To find it, you'll likely need to:
* Locate the fuse box: This is usually under the dashboard, often on the driver's side.
* Look around the fuse box: The flasher relay is often a small, square or rectangular unit near or within the fuse box itself. It may be plugged into a socket or secured with a clip. Sometimes it's in a separate compartment adjacent to the fuse box.
* Consult a wiring diagram: A wiring diagram specific to your 1989 Pontiac Lemans would show the exact location. You can find these online through parts websites or automotive repair manuals.
Remember to disconnect the negative battery terminal before working with electrical components.