remove the panel on the drivers side of the radio the plugs are on the side, not on the back so you don't need to remove the unit.
the plug that has the reverse cam inputs is this one
if there is a plug in that when you remove the panel then there should be a plug at the back of the car that has the wires for the camera.
I don't know about the utes but in the sedans its the same plug the number plate light plugs into.
if you follow the wire from the number plate light you will find like a 6 pin plug.
in the sedan the pink is the video feed and green is the reverse switched 12v power
if there is no plug in the side of the radio you will need to make one up or buy a reverse cam kit that has that plug.
and you will also need someone to program the iq unit to use/allow the reverse cam input.
www.carmodder.com • View topic - Fitting a Reverse Camera to a VE Commodore
Holden VE Radio Upgrades and Kits - Envyous Customs