1. The Dual Fan Upgrade Harness kit, this is an aftermarket replacement item. 2. All wire connectors are strictly tested and assembled, and all wiring is subject to quality assurance testing to ensure the continuity of all terminals. 3. Made in accordance with the oem specifications, matching with the car, easy to install. 4. Installation Notes: This ECU Control Dual Electric Fan Upgrade Harness Kit has white and green wire pins. The PCM has green (C2)/ blue (C1) and red connectors. Secure the ECM white wire to slot # 33 on C2; Secure the ECM green wire to slot # 42 on C1. Done using an HP tuner or other tuning device that unlocks the PCM to turn on. Partially matched reference model: Compatible with 2002 to 2006 Chevy Avalanche 1500 2500 Compatible with 2002 to 2006 Chevy Escalade/ Escalade EXT Compatible with 2003 to 2006 Chevy Escalade ESV Compatible with 1999 to 2006 Chevy Silverado 1500 Pickup/ 2500 Pickup Compatible with 2007 Chevy Silverado 1500 Pickup classic style/ 2500 Pickup classic style/ 3500 Pickup classic style Compatible with 2001 to 2006 Chevy Silverado 3500 Pickup Compatible with 2000 to 2006 Chevy Suburban 1500/ 2500 Compatible with 2000 Chevy Tahoe/ Chevy Silverado style Compatible with 2001 to 2006 Chevy Tahoe Compatible with 1999 to 2006 GMC Sierra 1500 Pickup/ 2500 Pickup Compatible with 2007 GMC Sierra 1500 Pickup classic style/ 2500 Pickup classic style/ 3500 Pickup classic style/ Denali classic style Compatible with 2001 to 2006 GMC Sierra 3500 Pickup Compatible with 2002 to 2006 GMC Sierra Denali Compatible with 2001 to 2006 GMC Yukon Compatible with 2000 to 2006 GMC Yukon XL 1500/ 2500 Petrol/ Gas engines only, does not fit diesel Package: 1 pcs Dual Fan Upgrade Harness Kit