Reverse light's not working

There's four different models of Cutlass. None of the service literature does a good job showing the switch locations. This first image is for the Ciera. The second one is the circuit diagram and is the same for the Ciera and the Ciera Cruiser. The third one is for the Cutlass Supreme. There's also the Salon model, but there was no information for that one.

Notice in the second diagram, they list the switch as, "top of the transaxle", and at the bottom of the first one, it says some models don't use a neutral safety switch. Does that help? If not, let me know which model you have.