Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

Courtesy of GENERAL MOTORS COMPANY

Rear Seat Cushion (1) - Remove - Rear Seat Cushion Removal and Installation
Courtesy of GENERAL MOTORS COMPANY

NOTE:
Left side shown, right side similar.

Fold the rear seat back to the downward position.
Access the rear seat back bolster retainer lock (1) through a slot in the upper portion of the bolster.
Slide the rear seat back bolster retainer lock (1) toward the front of the vehicle.
Courtesy of GENERAL MOTORS COMPANY

Rear Seat Back Bolster Nut (1) - Remove
Squeeze the rear seat back bolster retainer to release it.
Rear Seat Back Bolster (2) - Remove
Courtesy of GENERAL MOTORS COMPANY

Using an appropriate tool, pry inwards on the rear seat back hinge bushing to release tension on the rear seat back cushion outer pivot bolt spring.
Pull up on the outer side of the rear seat back cushion (1) and remove from the bracket and hinge.