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Old 04-03-2010, 12:48 PM   #1
xxscaxx
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Default DIY: How to swap an 08 STi steering wheel into an 05 STi

How to swap an 08 GR steering wheel into an older model sti (05-07).

This writeup is for an 05 sti, but i know the 06-07 cruise control is the same (i think). you can probably do this for an 04 sti as well if you mod the wires to work with an 05 and up cruise control stalk (http://forums.nasioc.com/forums/show...cruise+control).

Before i start this, DO AT YOUR OWN RISK. I am not responsible for anyone else's car but my own. You are working with a explosive device and a dangerous one at that. TAKE YOUR TIME and double check EVERYTHING. do it right or dont do it at all.

ok, so...

before I start, this write-up wouldn’t be possible without the help of Dave (user name Nelly). He is the one who figured the wiring out, and id still be scratching my head in my garage right now if it wasn’t for him lol.

Im going to break this down into sections, if you see anything that is unclear let me know and ill go back and re-explain it. There is a LOT of stuff, and I might have missed something.

What you will need:
1) 08 sti steering wheel with buttons
2) PAC steering wheel control button unit (if you want the audio buttons…you need an aftermarket head unit to use this. I do not know how to wire this into a stock HU so please don’t ask me). The write-up uses the PAC SWI-PS. I do not know if the other models have different programming or wiring setups.
3) Balls for soldering
4) wire cutters, extra wire
5) 10mm, 17mm sockets
6) screwdriver
7) electrical tape

Removing your stock wheel
I don't have photos of this process, but this is easily obtainable on nasioc. i'll walk you through it.

Step 1 - pull on a flat surface and straighten your wheel as best as possible. Disconnect your battery and pump your brakes. WAIT 10-15 minutes (overkill but better safe than sorry) before attempting to pull of the airbag.

Step 2 - using a T30 Torx bit, break loose the two bolts holding the airbag from the wheel (the spot where you push for the horn for the dumb ). they are located on both sides.

Step 3 - carefully pull the airbag towards you. if it doesnt come out easily, you havent turned the torx bolts enough out yet.

For my 05 Sti, there was 2 things to disconnect on the back of the steering wheel:

1) the horn wire, just simply pull it off the metal tab it sits on.
2) the airbag wire. you need to pop up the yellow tab on the back (use a flathead), pull it out, and then pull up and out on the plug. set aside the airbag in a safe place.

Step 4 - unplug the cruise control harness from the roll connector. here is a photo of the roll connector, the green plug goes in the middle.


Step 5 - Get a 17mm socket wrench, and loosen up the bolt holding the wheel onto the hub. all i did was hold the wheel with one arm and loosen it with the other, it honestly isnt that tight (at least mine wasnt). loosen the nut to the end but dont remove it. your going to have to give the wheel a good tug to break it loose.

Step 6 - remove the plastic pieces around the steering column. i also removed the display surround as well for extra room.



Cruise Control

Be warned. If you are NOT comfortable soldering or modifying the circuit board on your newly acquired 08 wheel buttons, i suggest getting this done by someone else. there is little room for error and you can permanently screw up the board if you do no do this right.

Ok, so, now let me get into the hard stuff.

The 05 Cruise control harness (that plugs into the roll connector) has a green end, and has these color wires coming out of it:

green connector


Black: Cruise On/Off (pos. trigger)
Yellow/blk: Set coast (pos. trigger)
White/red: Resume accel (pos. trigger)
Yel/blk and wht/red: Cancel (pos. trigger)
Green/blk: 12v constant
Red: 12v switched

Cut the wires from the stock 05 CC. dont cut them too close to the green plug, give yourself some room to work with.

i didnt cut off the white plug on the 08 steering harness, i disconnected each pin. i suggest doing this, for i will explain later.

shot of white plug


before we get into everything let me explain the 08 harness.

