Features EL-50448 tpms reset tool can help you reprogram all tires much easier just with 3 steps.Tire pressure monitor sensor activation tool is simple, fast and easy to use, activates the individual TPM sensor with the press of one button An essential tool of replacement tire pressure sensor, tire pressure alarm remove or exchange tires.Works on most General Motors (Chevy/Buick/GMC/Opel) equipped with 315 or 433 MHz Tire Pressure Monitor system (TPMS) sensor. How to Use: Ensure that the vehicle is in the TPMS Learn Mode, and follow the service procedure. Hold tool against the sidewall of the tire, near the valve stem. Depress Learn button while holding the tool against the tire sidewall. For Different vehicle EL50448 may need different times to reset all of your tire sensors after rotation Notice: 1. When using EL50448, please make sure antenna in correct position. 2. Please make sure the 9v battery in good condition How to use Step 1 - Enter leaning mode Set the gearshift lever to P Put the ignition switch to ON Enter the interface of tire pressure display by DIC DIC shows Press Set / Ctrl to re-learn Press Set / Ctrl The turn signal is lighted for 3 seconds and the horn beep sound twice to enter the learning mode Step 2 - Read tire pressure sensor information Start from the front-left wheel Make the J-46079 or Diagnostic Tool EL-50448 antenna up against the valve core position close to the rim of the tire sidewall El-50448 tire pressure tool starts by the start switch Successful to read the tire pressure sensor information when the horn bleeps once Step 3 - Same method to read other tire pressure information Follow the instruction above to read tire pussure of the front-right, rear-right, rear-left wheels Turn signals is lighted for 3 seconds and the horn bleeps twice when the learning is complete Whats in the package 1 x EL-50448 tool