Oldsmobile 1999 Silhouette - Manual (Page 24)

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You can also lift the lever on the side of the seat to
release the rear latches from the floor pins.
Do not let go of the straps or lever until the seat is
folded all the way forward.
4. To unlatch the front latches, with the seat folded
forward, squeeze the angled latch release bar toward
the straight crossbar.
5. Remove the seat by rocking it slightly toward the
rear of the vehicle and then pulling it out. This
should be done in one motion.