This is a tire pressure reset tool designed to assist in the sensor relearn procedure. After each tire rotation, or when replacing tires, the body control module, or tire pressure sensors, the relearn process must be performed to ensure accurate tire pressure value acquisition and display.Operation steps: 1. Ensure the vehicle is in TPMS learning state/mode. 2. Following the vehicle manufacturer’s instructions, use the tool sequentially (front left, front right, rear right, rear left) by positioning it near the tire sidewall close to the valve stem (the air fill inlet) and press the reset button. 3. The green LED light (TX light) will illuminate, indicating signal transmission. When the vehicle’s horn or buzzer sounds, the matching is successful. 4. Repeat the process for the remaining tires.Specifications: - Compact design for portability and easy handling - Enables real-time tire pressure system activation - Compatible with most vehicles equipped with TPMS - Supports diagnostic functions for TPMS systems - Required for GM vehicles with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems after tire rotation, remote keyless entry receiver replacement, or sensor replacement - Relearn procedure can be completed using compatible tools; applicable to 2014 and earlier GM models - Note: Only specific OEM or aftermarket diagnostic tools can access tire pressure sensor data on 2012 and later model year vehiclesPackage Included: 1 x Tire Pressure Reset Tool