Hi mate not sure if this is what you mean.
Attachment 76919
Hi mate not sure if this is what you mean.
Attachment 76919
On the pic you posted... Plug A is the plug in question and one of the wires will be labelled Rev Cam or similar.
If you put 12 Volts on that wire it will trigger the Head Unit to display the "R-Cam" video... that is what the red wire is for that is part of the RCA lead.
Sounds like your on a good track now, the kick panel is in the left hand side of the left hand front foot well.
You’ll have the pull up the scuff trim and then pull out the kick trim, there’s a screw holding it in as well.
on a right hand drive car look in the lefts side of the passenger foot well