Can anyone help?

[Moy]

I have a Mk 1 parrot asteroid head unit and I'm stuck on wiring a sub up to it, I've got everything done (or at least I think I have) but my problem is the remote wire.
I can't seem to see any blue wire on the head unit anywhere and scoured online but can't find any useful info on where or what to do with it.
I have power getting to it but it won't switch off when I shut the car down and not getting any sound through either.
Please could someone help me put an end to my insanity!

[Scottp]

Assuming the rest of the wiring to the amp is correct then all you need is a switched live to activate the remote wire when the ignition is active. Assuming its an ISO loom to the head unit (not familair with yours) then there will be a red and a yellow power wire. One being permanent (so you dont loose your presets) the other being switched that activates with ignition to actually power the unit on. You need the second one for your remote wire. Cheap multimeter or bulb power tester will confirm which or wire to one and see if the amp is still active after you take to keys out, if it is you need the other one.