This wiring harness is required for the OEM fog light upgrade for VW Golf 4, Bora Suitable for fog lights mounted on the headlight assembly This wiring harness connects the fog lights to the central electric unit, relays and light switch Easy installation Selectable options: with light switch without light switch Scope of delivery: relay cable set relay holder light switch (only with item 30011-1) Note: a light switch with fog light function is required