If monty's explanation doesn't work out, why don't you pull out the drivers seat (which I assume has a working tilt function) and compare both seat electrical connections? Its probably easier to do that than second guess what some previous owner has done or not done to the passenger seat wiring.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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