Apparantly Someone Shut the trunk Lid Too Hard And Broke the Auto Latch Assembly . They are Very easy to Break You Can Either repair it yourself Or take it to A dealer .Either way after repair you shut the lid with little or no pressure ....DONT SHUT THE LID FAST OR HARD.....
Below the decklid.
The latch should be adjustable-it's not catching.
Under the trunk
in the trunk
If it's the one where a electric motor closes the trunk for you, you might have to get the new electronic switch by the latch on the car. That's what I had to do.
look n the trunk the number is usually located on one of the trunk hinges
If you have an automatic release like I had on a 1994 Buick P.A. and it stopped working and would not close, I had to replace the latch assembly to make it a manual by getting a used one from the salvage yard. The trunk still closes today.
To fix a trunk on a 1993 Buick Riviera that is stuck open, first, check the trunk release mechanism and the latch for any visible obstructions or damage. If the latch is stuck, try using a lubricant like WD-40 to loosen it. Additionally, inspect the trunk release switch and wiring for any faults. If these steps don't work, you may need to manually disengage the latch or consult a professional for further assistance.
You have to remove the inside door panel to get access to the door handle nuts.
If it has one it will be in the trunk on one of the side supports.
If it's the lock itself and not the latch, you might as well replace the lock.
If it has shocks, replace them. If it has torsion bars one might be broken.