* Fuse Box (Main): This is typically located under the hood, on the driver's side, near the fender. It's usually a fairly large, rectangular box with a cover.
* Relay Box: This is usually located under the hood, also on the driver's side, but often closer to the firewall than the main fuse box. It might be attached to the inner fender or bulkhead. It's often a smaller box than the fuse box, and sometimes less obviously marked. It may contain both relays and fuses.
It's best to consult your owner's manual for the exact locations and diagrams of the fuse and relay boxes in your specific 1989 Cadillac DeVille. The manual will show you what each fuse and relay controls. If you don't have the owner's manual, you might be able to find a digital version online through a Cadillac parts website or a site specializing in owner's manuals. Searching for "1989 Cadillac DeVille owner's manual" should provide some results.
