cstilley

How can you update the backup camera in a 2005 LX470, or does it have to be replaced

CloudCity

If you mean you want to update the quality of image that's a two fold issue, the camera has resolution limitations and the screen has pixel limitations so replacing one or the other won't help. You could buy a totally separate aftermarket solution that mounts the screen over, or replaces, your review mirror if you need better resolution.