To find the relevant fuses and relays, you'll need to consult your owner's manual. It will have a fuse box diagram showing the location of each fuse and what circuit it protects. Look for fuses related to the engine, fuel injection, or ignition systems. These are the most likely to affect the PCM's operation.
The fuse box is usually located under the hood, often near the battery, but the exact location might vary slightly depending on the specific model. Your owner's manual is the definitive source for this information. If you don't have the manual, you might be able to find a digital version online through a Cadillac parts website or a general automotive repair resource.
