* Under the hood in the underhood fuse box: This is the most likely location. The fuse box is typically located near the battery, often under a cover. The relay itself may be labeled, or you may need to consult your owner's manual (if you have it) or a wiring diagram specific to your car's VIN.
* Inside the passenger compartment fuse box: Less common for the blower motor relay, but possible. This is usually found under the dashboard, often accessible by removing a panel.
To find it:
1. Consult your owner's manual: This is your best bet. It should have a diagram of the fuse and relay boxes.
2. Use a wiring diagram: A wiring diagram specific to your 1993 Cadillac Sedan DeVille is the most definitive way to locate the relay. You can often find these online through automotive repair databases (some are subscription-based), or at a parts store.
3. Visual inspection: Carefully examine both fuse boxes. Relays are typically square or rectangular components with multiple terminals. Look for labels or markings that might suggest "blower motor," "HVAC," or similar.
Important Note: Before working on any electrical components, disconnect the negative terminal of your car battery to prevent accidental shorts.
