You'll need to consult your owner's manual or a wiring diagram for your specific Wrangler model (there were variations) to pinpoint the exact location of the blower motor relay within the PDC. The relay itself is usually a standard automotive relay, and may be labeled, but relying solely on labels isn't always reliable. The wiring diagram will show the correct relay position.
Because there are several relays within the PDC, it's best to use a multimeter to test the relay for continuity and proper operation rather than relying on visual identification alone.
