Test S: Left PRETENSIONER Circuit Resistance Low Or High (DTC B1885/B1877): Description
WARNING: This page is about a different car, the 2003 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
Restraints Control Module (RCM) monitors resistance in left seat belt pretensioner circuits. If RCM detects resistance that is out of expected range (high or low), it will store Diagnostic Trouble Code (DTC) B1885 or B1877 in memory and flash Code 46 on AIR BAG warning light.