Red: 12v Illumination
Black: Ground for lights
Yellow: Cruise On/Off (neg. trigger)
Brown: Ground
Green: Cancel, Set/coast, and Res/accel (neg trigger with resisters).
White: Audio signal
Blue: Audio ground


The signals for the cruise controls are different. The 08 uses 1 wire for cancel, set, and res. Where as the 05 uses 2 wires. the 08 uses ground signals and the 05 uses 12v signals.

shot of the circuit board next to the cruise buttons exterior. this is what you find when you remove the backing to the cruise control buttons. BE CAREFUL removing the back plate to get to the circuit board. i didnt snap out a peice before trying to pull it out and i ended up breaking a peice off

note: the photo below has two extra wires in it, for reference only for the backing of the circuit board. (these are wires that you have to solder in later)



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Last edited by xxscaxx; 04-04-2010 at 12:01 AM.
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Old 04-03-2010, 12:49 PM   #2
xxscaxx
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modifying the circuit board

In order to get your new 08+ steering wheel cruise buttons to work properly, you will need to do some modification to the cruise switches circuit board. There are 4 resisters that need to be removed and 2 wires that will need to be soldered to the board itself.

In the pic below you will see 4 resisters that have been outlined and circled in red. These are the 4 resisters that you need to remove from the circuit board. You can heat them up with a soldering iron and they will come right off.


Once you have the resisters removed you will now be ready to solder on the 2 extra wires that you will need. the next pic has 2 red circles that show you where you need to solder each wire. Within those circles you will notice 2 solder points. You need to make sure you strip your new wire just long enough to span both points. This will help make for a better/stronger connection.


This pic shows the 2 new wires in their proper places. The red circle with the 2 black dots represent the solder location and the 2 solder points (notice how the wire is soldered to both points).


Please take note to the way the wires are running across the circuit board in the above pic. They need to lay exactly like this to avoid interfering with the buttons once you snap everything back together. You will notice that the rubber button cover for the circuit board will have to be trimmed slightly in order to allow the new wires to exit cleanly. Once you have done this, fish the new wires through the black tubing with the other wires. You can now snap your cruise switch back together.

Diodes

here is the diagram. you have to put in diodes to separate the functions for the circuit board. this will allow the orange and white wire you just soldered in to have their own purpose in a sense. this is because the 08 only used one wire for 3 different functions.



On the Roll Connector, the spot to the left of where you plug in the green CC plug are not being used. this is where you will run wires down through the roll connector. You will need to run a wire down for the audio buttons, and if you choose a wire down for the illumination for the buttons. This is why I suggested just taking the pins out of the 08 connector in the beginning of this thread, because you can then use the pins to push them onto the prongs inside the roll connector (see photo below).

I suggest you remove the roll connector, as you have to pop open the bottom of the roll connector and solder in two wires onto the copper ribbon running through the roll connector. again, im an idiot and didnt take a pic of the ribbon. here is the picture explaining what you have to do, as well as the bottom roll shot of the roll connector.






After you have all the crazy wiring done for the cruise control, this is now the new layout to connect the 08 wheel to the 05 green plug for the CC.

08 Wires ------Green CC Plug

Yellow-----Black
Brown-----Red
Orange-----Yellow/Black
White-----white/Red



The green wire on your green CC plug, is now only used to connect to the airbag for the horn. Tape off or remove the end of the wire and only leave the connection for the tab on the airbag.

There are now two wires left over on the 08 wires. Black and Red. These are used for illuminating the buttons on the wheel. You will have to run the red wire down through the roll connector and to an illumination wire, and then ground the black wire. I connected it to the ORANGE wire on my Pioneer harness (its labeled illumination)


I grounded the black wire along with the BLUE wire for the audio buttons inside the wheel itself to one of the screws.


Last edited by xxscaxx; 04-04-2010 at 12:03 AM.
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Old 04-03-2010, 12:50 PM   #3
xxscaxx
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Audio buttons

I kind of touched home with this, but, you use two wires for the audio buttons, the BLUE and WHITE. Blue is the ground wire. As stated above, I grounded that inside the wheel itself along with the black wire for the illumination buttons.


