My Boxster did not ding with lights on until I re-flashed the cluster to add the OBC functions. It now behaves differently in a couple ways: more chimes and keeping the LCD displays illuminated for a few minutes after shutting off the car.
Dealer might be able to turn the chime on/off for you.
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'01 Boxster S, 51k miles
'05 Mazda 6 Grand Touring Wagon
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