yeah, mine also has reverse parking sensor fitted but no on/off button.
My guess would be 1. it's dealer fitted accessory so it depends on the type of parking sensor they use. or 2. on/ff button only applies to front bumper sensor, as when you place gear on reverse R it automatically switch it on so no need for a switch.
It doesnt really bother me. Love the parking sensor, especially I have to reverse out of drive way every day. Only problem is when you reverse down the slope it beeps even if there is nothing there.

			

					
					
					
					
				
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