Where is the relay switch on a 1993 Cutlass Ciera S Oldsmobile four door?

There isn't a single, easily accessible "relay switch" in the way you might be picturing. Relays in a 1993 Oldsmobile Cutlass Ciera S are typically housed in a few different locations, often in fuse boxes under the hood and inside the car (usually under the dash). They're not switches you flip; they're small electrical components.

To find the specific relay you need, you'll need to:

1. Consult your owner's manual: This is the best place to start. The manual should have a diagram showing the location of fuse boxes and might even list which relays are in each box and what they control (headlights, fuel pump, etc.).

2. Identify the circuit: What are you trying to troubleshoot? Knowing which system isn't working (e.g., headlights, turn signals, power windows) will help you determine which relay to look for.

3. Check under the hood: The main fuse/relay box is usually under the hood, often near the battery. It will have a cover that can be removed to access the relays. These are often square or rectangular components with several terminals.

4. Check under the dash: There might be a smaller fuse/relay box under the dash, usually on the driver's side.

Without knowing what circuit you're working on, it's impossible to give a precise location. The relays themselves are usually identified by numbers or symbols printed on them, or by their position in the fuse box diagram (as shown in your owner's manual). If you can provide the circuit you're troubleshooting, I may be able to give more specific guidance.