Failing that, you'll need to:
* Check the under-hood fuse box: This is the most common location for relays. The box cover *should* have a diagram showing what each fuse and relay controls.
* Check the interior fuse panel: Some vehicles have relays located inside the passenger compartment fuse box, usually under the dashboard. Again, check the cover diagram.
* Consult a wiring diagram: A wiring diagram for your specific vehicle will show the exact location of the wiper relay and its connection points. These are sometimes available online, but often require a subscription to a repair database.
Important Note: Before working with electrical components, always disconnect the negative battery terminal to prevent short circuits and damage.
