To find a specific relay, you'll need to:
1. Consult your owner's manual: This is the best resource. It should have a diagram showing the location of fuse and relay boxes, and often a list of what each relay controls.
2. Check the underhood fuse box: This is the most common location for many relays. It's usually a black plastic box, often near the battery. The cover should have a diagram showing the location and function of fuses and relays.
3. Check the interior fuse panel: Many LeSabres also have a smaller fuse panel inside the car, often under the dashboard. This might contain relays for interior functions.
4. Look near the component: Some relays are located near the component they control, for example, near the headlights for headlight relays.
Without knowing *which* relay you're looking for (e.g., headlight relay, fuel pump relay, etc.), it's impossible to give you a precise location. If you can tell me which system isn't working, I might be able to help narrow down the likely relay location.