1999 Buick Regal Owner's Manual - Page 111

yellowblue Rear Seat Pass-Through (If Equipped) To access the cupholders, press on the top of the cupholder door, located just behind the console shift lever. Two cupholders will pop into an upright position. If your vehicle has this feature, you may access your trunk by pulling down the center back seat cushion -- this gives you access to the pass-through door. The door can only be unlocked using your door key. Once this door is unlocked, you will then have access to the trunk area. To access the rear cupholders, once again, pull down on the strap located toward the top of your center back seat cushion. You will then have access to the dual oversized cupholders. 2-51