It’s definitely software, but it also requires input from the steering angle sensor. I don’t know if that is always present (it might be use for other features), or is installed in a higher package.Belive it's just software. If my base model Mazda has these features the BD should lol. I was thinking of just installing one of those rear view mirrors that have the rear cam on all the time to have a better view of what is behind me and those have the grid lines
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