Finally I found the best place to pass the wire though the firewall. There was a whole exactly behind the battery but firstly it was way up (in the car would be back of the dashboard and unreachable) and it was blocked anyways.

Just found another whole a lil bit furthur down. (saw it on my friends civic). Mine wasnt spare and there was somthing like a wire in it. But it was acually nothing but piece of plastic or like a cover for a wire. It comes straight in from the passenger side but the whole is underneath the carpet.

Just sent this for some ppl who will peobably need this help later.

Thanks