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There is a red lense and a square pushbutton with a metal bar that separates the two in that long vertical rectangular area that is left of the instruments.
The later style instrument bezel uses a red lense without a bar separation, so the lense itself is the full length of the long vertical rectangular area, no manual pushbutton, since the seats now have a built in sensor and a buzzer that lights and sounds when someone is sitting in the seat without lapbelt on and ignition is turned on or car is running.