Test S: Driver-Side Seat Belt PRETENSIONER Short To Battery (DTC B1878): Description

RCM checks driver-side seat belt pretensioner circuit for shorts to battery by monitoring RCM harness connector C423, terminals No. 11 (Green/Blue wire) and No. 12 (Black/Blue wire). If RCM detects short to battery on either terminal, it will store DTC B1878 in memory and flash Code 4 on AIR BAG warning light.