That's normal. With any video camera, noise will come in to play when it boosts the gain so you can see an image when there isn't vey much light.
The only way you can fix that is to increase the light level illuminating the camera's POV at night.[/
Makes sense. Question though. I put brighter bulbs in he reverse lights. Graininess got worse at night on the screen. Shouldn't it get clearer then?
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Good point. It's likely that the camera switches to a lowlight mode when you turn the headlights on. It probably turns up the gain so the increase in light is just adding noise and blowing out the image.
In short, it sounds like the camera has two modes - night and day. Rather than auto iris which would close the iris the more light that hits it. If that's the case, there's really nothing you can do to overcome night mode.