1989 Other Oldsmobile Models door locks, power seats and rear

All the door locks, rear defrost and power seats went out at the same time. I checked the fuses and replaced the relay switch behind the glove box that was clicking when we tried to lock the doors, but that did no good. I saw something about a fuseable link in the engine except, if that link was bad why would the relay behind the glove box still click? If it can be the fusable link in the engine, where would it be found in the 3800 engine? Thanks