Test B: Crash Data Memory Full (DTC B1231): Description
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
When air bag deploys during a collision, Restraints Control Module (RCM) stores DTC B1231 in memory and flashes Code 19 on AIR BAG warning light. DTC B1231 indicates that a crash has been recorded.