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Originally Posted by Keethos
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?
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If your TAS300 behaves like the BRZ FT nav, your HU will need to see the camera video signal already present when the HU boots. That means your camera will need a source of 12V that turns on when you turn your key to ACC or ON/RUN. This is "+12V Accessory". That is used to turn the radio on/off. It's often used for accessory outlets ("cigarette lighter" outlets). There are usually several circuits (buses) going to various modules and devices throughout the car. You'll need to check your model's wiring diagrams to find good locations to tap (ideally near the camera).
On the other hand, if the TAS300 doesn't care about the camera video signal until you actually shift into reverse, then you can power your camera from the reverse lights (tap into that wire, near the camera).
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Please check out the pics below that I've just taken for more info, these are hidden menu's
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when I do engage reverse ... "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?
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Thanks. That confirms you have the reverse signal at the 28-pin plug at the HU. That means we won't have to add that signal to your harness.
That doesn't tell us whether the reverse signal is on the native 28-pin harness or if it's merged in via the nav [
correction: "Standard Touch Head Unit"] adapter harnesses. The main reason to check that is so we'll know for people who have your same model car but don't have the [same HU as] yours.
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Originally Posted by Keethos (via PM)
how I can power the camera during an initial test (i.e. just hooking up the camera to the head unit without installing anything, what's the easiest way of powering it momentarily)
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Probably the easiest would be to get a 'cigarette-lighter-plug-to-plain-wires' type adapter and a pair of alligator clip leads. Use those to clip onto the camera's power leads.
It's definitely a smart idea to test a camera (especially no-name ones from Asia), because more than a few people have had problems. First, test on a regular TV or monitor that has a composite video input, then on your HU's rear camera input. You want to discover any problems while it's still easy to return (and definitely before you've drilled holes, cut wires, glued, etc.).