just put the gauge in the glove box since I had no need for the gauge its self but I just stuck a small wire into the harness till I found the one that made the needle move. Hope this helps

Last edited by alt14; 07-18-2012 at 11:35 AM.
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Old 07-18-2012, 01:25 PM   #3
Jmhm17
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WIll the car start with the cluster unpluged? I didnt think it would.

I'm really suprised I cant find a schematic for which pin is the signal on that harness.. If we (08+ people) can get a diagram I bet this thread would help a lot of people out.
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Old 07-18-2012, 02:01 PM   #4
alt14
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Yep started fine for me, if it's like the older clusters there is three harnesses, try the one in the middle since that's where the tach is, but mine was on the right cause that's where they are on the na's 02-07 not sure if it makes a difference though, you will lose your trip miles though.

Somewhere like iag or agile I'm sure would know exactly which one it is for turbo models though
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Old 07-18-2012, 02:22 PM   #5
Jmhm17
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aw man! not my trip miles! lol thanks for the info, ill take a look its super easy to remove the cluster in this car, im wondering if they used the same colors do you remember what color wire? maybe it will give me a good place to start
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Old 07-18-2012, 02:25 PM   #6
alt14
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Not off hand but I can take it out after I get home tomorrow or later tonight
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Old 07-18-2012, 02:53 PM   #7
Jmhm17
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Thanks!
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Old 07-19-2012, 02:29 PM   #8
alt14
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I think it's a blueish green wire with a black stripe and silver box patterns on it
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Old 07-21-2012, 04:55 PM   #9
Jmhm17
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See pics..

Last edited by Jmhm17; 07-21-2012 at 06:11 PM.
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Old 07-21-2012, 05:58 PM   #10
Jmhm17
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This one?



and here are 2 shots of the connector. anyone else know? I guess I could use a volt meter and figure it out but this would be a good how to.. Id like to find out which is 12v switched and which is ground too..


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Old 07-22-2012, 11:38 AM   #11
Mucho Maas
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Quote:
Originally Posted by Jmhm17 View Post
This one?

and here are 2 shots of the connector. anyone else know? I guess I could use a volt meter and figure it out but this would be a good how to.. Id like to find out which is 12v switched and which is ground too..



I'm needing this info too. I'm trying to extract it from the factory manual, but am finding the going tough. It shows output to the tacho as a big arrow from a "Micro computer" in the combination meter (cluster). I've collated what I could (2009 MY Impreza), and from what I see, it seems to correspond reasonably well to your image.

#1 (WL) power
#2 (BrW) switched power
#3 ()
#4 ()
#5 ()
#6 ()
#7 ()
#8 (L) Brake Fluid level
#9 ()
#10 ()
#11 ()
#12 ()
#13 ()
#14 ()
#15 ()
#16 ()
#17 ()
#18 ()
#19 (GOr) Oil Pressure
#20 () Generator
#21 (BY) Ground
#22 (BY) Ground
#23 (Or) Ambient sensor
#24 (Sb) Ambient sensor
#25 ()
#26 (LgR) CAN receiver&receiver
#27 (P) CAN receiver&receiver
#28 ()
#29 (Y) Drive circuit, Clock
#30 ()
#31 (PG) Speedo (I/F, ABS control, VDC control, Nav, OP connector)
#32 () OP connector, ECM
#33 ()
#34 () TPM control
#35 ()
#36 () Airbag
#37 ()
#38 () ECM
#39 () Body integrated unit, OP connector
#40 ()

L = blue
WL = white/blue
Sb = light blue
BY = black/yellow
LgR = light green/red
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Old 07-22-2012, 01:56 PM   #12
Jmhm17
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Good info^ now I know I dont have to tap my fuses to get a switched 12v lol

I just tried hooking the shift light up to the wire I pointed out and nothing happend.. and FYI the car wont start with out the cluster so I cant even get a meter on it to attempt to figure it out.. my only other option is to tap every wire in the harness.. and I dont want to blow my shift light.. I tired multiple settings on the shift light as well (I have th Raptor perfomance one) and no luck, it seems like for these cars on my shift light all dip switches are down, for coil on plug motors, I tried the only other 4 cylinder option and still didnt work so im lost now..

come on you electrical gurus shine some line on this once and for all, im sure im not the first to put a shift light on this car lol
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Old 07-22-2012, 04:24 PM   #13
Mucho Maas
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Quote:
Originally Posted by Jmhm17 View Post
Good info^ now I know I dont have to tap my fuses to get a switched 12v lol

