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Don’t cut anything yet. I had the same problem. What you have to do is go get a harness that has cpu stuff on it. Because trailblazers made there radios with cpu components in it that help your car function right. So you have to go buy this cpu thing to plug into that factory harness you have in the picture . And then you wire your cpu that plugged into that into your factory harness to your radio harness that came with the radio. I sodered the wires but you can crimp or just tape it. That’s up to you. The thing I bout was about 100 bucks at my nearest Best Buy and my radio has been working for the last 6 months I’ve had it in. And if there are 3 black wires put them all together. And make sure you color match them right.So I'm trying to hook up a new stereo in my 2009 trailblazer and none of the colors match there's no yellow red and I don't see a black I can't find the harness for it so I have to do it wire to wire can som one help me please I'm dying over here View attachment 56814
I think that the steering wheel control is if you have a fancier trailblazer with the radio controls on your steering wheel. I am not 100% sure about that. But that would make the most sense.View attachment 56817
so this one right here is the exact one I have. When I said function I lied a bit. I just figured out what this thing does. It is mostly for the onstar system in you car so that keeps working. It also says something about the steering wheel control. I have no idea on how that effects the steering on your car. You have the same year trailblazer as me but I am not sure if you have onstar or not. I don’t really know the effects if you were to just splice into it. Your car will still obviously drive but I don’t know how it’s going to effect the stereo system you have in your car. I am also not very sure if you can buy one without the onstar system. That’s if you don’t really care about onstar. I personally don’t. I just listened to the best but guy that helped me out. He spealized in the audio section so I trust him. I also didn’t want to mess with the factory harness in case I ever wanted to go back to the old radio as well. If I were you I would just stay on the safe side and get it maybe. I have seen these things cheaper. You don’t have to get this specific one but it is the one that works for me. Also if you decide to do this and get this thing. I had a problem where I had all the wires and everything right but there is a ton of harnesses and it can get confusing. I put one of the harnesses in the wrong spot. I couldn’t figure it out for a few days. I looked at the directions and it said all the harnesses were right. Everything was matching according to the picture. But this one harness could be plugged into multiple spots. I plugged it into the amplified instead of non-amplified since I still had the factory speakers. So just be careful if you do decide to get it. Make sure you read the directions on how to install it.
The solid orange wire from the TB is your 12V constant. You can hook both the red and yellow to it. You have to remember to turn off the radio, since it is a constant ON. Other constant on 12v is the cigarette lighter. I had put a tap and wire with a plug terminal on that and I plugged my accessory wire ( red) into that and my clock was constantly visible when the unit was off. Otherwise you have to either go into the ignition wiring ( I don’t advise, leave that to experts)So I'm trying to hook up a new stereo in my 2009 trailblazer and none of the colors match there's no yellow red and I don't see a black I can't find the harness for it so I have to do it wire to wire can som one help me please I'm dying over here View attachment 56814