Hello everyone!

I'm new in the forum, and I'm from Mexico. I searched for a thread that would resolve my problem without luck
I just bought a Crossfire '04 last week and it came with a head unit JVC; it sounds really good!

So, my problem here is that the subs behind the seats doesn't emit any sound. I removed the plates just to be sure that the subs are there and they are already connected with the factory jack to the amplifier.
After that I removed the JVC to connect those subs to the rear output of the stereo but there aren't any rear cables, the factory Jack that is supposed to have the cables that goes to the amplifier rear inputs don't have them.

I would like to know how to connect the rear outputs from my jvc to the amplifier :c

Thanks to any help!