This is a tire pressure reset tool designed to assist in the sensor relearn procedure. After each tire rotation or replacement of tires, the body control module, or tire pressure sensors, the relearning process must be performed to ensure accurate tire pressure readings and display. Operation steps: 1. Ensure the vehicle is in TPMS learning mode. 2. Follow the vehicle manufacturer’s maintenance procedure. Position the tool near each tire’s sidewall close to the valve stem (air inlet) in sequence (front left, front right, rear right, rear left), then press the reset button. 3. The green LED (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 and portable design - Real-time tire pressure monitoring capability - Compatible with most vehicles equipped with TPMS systems - Supports diagnostic sensing functions - For GM vehicles with 315 MHz or 433 MHz TPMS systems, including models from 2012 and later, the sensor relearn procedure is required after tire rotation, keyless entry receiver replacement, or sensor replacement. This can be completed using compatible tools such as EL-50448. Applicable to 2014 GM models. Package Included: 1 x Tire Pressure Reset Tool