This wiring harness is required for the OEM fog light retrofit for VW Passat 3B, 3BG Easy commissioning in minimal time (approx. 30 min.) This harness connects the fog lights to the central electrical system, relay and light switch Selectable options: with light switch without light switch Scope of delivery: Wiring harness Relay Relay material Note: In order for the headlights and fog lights to operate separately, a new light switch is recommended