Where is the flasher relay switch located in a 2001 Volvo V40?

Please consider the fuse box to find the flasher relay. Owner's Manual will give the fuse box's exact location and may have a list of which electrical function each fuse controls (in top-to-bottom, left-to-right order). Try looking under the hood near the windshield for a rectangular plastic cover (may be labeled "fuse") which may also have a list of each fuse's function and maximum electrical current number (probably also color-coded). Turn signals may be called "position lamps", "turn signals" or "warning/emergency lamps/lights", and they may have separate fuses for lamps on right- and left sides. Fuses are easily removed with tongs or thin pliers, and you should see a single thin strip of metal inside each fuse. When you find no such piece of metal, or two separate pieces, the fuse must be replaced. You probably have a set of extra fuses in the fuse box or glove box. Fuse box may also be located under the dashboard, somewhere between the steering wheel and driver's door. Good luck!