Where is the relays for the headlights on a 406?

On a Peugeot 406, the headlight relays are typically located in the fuse box, which is usually found in the engine compartment. Depending on the specific model and year, there may also be a secondary fuse box inside the cabin. It's important to consult the vehicle's owner manual for the exact location and layout of the fuse and relay box for your specific model.