The white wire has to be ran through the roll connector. If you removed the pins from the white connector like I said to do earlier, then ends should look as they do above, and you will be able to slide the white wire right onto the prong inside the roll connector up top. See this photo below. The yellow wire is for the illumination, as I mentioned above.

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Old 04-03-2010, 12:50 PM   #4
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Illumination wires

as again stated above, these are the black and red wires on the 08. Im just separating each section up so its easier to find.

Black – ground to wheel
Red – ran through the roll connector (yellow on top and bottom)



run a wire from the bottom of the roll connector (yellow) to the orange illumination wire (if you are using a pioneer HU). Solder in here.

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Old 04-03-2010, 12:50 PM   #5
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PAC wiring

reading through the pac instructions, you only need the two loop wires, red, black, and white.
Red – 12 v
Black – ground
White – to wire through roll connector (grey wire on bottom of roll connector)

Run the red wire from the PAC to a 12v source. I wired it into my pioneer harness.
Note: I did not leave the wire like this, everything was soldered.


ground the black somewhere.

White wire – run behind the dash and up to where the roll connector is, to the grey wire on the roll connector. Hide and place wires strategically so they do not interfere with anything.
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Old 04-03-2010, 12:51 PM   #6
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OK, head spinning yet?

BEFORE YOU SOLDER ANYTHING, check the connections first. Don’t waste your time soldering to only find out you didn’t connect something right or made a mistake.

Solder your wires together up top to the green plug and the 08 wheel.


connect the two pins to go into the roll connector. DO NOT put back the airbag yet, check your connections first!

Connect the two bottom wires from the roll connector to their corresponding wires. (yellow wire goes to the illumination wire, grey goes to the white wire on the PAC).

Reconnect the battery, and now get ready to program the PAC unit. Here are the instructions from the PAC site.

Programming the SWI-PS with a version number.

The SWI-PS has to be programmed for version # 3.

1. Press and hold the Program Button on the SWI-PS while turning on the vehicle to the accessory position. The LED will turn on.
2. Release the Program Button and the LED will turn off.
3. Press the Program Button 3 times. Each time you press and release the Program Button, the LED will turn on and off. Once you press the Program Button 3 times, wait for 3 seconds. The LED will flash 3 times indicating it is programmed for version 3. If it flashes the wrong version number, you will have to start all over at step 1 above in this section. Turn the key off.
4. Once you have programmed the correct version number, you will not have to do these steps again. If you need to reprogram the steering wheel control, you can go directly to the next section.




Programming the SWI-PS to learn steering wheel control functions.

1. Turn the key to the accessory position (you do not need to hold the Program Button at this time). The LED will flash 3 times. This indicates it is programmed for version 3.
2. Press the Program Button until the LED turns on, then release the button (This will erase all previous learned steering wheel control functions). The SWI-PS is now ready to learn a command from the steering wheel.

3. The SWI-PS must be programmed in the specific order shown in the chart below. If a function is not needed, it may be skipped.

Pioneer Programming order for SWI-PS
1 Volume Up
2 Volume Down
3 Mute
4 Track Up/ Seek Up
5 Track Down/ Seek Down
6 Source
7 Preset Up/ Disc Up
8 Preset Down/ Disc Down
9 Band


4. With the LED on, press your steering wheel button until the light goes out and hold for one second more.
5. Release and the LED should come back on. If it does not please double check all connections and verify for correct version programming.
6. Repeat step 4 and 5 to program additional steering wheel buttons in the order corresponding to the chart above for your SWI interface.
7. If you come across a command in the chart that your steering wheel does not have, or you do not want to program, press the Program Button on the side of the SWI interface.
8. The LED will flash once rapidly and then stay on confirming that you have successfully skipped that command and are ready for the next button.
9. When you are done programming all the buttons, wait for about 7 seconds. The LED will flash 3 times indicating it is done programming. The LED will then flash 3 times indicating the version number.


