Reverse camera LEDs turn on but camera won't come onto the screen

[Salim]

if you do need a reverse signal for the head unit these is a yellow wire in the left hand kick panel that i used to trigger the head unit.
im sure is was a solid yellow wire just use a test light and prob which wire lights up with reverse there should be one in the left hand kick panel
i have a 2008 wagon right hand drive. yours may be different

Thanks for this mate sorry but what do you mean by kick panel? Yep same car as yours.