Test T: Driver-Side Seat Belt PRETENSIONER Circuit Open (DTC B1877): Description

RCM checks driver-side seat belt pretensioner circuit for high resistance by monitoring RCM harness connector C423, terminals No. 11 (Green/Blue wire) and No. 12 (Black/Blue wire). If RCM detects high resistance on either terminal, it will store DTC B1877 in memory and flash Code 4 on AIR BAG warning light.