Brighten up your driving experience with this simple upgrade inside your underhood relay box. Simply install the All Lights On module to allow your high-beams and fog lamps to simultaneously illuminate the road ahead. Once installed the All Lights On module will keep your fog lamps on when you turn ON your high-beams. When the high-beams are NOT turned on your low-beams and fog lights will function normally. Installation Open the hood and remove the relay panel cover. Remove the relays labeled: FOG FR and DIMMER Insert the relays through the All Lights On boards with the wire connection facing towards the top of the relay. The board will make a firm connection with the relay. Reinstall the two relays back into their original location and install the relay panel cover. Operation MY2016-2023 Tacoma: High beams, low beams, and fog lights on when high beams are enabled. Application Fits 2016-2023 Toyota Tacoma with factory installed fog lamps See Instructions tab on this page for a link to the detailed installed instructions. Protected under US Trademark Reg. No. 6,068,463, US Copyright Reg No. TXu 2-413-681, and US Patents Pending