In general, fuse boxes in cars are not completely waterproof. While they are designed to provide some protection against water splashes and moisture, they are not submersible and cannot withstand high-pressure water streams. Fuse boxes are typically located in compartments under the hood or inside the vehicle's cabin, but these areas are not meant to be watertight.
Fuse boxes contain sensitive electrical components, and exposing them to excessive water can cause damage, short circuits, or electrical malfunctions in vehicle systems. Therefore, it is important to avoid water from entering the fuse box and keep it dry to prevent problems and safety hazards.