Test AJ: Left PRETENSIONER Circuit Short To Ground (DTC B1879): Description
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
Restraints Control Module (RCM) monitors resistance on left seat belt pretensioner circuits. If RCM detects a short to ground, it will store Diagnostic Trouble Code (DTC) B1879 in memory and flash Code 17 on AIR BAG warning light.