COMPATIBLE MODELS: 6 high mod compatible with 2003-2006 Avalanche 1500/ Escalade EXT; 2003-2007 Silverado/ Sierra 1500/2500/3500; 2003–2007 GMT 800 trucks; 2004-2006 Escalade, Tahoe, Yukon LET THE FRONT LAMPS ON: AFEISOL light module allows your high&low beams and fog lights to be turned on simultaneously, easily illuminating the road ahead. It is particularly suitable for use in harsh environments such as darkness, dense fog, and heavy rain, ensuring your safe driving.（Note: Once installed the light module, the high beams & low beams & fog lamps will all turn on when you turn on the high beams. When the high beams are not turned on, the low beam and fog lights will work normally） EXCELLENT PERFORMANCE: This all lights on module is made of FR-4 PCB material, with sturdy structure, safety and durability, enhancing your driving experience EASY INSTALL: Find the fuse box and remove the relays labeled as fog Lp, Hdlp-low, Drl, Hdlp-hi. Align and lay down the circuit board, reinstall the relay back to original position to complete the installation GOOD SERVICE: If you have any questions or are not completely satisfied with the all lights on module, you can immediately call us through Amazon messaging, we will help you solve the problem 6 High Mod, Light Module for Fog Lights&Low Beams&High Beams Lamp on Simultaneously, Compatible with 2003-2007 Silverado Sierra 1500/2500/3500 Classic