https://jpn.pioneer/ja/support/s-manual.php?main_cd=001&sub_cd=002&model=AVIC-RW300&product_no=00009202&sort=1&bmp_type=AVIC-RW300&disp=s-model2
Check the Violet/White reverse wire connection. Go to AV Settings -> Camera Input and ensure the camera setting is toggled to "ON" or "Battery" polarity rather than "GND". Radio Frequency Limitations
Illumination (dims the screen when headlights turn on). Audio and Signal Connections Purple / Purple-Black: Rear Right Speaker (+/-) Green / Green-Black: Rear Left Speaker (+/-) Gray / Gray-Black: Front Right Speaker (+/-) White / White-Black: Front Left Speaker (+/-)
Ken’s "new" car, a sleek import from Japan, came with one major mystery: a head unit that spoke only Japanese. It was a beautiful piece of tech, but without a manual, Ken was just pushing buttons and hoping for music instead of a factory reset.