The flasher unit in a 1993 Subaru Impreza Sedan is typically located
under the dashboard, near the fuse box. However, the exact location can vary slightly depending on trim level and specific model year variations. You might find it easier to access it by removing the lower dash panel.
To be certain, consult a 1993 Subaru Impreza repair manual or a wiring diagram specific to your car. These will give you the precise location and may show you how to access it safely. Otherwise, you may have to do some careful searching in the area under the dash near the fuse box.