Two things come to mind: 1) moisture @ the mirror wiring connector behind the door card and 2) faulty electrical portion of the ignition switch.
My heated mirror indicator light used to come on after I washed the car - found moisture caused by a leaking plastic membrane behind the door card.
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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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