It's prety much the same with all car's, there is a rubber gromit in the engine bay about the size of an orange in the engine bay follow some of the other cables in the bay and they should lead you to it!

you think thats bad when me and a mate tried to fit his head unit in his probe we didn't realise the thing had a built in amp fitted in 1 of the back quarters we wer both sat there for ages.