For 1978-'88 G-Body (Cutlass, Monte Carlo, & Pontiac Grand Prix) & 1982-'87 Buick Grand National.  Does your car not lock or unlock when you press the button on the inside of your car?  Chances are your door lock actuator has gone out and will need to be replaced.  This door lock actuator is a replacement for the original part and built better to ensure the same fit, function, quality, and lasts for many years!