This is a tire pressure reset tool designed to assist in the relearning process of tire pressure monitoring systems (TPMS). After each tire rotation, or replacement of tires, body control module, or tire pressure sensors, a sensor relearn procedure must be performed to ensure accurate tire pressure value acquisition and display.Operation steps: 1. Ensure the vehicle is in TPMS learning state or mode. 2. Following the vehicle manufacturer’s service procedure, position the tool near each tire in sequence (front left, front right, rear right, rear left), aligning it with the tire sidewall close to the valve stem (the air inlet), then press the reset button. 3. The green LED (TX light) will illuminate, indicating signal transmission. When the vehicle emits a horn beep or chirp, the matching process for that wheel is complete. 4. Repeat the process for the remaining tires in sequence.Specifications: - Compact and portable design for easy handling and storage - Enables real-time signal transmission for TPMS relearning - Compatible with vehicles requiring a relearn procedure after tire service or sensor replacement - Designed for use with GM vehicles equipped with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, including 2012 and later models - Supports the Sensor Relearn Procedure required after tire rotation, remote keyless entry receiver module replacement, or tire pressure sensor replacement - Works with diagnostic procedures for 2014 and compatible GM models using appropriate service methods Package Included: 1 x Tire Pressure Reset Tool