Chevrolet 2007 Equinox Owner's Manual page 12

Passenger Seat with Folding Seatback
Option shown
To adjust the seatback on the front passenger's
seat, lift the lever on the outboard side of the seat
and move the seatback to the desired position.
Then release the lever to lock the seatback
in place. If your front passenger's seat is a flat
folding seat, you must fully raise the lever to
disengage the seatback.
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