VY stock head unit not working

[JacksHSV]

Hey guys. I've had a look everywhere and can't find the answer.
Just took my aftermarket head unit from my VY clubby. I'm now trying to put the stock 6 stacker back in. And when it's all hooked up it lights up and shows the time but won't do anything else.
The fuses are all good, so I don't know what the issue is. Can anyone help?

 

[JacksHSV]

Edited post so it makes sense now -_-

 

[cheekycowboy]

dont they have a security code on em?

 

[JacksHSV]

Yea and I've tried typing it in but nothing happens. And as far as I can tell from the book it would ask me to enter it anyway and it doesn't. :/