Hey there you might need one of these. Shark Fin Antenna Adapter, SFA12F or Shark Fin Antenna Adapter, SFA12M
one is a male connector and the other is female, that is the best I am able to come up with, as im not 100% sure what your stock sirius connector looks like and what the back of your aftermarket stereo looks like.
This video here might also be of some help.
They use different cables in the video but the ones above should do the same thing.
If all else fails you may have to go this route.

Good luck with the install. hope this helped a bit

 

This is the back of my unit. The input for XM is the round 9-pin plug on the lower left. I tried to find the tuner in my trunk but it isn't there. It's weird because I did have XM activated on that car. Did the JBL deck have the tuner built in?

 

It sounds to me there is no external tuner for the satellite radio.

You may need to add an external tuner for the xm.

 

I'm not very familiar with the jbl unit but I think it was built in? Judging by the pictures of stock jbl units I found for sale online.
I think your best bet is going to be to buy the Sirius sxv300 adapter.

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Ok, I thought that might be the case. I was going for a cheaper solution after dropping almost $400 on the new deck install. Thank you for your help Synthanasia.

 

I totally get that. Sorry there isn't a cheaper option.
Shop around a bit on that part though. You might come up with some good deals.
Good luck and you're very welcome.

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synthanasia - another option for you...

SiriusXM Commander Touch - 09 Corolla XRS

Hi all - Just thought I'd post a few pics of the install I just did. My favorite local radio station shut down, and there is nothing good left on the air. I decided it was time for satellite - but when I looked into the parts needed to make SAT work through my stock radio, it was going to...

www.toyotanation.com

It was going to cost a good chunk of $ to get the oem satellite tuner in my 09 xrs, and same for the shark fin antenna cable. i came up with a clean install as above, and only had to pay for a one year subscription fee to siriusxm and the commander unit was free. i recognize its not exactly what you are trying to do, but cost-wise its a winner!

 

synthanasia - another option for you...

SiriusXM Commander Touch - 09 Corolla XRS

Hi all - Just thought I'd post a few pics of the install I just did. My favorite local radio station shut down, and there is nothing good left on the air. I decided it was time for satellite - but when I looked into the parts needed to make SAT work through my stock radio, it was going to...

www.toyotanation.com

It was going to cost a good chunk of $ to get the oem satellite tuner in my 09 xrs, and same for the shark fin antenna cable. i came up with a clean install as above, and only had to pay for a one year subscription fee to siriusxm and the commander unit was free. i recognize its not exactly what you are trying to do, but cost-wise its a winner!

Hey its Apricity who was requesting the Info but thanks!

They want to have the Sirius intrigrated onto their new stereo setup.


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I'm just going to go with the SXV300 from Best Buy and get the $70 gift card from Sirius. So they'll be paying me for installing it