1. [Function]: The headlight dimmer switch allows a driver to adjust the brightness of their headlights to match the level of light that is available at any given moment. When the headlight switch went out or the LED dash lights started flicker, it's time to replace your headlight dimmer switch for a safe driving. Our headlamp switch was tested to strict standards for reliable operation and long service life, OEM design ensure perfectly drop-in fit your factory light switch. 2. [Compatibility]: This headlamp dimmer switch replacement for 2003 2004 2005 2006 Chevy Silverado 1500 1500HD 2500HD 3500, 03-04 Silverado 2500, 03-06 Suburban 1500 2500Avalanche 1500 2500Tahoe, 2007 Silverado 1500 1500HD 2500HD 3500 Classic, 2003-2006 GMC Sierra 1500 1500HD 2500HD 3500 Yukon, 07 Sierra 1500 1500HD 2500HD 3500 Classic, 03-04 Sierra 2500, 03-06 Cadillac Escalade, 03-06 Hummer H2. Before purchasing this order, please check the description to confirm your vehicle model. 3. [Replace OE]: 19381535, D1595G, 15194803, 1802-311218, 1S8489, 53-22773. Easy to install, direct replacement for original factory headlight control switches. Plug and Play. Including features Low beam headlights, Parking lamps, Automatic mode, Dome override, Instrument panel brightness & OFF. 4. [Premium Quality]: Made of Eco-friendly and durable ABS material to support scratch-resistant, smoothly surface and soft-touch. With high-tech internal circuit boards, OE-Like design ensures structural integrity and reliable operation.