Check and make sure all the buttons you programmed worked, check to make sure the illumination comes on when you turn on your headlights, and lastly make sure that your cruise buttons are working. Ill warn you now…the pac unit kinda blows, but is the only option I know of right now. All my buttons work ok except the mute and the volume up…they have a mind of their own (working sometimes and then not working)
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Old 04-03-2010, 12:51 PM   #7
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Swapping charges

NOTE: I am not responsible for your actions, again do this at your own risk! I trust swapping the charge than wiring into the airbag system. I only swapped bc my charge only had one plug in the back, and is single stage and the 08 is dual stage.
This is very simple. Unbolt the 4 10mm bolts, carefully lift out the charge, and place it into the 08 airbag.


swapped over


now if everything is good, you can reconnect the airbag. REMEMBER TO DISCONNECT THE BATTERY AGAIN AND WAIT, DON’T BLOW YOURSELF UP

reconnect everything…. Your done! Again once you get everything back together check to make sure it all works.



Last edited by xxscaxx; 04-03-2010 at 01:01 PM.
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Old 04-03-2010, 12:52 PM   #8
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edited and moved in proper spot

Last edited by xxscaxx; 04-03-2010 at 11:59 PM.
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Old 04-03-2010, 12:52 PM   #9
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reserved spot 2

Last edited by xxscaxx; 04-04-2010 at 12:01 AM.
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Old 04-03-2010, 12:53 PM   #10
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reserved spot number 3

everything should be in the right order now.

Last edited by xxscaxx; 04-04-2010 at 12:01 AM.
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Old 04-03-2010, 01:52 PM   #11
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Nice work man, that looks amazing!
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Old 04-03-2010, 01:53 PM   #12
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The ability to find DIY threads on almost ANYTHING you could dream of doing to your car.
It's what makes a subaru a subaru


Very nice writeup and REALLY cool idea. Good job
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Old 04-03-2010, 01:57 PM   #13
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nice diy
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Old 04-03-2010, 02:07 PM   #14
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Great write up but looks out of place in the dated GD cockpit.
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Old 04-03-2010, 02:26 PM   #15
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Very cool, bookmarked for when I eventually put in an aftermarket radio and want those handy wheel controls
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Old 04-03-2010, 03:34 PM   #16
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Quote:
Originally Posted by MF-DIF View Post
Great write up but looks out of place in the dated GD cockpit.
lol, no actually it doesnt at all. it fits in quite good actually. i dont have a good camera. check out nellys interior of his saab... he has an sti interior. it looks...perfect.


thanks everyone else, make sure to give props to Dave as well lol.
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Old 04-03-2010, 04:06 PM   #17
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props Dave! haha awesome DIY writeup
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Old 04-03-2010, 04:14 PM   #18
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Bask in the glory while you can man! You are part of a rare breed..........for now anyways!

Nice work! I'm glad I was able to help you make it happen! Maybe someday, I'll be apart of this rare breed again too! Hope you have a good alarm!

-Dave
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Old 04-03-2010, 04:56 PM   #19
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hahaha yes for now... i dont know how many people have the balls to go into that circuit board so maybe they will bitch out

thanks again man, i cant thank you enough.

oh, and lowjack ftw (hopefully lol)
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Old 04-03-2010, 05:26 PM   #20
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i got balls to go in the circuit board

super awsome DIY it looks fantastic!

mad props to you sir
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Old 04-03-2010, 06:28 PM   #21
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If anyone is scared to tackle the board modification, I can do the modifications for you and even make it "plug in" with out having to modify your stock green cruise plug. There would be a small fee of course.
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Old 04-03-2010, 06:45 PM   #22
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Dave is terrible at doing circuit board modifications...ask me how i know

just messin
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Old 04-03-2010, 07:16 PM   #23
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Last edited by Nelly; 04-03-2010 at 07:24 PM.
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Old 04-03-2010, 07:29 PM   #24
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Haha!


<------------
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Old 04-03-2010, 07:30 PM   #25
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Oops! Double post!

Last edited by Nelly; 04-03-2010 at 08:29 PM.
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