I just tried hooking the shift light up to the wire I pointed out and nothing happend.. and FYI the car wont start with out the cluster so I cant even get a meter on it to attempt to figure it out.. my only other option is to tap every wire in the harness.. and I dont want to blow my shift light.. I tired multiple settings on the shift light as well (I have th Raptor perfomance one) and no luck, it seems like for these cars on my shift light all dip switches are down, for coil on plug motors, I tried the only other 4 cylinder option and still didnt work so im lost now..

come on you electrical gurus shine some line on this once and for all, im sure im not the first to put a shift light on this car lol
I'm comfortable playing "what happens" with electrical things, but not so much electronic things.

Jmhm 17 - can you check my list to confirm the pinout colors are correct? Can you update the list to add wires I wasn't able to find in the schematics?
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Old 07-23-2012, 02:11 PM   #14
Jmhm17
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I can do the colors but i have no idea what they go to. whats bugging me is I have no idea if the wire is wrong, or there is a problem with my shift light..
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Old 07-23-2012, 03:48 PM   #15
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Im guessing the tach is controlled by a variable voltage out to the gauge cluster based on engine speed. As the engine speed increases, the voltage to the tach increases. What we need to know to figure out if your shift light is working properly is what is the max output voltage of your tach and what the max voltage the shift light is designed for.

Have you figured out how, once installed, you adjust your shift light? There are a few power supply options you can use to test your shift light, assuming its a simple red/black connection.

Ill try to catch up with you this week, maybe the Milford meet if youre going, and try to talk through it. Im pretty new to electronics myself, but this seems pretty straight forward.
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Old 07-23-2012, 04:57 PM   #16
Jmhm17
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hey check this out.. im going to try it now

http://www.youtube.com/watch?v=b4Opm...ature=youtu.be

got it to work, this is deff the tach signal.. btw on the Raptor Performance shift light the DIP switches should be set in 4 cyl mode not coil on plug so:
1: down
2: up
3: down

IMPORTANT
I made this mistake, there is a WHITE and RED wire that looks just like the Grey and red i acidently spliced this one (dont ware sunglasses when trying to see the colors lol). it is in fact the RED and GREY wire for the tac signal.

You can see i had to do it the old fashon way, i bought the wrong size splice connectors they didnt make it through the heat shrink on the cluster harness


This is the other side routed to the fuse box for switch power and ground


Final result



Last edited by Jmhm17; 07-23-2012 at 06:27 PM.
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Old 07-24-2012, 10:34 PM   #17
Mucho Maas
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Youtube to the rescue.

My shift light wiring for the 09 WRX. Tacho - pin 32, switched power - pin 2, ground - pin 21. I've collated whatever other info I could for the cluster pigtail on this model.

#1 (White/blue) power
#2 (Brown/white) switched power
#3 (Violet)
#4 empty
#5 empty
#6 empty
#7 empty
#8 (Blue) Brake Fluid level
#9 (White/red)
#10 (Grey)
#11 empty
#12 empty
#13 empty
#14 empty
#15 empty
#16 empty
#17 empty
#18 empty
#19 (Green/orange) Oil Pressure
#20 (Black) Generator

#21 (Black/yellow) Ground
#22 (Black/yellow) Ground
#23 (Orange) Ambient sensor
#24 (Light blue) Ambient sensor
#25 empty
#26 (Light Green/red) CAN system
#27 (Pink) CAN system
#28 empty
#29 (Yellow) Drive circuit, Clock
#30 empty
#31 (Pink/green) Speedo
#32 (Grey/red) Tacho, ECM
#33 empty
#34 (Red/yellow) TPM control
#35 empty
#36 (Light Green) Airbag
#37 empty
#38 (Light Green/black) ECM
#39 (Brown/red) Body integrated unit, OP connector
#40 (Red)
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Old 08-08-2012, 09:07 PM   #18
Jmhm17
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Nice! I hope people find this thread. It should be put on some how to list. Lots of good info here.
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Old 06-05-2013, 09:45 AM   #19
1wrxtra
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10 month bump to say thanks to Jmhm17 and Mucho Mas!

I was looking for this exact information. Also, Jmhm17 - thanks for updating your OP with the correct wire info. Great info in here.
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Old 06-11-2013, 08:46 PM   #20
Jmhm17
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I'm glad this helped some one. You are very welcome!
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