How to find your car radio code and unlock your stereo - RAC
You can contact Alpine Electronics Support directly. They may provide the code if you can prove ownership.
In many cases, these tools can provide the code instantly or via email. Finding Your Alpine Serial Number
An is a tool or service designed to recover the security anti-theft code required to unlock Alpine head units after a power loss, such as a battery replacement. These codes are part of a security system that renders the unit inoperable if stolen and re-installed without the authorized 4 or 5-digit PIN. Core Functionality & Methods
You do not need to remove the radio. Press and hold the 1 and 6 preset buttons simultaneously while turning the radio on. Alternatively, press Preset 1 and Preset 4 . The screen will flash an 8 or 10-digit number (usually starting with "U" or "AL").