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I bought this truck a week ago and it had an aftermarket stereo in it. They said they wired it to be constantly on because it wouldn't work otherwise. I replaced it with the stereo I had and wired it up correctly but it only comes on when the key is in the accessory position. When you start the truck it goes back off. Any ideas? Thanks!


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I bought this truck a week ago and it had an aftermarket stereo in it. They said they wired it to be constantly on because it wouldn't work otherwise. I replaced it with the stereo I had and wired it up correctly but it only comes on when the key is in the accessory position. When you start the truck it goes back off. Any ideas? Thanks!


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What stereo did you install? Do you mean you had another aftermarket HU of your own? I don't actually care about brand, etc. Just curious if you swapped out one aftermarket for another - or if you had the factory unit for it.

Please give your description of "correctly". Our trucks kinda require an unusual installation (likely why the previous owner wired it the way they did).
 

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What stereo did you install? Do you mean you had another aftermarket HU of your own? I don't actually care about brand, etc. Just curious if you swapped out one aftermarket for another - or if you had the factory unit for it.

Please give your description of "correctly". Our trucks kinda require an unusual installation (likely why the previous owner wired it the way they did).

I put a Jensen in, it already had an aftermarket Pioneer in it.

I simply attached the plug they had from there's and instead of setting it up to be hot all the time. I set it to get hot with the key.


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There is a special harness that is usually required. There are ways around it, but it's not too simple. There is not a switched ignition feed for the stereo I think....that's why it is only working on ACC.

I'm going to assume the harness is simple and does not include all of the necessary connections.
The 2 preferred chimes retention modules are GMOS and GMRC units.

You can search the site for something like "How to retain RAP". It will describe how to wire your stereo to the battery so that the radio stays on until the doors open. Otherwise, you have limited functions of how it works. Unfortunately it's the GM design....believe it or not the Stereo is actually a hub for the BUS system.
 

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Discussion Starter #5
There is a special harness that is usually required. There are ways around it, but it's not too simple. There is not a switched ignition feed for the stereo I think....that's why it is only working on ACC.

I'm going to assume the harness is simple and does not include all of the necessary connections.
The 2 preferred chimes retention modules are GMOS and GMRC units.

You can search the site for something like "How to retain RAP". It will describe how to wire your stereo to the battery so that the radio stays on until the doors open. Otherwise, you have limited functions of how it works. Unfortunately it's the GM design....believe it or not the Stereo is actually a hub for the BUS system.

Ah okay so I need to buy an adapter kit. That makes sense. Good ole' GM haha. Thanks buddy!


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I'd like to believe that will correct the problem you're experiencing.
They are like $80 retail but you can get them around $40 online I think.

Don't go to WalMart and buy the one by Scosche, you may end up with additional problems. For some reason the Scosche stereo harness doesn't play nicely with our trucks.
 

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^^^ or another way to do it is like I did. I didn't care about the chime so I ran my own wiring. most use 2 hot wires one hot all the time and one ignition fused(meaning it is only hot when the key is on). I got that power from the onstar fuse position in the fuse box since I don't have onstar. The third wire is the ground wire.
 

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They did purchase an aftermarket stereo hook up after all. It was a black Scosche box. My buddy used to have a colorado and gave me the adapter he had instead, it's also a Scosche but it's blue I think (i'm colorblind). I just unplugged the old chime box and plugged the new one in. Works great now! Thanks guys.


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They did purchase an aftermarket stereo hook up after all. It was a black Scosche box. My buddy used to have a colorado and gave me the adapter he had instead, it's also a Scosche but it's blue I think (i'm colorblind). I just unplugged the old chime box and plugged the new one in. Works great now! Thanks guys.


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If it fails again, then go another avenue. I don't know of different Scosche chimes boxes. I only know from reading that Schosche chimes for this truck are not the best suited. I do not know if one model works better than another.

At least it is working now, and you were able to narrow it down to the chimes control.
 
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