[greencounty]

Hyper, the Camera/stock headunit on the BRZ/FRS doesn't really work that way. The headunit powers the camera from the 16-pin connector on the back. It won't work to simply power the backup camera from the reverse lights because the headunit does a check upon power-up to test for a connected camera. In the configuration you describe, the camera will not be on for that check.

Also, just powering the camera will not display the image on the screen. The headunit must be tricked into thinking that the car is in reverse. This signal is pin 13 on the 28-pin connector discussed above.