1. Open the hood of your vehicle.
2. Locate the fuse/relay box in the engine compartment. It is usually located near the battery.
3. Remove the cover of the fuse/relay box.
4. Locate the fog light relay. It is usually labeled as "FOG" or "FOG LAMP".
5. Remove the fog light relay from the fuse/relay box by gently pulling it out.
6. Inspect the fog light relay for any signs of damage or corrosion.
7. If the fog light relay is damaged or corroded, replace it with a new one.
8. Reinstall the fog light relay and the cover of the fuse/relay box.
9. Close the hood of your vehicle.
Here is a diagram of the fuse/relay box for a 1999 Volvo S80:
[Image of the fuse/relay box for a 1999 Volvo S80]
The fog light relay is located in position 16.
