Its not a weight sensor - its a new technology that utilizes an electrical capacitance based sensor. It uses electrical capacitance to measure the body mass of an individual sitting there. Hence electronic devices that transmit like cell phones may give false readings. By the same token however, a 200 pound lump of platic would probably not turn the light on.
If you make your passenger piss them selves - it will actually set a DTC. (Seriously - it has a code that sets for the passenger seat cushion being wet)
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