Hi David,
Thanks ever so much for such a quick response and for looking into this for me, I didn't even know that this unit was a Panasonic unit, there seems to be very little information available for this head unit, not even the TAS300 code or part number brings up much on google.
I must apologies, I forgot to mention that I had also opted for the upgraded JBL sound system which was a dealer fitted accessory (changes all 6 speakers for 9 JBL speakers, plus amp and sub that are fitting in the wheel well in the boot (see here for the installation manual for the JBL):
http://www.toyota-tech.eu/aimuploads..._002_515_1.pdf
Only a small hand full of people have opted for this upgrade so most have just stuck with the standard system or the Nav system which I assume won't have these pin adaptors.
When you say "need to power an aftermarket camera from the car's +12V Accessory bus" what exactly do you mean by this? Are you referring to the 12V plug like in the glove box? How would I go about doing this?
This is the camera I'm looking at getting (in the hopes it will easily replace one of the license plate lights)
http://www.ebay.co.uk/itm/2510965531...84.m1423.l2649
Please check out the pics below that I've just taken for more info, these are hidden menu's that can be activated by holding the "Media" button and then turning the lights on and off 3 times and the other is by holding the "Setup" button and then turning the lights on and off 3 times. While in the mode via the "Setup" button, I can advance onto a "Next page" which will indicated if the Reverse Gear is engaged, and when I do engage reverse (even with the clutch down) as you can see in the last pic, "REV" reads "ON". Does this mean that the reverse 28 pin harness does have the reverse pin connected correctly even at the native port? Will you still require me to follow the cable back to the native plug?
I'll try and get more pics to you next weekend when I'm free.
Thanks again,
Keith