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do you know the trim line on your 4 runner?
it does not show as an available option for that trim line meaning it can not be added without replacing harness and so forth which you would be in the 5+ thousand dollars.
that is how you know. i am a former toyota service tech at two different dealers. if it does not show it as an available option it means it is not pre wired for it. vehicle trim lines are only pre wired for the available accessories of that trim line.
you can install the light sensor but it will not work with the rest of the system somethings have the prewiring for it and others do not.