You can get a parking sensor interface for most models so that when you replace the HU you can continue to use the sensors. On the original BLP there was no support for parking sensors as I presume they assumed you would fit a reversing camera. I've never checked to see if there is an interface for the C30/V50 parking sensors, Volvotech might be the place to look.
It looks like BluePower have made the same assumption with the Android BLP and reversing, that you will fit a camera.
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