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<blockquote data-quote="Lasherž" data-source="post: 8710725" data-attributes="member: 679555"><p>1. So from looking at that pinout it looks to me like the black wire on a Subaru needs to run to the harness maybe for some sort of sensing or fusing, but on other cars it's acceptable to just run it to the vehicle chassis. Use a terminal loop or alternatively you can add the pin and run it through the harness. There's not really a disadvantage to either way. A lot of radios have two ground points, one that goes to the harness (the car's official ground near the fuse box probably) and a terminal to hook directly to the radio cage which is well connected to the chassis. In general I think having 2 is good, but adding a pin in this case isn't necessary if it's just a ground point, just make sure you sand the location around the bolt you use to get a good connection.</p><p></p><p>2. Reverse signal may not be offered on the car since it doesn't have a reverse camera. It's there because the head unit supports one. When 12v is applied to that wire the camera will take over the screen of the device until the 12v signal is discontinued. There are alternative ways to accomplish this while wiring up a camera, so for now just leave it tied off.</p><p></p><p>3. The speed control wire if you're talking about where to connect the head unit's wire it'll be with light green, pin 18. If you're saying the head unit doesn't have a corresponding use for it that's most likely because while your stock radio had volume adjust with speed, the aftermarket unit doesn't. I personally find that to be an annoying feature to enable anyways, but theoretically it can save your volume knob some use. If your head unit doesn't support it then just tie it off.</p></blockquote><p></p>
[QUOTE="Lasherž, post: 8710725, member: 679555"] 1. So from looking at that pinout it looks to me like the black wire on a Subaru needs to run to the harness maybe for some sort of sensing or fusing, but on other cars it's acceptable to just run it to the vehicle chassis. Use a terminal loop or alternatively you can add the pin and run it through the harness. There's not really a disadvantage to either way. A lot of radios have two ground points, one that goes to the harness (the car's official ground near the fuse box probably) and a terminal to hook directly to the radio cage which is well connected to the chassis. In general I think having 2 is good, but adding a pin in this case isn't necessary if it's just a ground point, just make sure you sand the location around the bolt you use to get a good connection. 2. Reverse signal may not be offered on the car since it doesn't have a reverse camera. It's there because the head unit supports one. When 12v is applied to that wire the camera will take over the screen of the device until the 12v signal is discontinued. There are alternative ways to accomplish this while wiring up a camera, so for now just leave it tied off. 3. The speed control wire if you're talking about where to connect the head unit's wire it'll be with light green, pin 18. If you're saying the head unit doesn't have a corresponding use for it that's most likely because while your stock radio had volume adjust with speed, the aftermarket unit doesn't. I personally find that to be an annoying feature to enable anyways, but theoretically it can save your volume knob some use. If your head unit doesn't support it then just tie it off. [/QUOTE]
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