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2012 Sierra with Onstar how to add xm/Sirius???

Sierra138

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Sierra138 New Member

Sierra138

Posted
Posted

I have a 2012 Sierra that I want to put sirius/xm radio in. It has OnStar so from what I've read it has the XM Attenna as well. The radio also has the cat/band buttons.

For earlier models (2007-2011) I've read that you can just add GM part 20940402 If you have the right RPO codes which I do.

Companies that sell the part are saying it won't work with a 2012.

"iSimple" makes a kit that adds into the back of the deck, to a sirius reciever but you still have to run an antenna from it. Some companies say it will work on a 2012 some say it wont.

 

Is there anyway to make this work with what I have so I don't have to run wires everywhere or use the AUX with a reg tuner?

Has anyone done this?

 

Thanks,

Chevyboxer Enthusiast

Chevyboxer

Posted
Posted

Unless this is just too early and I am reading this wrong you don't need anything. Simply change the band to XM and get your radio ID. Go to the XM website and fill in the info. If there is a black plastic thing over your drivers side ontop of the cab then you already have an XM receiver.

Ranger Senior Enthusiast

Ranger

Posted
Posted

Unless this is just too early and I am reading this wrong you don't need anything. Simply change the band to XM and get your radio ID. Go to the XM website and fill in the info. If there is a black plastic thing over your drivers side ontop of the cab then you already have an XM receiver.

 

 

Some trucks don't come with XM from the factory. My 07 didn't.

 

I was watching the OGM install vid and you can put an antenna under the dash where the defrost vents are, pretty nice setup and clean.

  • 6 months later...
tanked_darren Senior Enthusiast

tanked_darren

Posted
Posted

Screw the factory set up I got the dock and play I got a home stereo and docks in my car truck and boat. It's clean you can't see wires unless you look behind the thing and I run it through fm tuner. Sounds good. 1 unit 4 locations I can use it. Win.

 

The stereo shop hung it off the heater vent and used a aux wire and it looked tacky as heck. I relocated it to the window and routed the wires under the dash through the window and dash.

 

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Sent from my Nokia 5190 using Tapatalk 2

 

 

  • 2 weeks later...
indy245 New Member

indy245

Posted
Posted

As per my post I cannot change the band to XM, it is FM/AM only. When I press the CAT button it says for XM application only. Yes I do have an antenna on the top for my on-star. I thougt this was standard equipment on 2008s? Any ideas on how to get XM? I talked to the dealer and they need me to bring it in as they are at a loss as well, they don't think it came with it. I don't like the look of an external mount so I may buy a new drop in stereo if this doesn't work.

tanked_darren Senior Enthusiast

tanked_darren

Posted
Posted
As per my post I cannot change the band to XM, it is FM/AM only. When I press the CAT button it says for XM application only. Yes I do have an antenna on the top for my on-star. I thougt this was standard equipment on 2008s? Any ideas on how to get XM? I talked to the dealer and they need me to bring it in as they are at a loss as well, they don't think it came with it. I don't like the look of an external mount so I may buy a new drop in stereo if this doesn't work.

It is not standard.

 

Sent from my Nokia 5190 using Tapatalk 2

 

 

idahoruss Enthusiast

idahoruss

Posted
Posted

I just completed this mod on my 2012 work truck. I bought a factory XM box and short wiring harness that was taken out of another pickup. I had to modify the XM box because the XM box is tied to the original truck's VIN and will not work in another truck because of the theft lock feature. The solution is to cut 4 leads to a small chip in the box ( I can send a link if you get serious). I used an aftermarket XM antenna that had a connector that would work on the GM XM box. In my 2007 SIlverado, the Onstar antenna did not have XM. I used the GM factory kit back then and had to change out the antenna. If your new Onstar antenna has the XM antenna there should be a wire and connector tied off somewhere behind the glove box.

 

A wiring harness is required to "Y" the XM box into the radio plug. Try to find a salvage yard box and harness combo. The XM bok can be mounted behind the glove box if you can get the bracket, or just use cable ties.

 

The only "bug" I have found is that when I turn off the truck, the XM radio usually goes back to Channel 1 when I restart. I suspact this is due to the mod to get around the theft lock. I can live with this because I have my favorite channels preset on the radio. The presets do not change.

 

I spent less than $100 for the whole set up and am very happy.

  • 4 years later...
warriorpluto Enthusiast

warriorpluto

Posted
Posted

I just completed this mod on my 2012 work truck. I bought a factory XM box and short wiring harness that was taken out of another pickup. I had to modify the XM box because the XM box is tied to the original truck's VIN and will not work in another truck because of the theft lock feature. The solution is to cut 4 leads to a small chip in the box ( I can send a link if you get serious). I used an aftermarket XM antenna that had a connector that would work on the GM XM box. In my 2007 SIlverado, the Onstar antenna did not have XM. I used the GM factory kit back then and had to change out the antenna. If your new Onstar antenna has the XM antenna there should be a wire and connector tied off somewhere behind the glove box.

 

A wiring harness is required to "Y" the XM box into the radio plug. Try to find a salvage yard box and harness combo. The XM bok can be mounted behind the glove box if you can get the bracket, or just use cable ties.

 

The only "bug" I have found is that when I turn off the truck, the XM radio usually goes back to Channel 1 when I restart. I suspact this is due to the mod to get around the theft lock. I can live with this because I have my favorite channels preset on the radio. The presets do not change.

 

I spent less than $100 for the whole set up and am very happy.

Can you post which leads to cut?

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