Chevrolet Equinox Fuel Cell Owner's Manual page 15

Prior to lowering the seatback, ensure that both of the
seatbelts are unbuckled and the front seats are not
reclined.
CAUTION:
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If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
push and pull on the seatback to be sure it is
locked.
Lift the lever on the upper back corner of the seatback to
move it to the desired position and then release it. Push
and pull on the seatback to be sure it is locked in place.
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