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Removal Procedure

Remove the rear shelf trim panel. Refer to TRIM PANEL REPLACEMENT - REAR WINDOW SHELF in Interior Trim.
Remove the child seat tether bracket to rear shelf bolts.
Turn the child seat tether brackets 90 degrees.
Lift the child seat tether brackets to remove from the rear shelf.

Fig 1: Removing Child Seat Tether Bracket To Rear Shelf Bolts
Courtesy of GENERAL MOTORS CORP.