How to fold down the rear seats of a Buick GL8?

[MacCorbin]

Check under the headrests on both sides of the rear seats to see if there is a switch, one on the left and one on the right. When pulling the switch, you need to first press out the backrest and then pull out the switch. If it is a foldable backrest, open the rear trunk and pull the black strap under the seat backward, then lift the seat upward.