Corona '98 Wiring

[Coyote!]

;) Hi everybody, this is my first post, I hope anyone can help me.

I own a 98' Corona D-Turbo, you may know it as a Carina.

I am in the middle of the rear fog lights instalation as well as Big loud Speakers behind the rear sits ( Hidden). So Does anybody Know if Rear Spkrs are wired to the trank too? Actually is is wired to the doors where normal ones are installed.

Thanks in advance

Cheers

Andres From Buenos Aires Argentina ;)