The turn signal flasher relay on a 1992 Chevy Lumina is typically located
under the dashboard, near the fuse box. However, the exact location can vary slightly. It's often behind a panel that needs to be removed to access it. You might find it clipped to the fuse block itself, or in a nearby area.
To find it, you'll likely need to consult a wiring diagram specific to your 1992 Chevy Lumina or search online for photos showing the fuse box and surrounding area in that model. A repair manual for your year and model will be the most definitive guide.