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Need Help Connecting Steering Wheel Controls to PC

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  • Need Help Connecting Steering Wheel Controls to PC

    So I am looking for advice on how to connect my 07 NBS Silverado's stock steering wheel controls to my car pc.

    Here is a picture of the wiring diagram for the steering wheel control.

    Click image for larger version

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    I'm not experienced at reading these diagrams so I'm not sure if I need to pull any other pages to get more info. Basically what I gathered here is that the steering wheel control has an input from the BCM and an output back to it. Does this mean I should be looking at the wire out from the BCM to the old head unit harness instead?

    What is the best way to proceed?

    Will a joycon controller work? Fusion Brain?
    Where to start!

    More info on my current setup:
    • Windows 8 PC
    • 250W M4-ATX PSU
    • PCIe audio card connected to 2 10" subs and factory door speakers/tweeters through a wiring harness.
    • Current input devices:
    • wireless mini keyboard
    • touchscreen
    • griffin powermate
    Last edited by mrwesth; 10-29-2013, 07:34 AM.

  • #2
    I used the Metra harness for my Camaro, which gives a 2 wire connector output that I connected to the Joycon channel A.

    Then I had to try all the different radio types on the Metra box, out of 1 through 11 mine was type 4 to make the resistivity span the joycon slider. It needs to register enough resistance change between all the button presses that they do not overlap each other on the slider, so there is a little trial and error when choosing a radio type on the Metra box.

    -Robert

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    • #3
      That sounds like a lot less work then I was expecting.

      However I may need to get a different wiring harness because I am currently using the old meta model because it has low level speaker inputs for rca cables direct from the sound card (my understanding is the new ones only have high level inputs but perhaps I'm mistaken?).

      1. Can you tell me which model metra harness you are using? Just the ASWC-1?
      2. And which joycon? I'm assuming the EX/EXR should be fine?
      Last edited by mrwesth; 10-29-2013, 10:00 AM.

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      • #4
        Yes the ASWC-1 and Joycon EXR unless you need OnStar retention too.

        -Robert

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        • #5
          Got the ASWC-1 and Joycon EXR in the mail a couple days ago. Installed them last night. For a quick fix I tried going straight to radio type 4 since it worked for you and I assume all joycon's would work with the same radio output type from the aswc-1.

          No such luck for it to just work--4 buttons don't register at all and the other 3 all read as the same keypress.Was hoping I could get this going on battery power but probably going to have to pull the truck outside and do this in the cold. :/

          Also did you turn the resistivity adjustment on the joycon at all? I've tried it at center and all the way clockwise/counterclockwise without much luck.

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          • #6
            I used a PAC-SWIX device. It wired to my factory steeringwheel contols. It uses and IR Out blaster. I grabbed a cheap USB IR Receiver and Girder for software. Worked great. That was 5 years ago, so im assuming some direct wired solutions have come out?

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            • #7
              You will have to do the joycon search the hard way if not detected type 4. You need to see the led while you go through the list, and set the joycon pot in the middle. On my first Camaro it was detected as a type 7 for what thats worth.

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              • #8
                Originally posted by rray View Post
                You will have to do the joycon search the hard way if not detected type 4. You need to see the led while you go through the list, and set the joycon pot in the middle. On my first Camaro it was detected as a type 7 for what thats worth.
                I'll give that a go next chance I have to goof around in the truck. Hopefully monday!

                It's interesting that radio type to work with the joycon would be different. Seems like there must be different versions of the ASWC or joycon causing the discrepancy.

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                • #9
                  I flashed mine to the newest version of Metra firmware, and it ruined my box. What happens now is the new firmware is supposed to support more radio types, but it also supports long press of buttons, and that ruins volume control unless you press hundreds of fast pulses for volume up/down. If you hold the button an Attosecond too long, it changes the button map to a resistance that turns the volume up to full blast, and then you have to press the down volume real fast in 1% volume increments being careful not to hold it down too long or it long press remap to volume full blast again!

                  The worst part is you cannot reflash downrev as their flasher dont support save old firmware or restore. Dont flash! Now I dont have steering wheel support until I buy an oldrev box.

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                  • #10
                    Originally posted by rray View Post
                    I flashed mine to the newest version of Metra firmware, and it ruined my box. What happens now is the new firmware is supposed to support more radio types, but it also supports long press of buttons, and that ruins volume control unless you press hundreds of fast pulses for volume up/down. If you hold the button an Attosecond too long, it changes the button map to a resistance that turns the volume up to full blast, and then you have to press the down volume real fast in 1% volume increments being careful not to hold it down too long or it long press remap to volume full blast again!

                    The worst part is you cannot reflash downrev as their flasher dont support save old firmware or restore. Dont flash! Now I dont have steering wheel support until I buy an oldrev box.
                    Interesting. I wonder if that's my problem.
                    You can remap all the buttons except volume up/down can't be skipped
                    But the other buttons are functional? So in theory there are still 4-5 usable buttons or do all of them have the same fast pulse?

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                    • #11
                      I got my JoyconEXR running again yesterday. I used the type 6 radio on my Metra box. Mine says GMOS-100 under the camaro sticker. It still freaks out if I hold the buttons too long though.

                      -Robert

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                      • #12
                        Sounds like you might have saved me some troubleshooting.

                        Any idea when the update was released that makes the box freak out? Or a good source to buy an old version of the box? I'm thinking if there was no physical redesign then just leave the wiring and swap the box out. Then I could just resell this one on ebay (assuming I have the same issue as you).

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                        • #13
                          I think that the version you want is anything before May 2013. I don't know how to tell what you get though. I have the unlucky Camaro box, which means I have to buy the whole $300 kit just to get the black box. I contacted both Metra and Axxess, and they both gave me the "Life is hard, Son... Life is Hard" buisness when I asked just for a replacement box.

                          I will buy a $400 Scosche kit before I buy another Metra kit again, that's how much I hate Metra and Axxess as a company!

                          Alternately, I might just decide to tap into the wire coming out of my steering wheel and run directly into the Joycon.

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