Thanks for all your responses. Rainman, I want to keep the existing unit's adapter plugs & loom to go with the removed Pioneer as it's a good one. I've ordered a new one from Repco. Should be ready tomorrow. I'm OK with identifying the existing wiring as per my posted diagram and as Dave kindly explained. My problem was the matching the wires from the new unit and the power for the reversing camera as it has sat nav & video capability. I think I have it sussed now. Just connected the Accessory & battery & Power to the +ve on a test battery & viola, the screen pops out. The reversing camera +ve should connect to the reversing light hot wire, the wire marked brake to the handbrake circuit (so the video won't play unless handbrake on), and the reverse wire also to the reversing lights hot wire. As already stated, the speakers are no problem.
Will post how this goes.
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