This is a tire pressure reset tool designed to assist in the sensor relearn procedure. After each tire rotation, tire change, body control module replacement, or tire pressure sensor replacement, the sensor 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 or mode. 2. Following the vehicle manufacturer's maintenance procedure, use the tool sequentially (front left, front right, rear right, rear left). Position the tool near the tire sidewall close to the valve stem (the air filling inlet) and press the reset button. 3. The green LED light (TX light) will illuminate, indicating the signal is being transmitted. When the vehicle’s horn or buzzer sounds, the matching process is successful. 4. Repeat the process for the remaining tires. Specifications: - Compact and portable design for easy handling and storage - Enables real-time signal transmission for sensor activation - Compatible with vehicles requiring a TPMS relearn procedure after tire service - Features diagnostic signal transmission functionality - Universal compatibility with most vehicles requiring TPMS relearning - For GM vehicles equipped with 315 MHz or 433 MHz Tire Pressure Monitoring (TPM) systems, the sensor relearn procedure is required after tire rotation, remote keyless entry receiver module replacement, or tire pressure sensor replacement. This procedure can be completed using compatible tools and applies to applicable GM models, including 2014 models. Package Included: 1 x Tire Pressure Reset Tool