However, the exact location of the *rear defroster fuse itself* within that box will vary. You'll need to consult your owner's manual. The manual will have a diagram showing the fuse box layout and indicating which fuse controls the rear defroster.
Without the manual, you'll have to carefully examine the fuse box, looking for a diagram printed on the inside of the cover or on the fuse box itself. The diagram should list each fuse and what circuit it protects.
