Back speakers dont work?!? help

[silvertze]

So I recently installed the alpine ida x100 radio in my car. Now the problem is ever since Ive installed it, i dont hear my rear speakers. Ive been doing some research and apparently the back speakers are on an amp, and I pretty much just have to wire the remote on to the amp. If that is the case, which cable is it, Ive done installs on a few other cars in the past, none of which worked on a rear amp.

FYI I have a 2004 1.8t tip fwd

[dirtybrd]

Did you use a Metra adapter.

[silvertze]

I did however the kit i used only had adapters for thee of the clips. Theres one that isnt connected however i spliced into it to make it work. Thw thing is i dont know which wire was the remote amp on for the car.