Pontiac 2002 Firebird - Manual (Page 136)

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4. Push and hold the up
arrow on the top part
of the convertible
TOP switch.
5. Pull down on the latches and align the top so the pins
are aligned with the holes in the windshield header.
Push forward on the larger part of the latch until it
clicks. Do not force the latch. If it is hard to lock,
the top is not properly aligned.