To find it, you'll likely need to:
* Remove the lower dash panel: This usually involves removing some screws and possibly some plastic clips. Be careful not to break any clips.
* Look near the steering column: The flasher relay is usually mounted to a bracket or secured with a clip somewhere in that area. You may need a flashlight to see properly.
* Consult a repair manual: A shop manual specific to your 1997 Cadillac Sedan DeVille will have a diagram showing the exact location and how to access it.
Important Note: Before working on any electrical components, disconnect the negative battery cable to prevent short circuits and injury.