Many Acura TL/TSX/MDX owners experience a sudden black screen or non-responsive factory radio, especially after a battery change. In most cases, the unit isn’t broken—it’s locked by Acura’s Anti-Theft system. This guide explains why it happens, how to display your serial number using the 1 + 6 + Power method, and how to retrieve the official 5-digit Radio Code to unlock the system within minutes. A modern Android upgrade is also recommended for drivers who want to avoid future lockouts.