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Your second picture is how it is done without going through the head unit. so you're on track there.
You can add a usb device if you want an easily accesed volume control. Some people make thier own rotary encoders, but I just bought a griffin power mate and plugged it in. as a side bonus, it can be programmed for many other functions.
Can't give you any advice on how to perorm your install in the celica's dash though. You'll need someone who has done it before or make it up as you go.
Good luck
BJ
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For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
Leonardo Da Vinci
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