Code B0074 indicates a fault in the deployment control circuit for the second-row center seat belt pretensioner, which is part of the supplemental restraint system. The pretensioner is designed to tighten the belt during a collision, and this code means the restraint control module has detected an electrical problem in that specific circuit.
The pretensioner may have been activated in a previous crash or may have an internal electrical failure. Once deployed, the pretensioner must be replaced and cannot be reset.
Wiring between the restraint control module and the second-row center pretensioner can chafe, break, or corrode, especially in areas exposed to moisture or under-seat movement.
The connector at the pretensioner or at an intermediate junction may be loose, partially unlatched, or have bent or corroded pins, causing high resistance or an open circuit.
The module that monitors the pretensioner circuit could have an internal fault, but this is uncommon and should only be considered after all wiring and the pretensioner itself have been verified.
The vehicle will drive normally, but the second-row center occupant may not have proper seat belt restraint in a crash. The SRS warning light will also remain on, which may cause inspection failure and could affect other restraint system functions.
No. B0074 is a body/restraint system code handled by the restraint control module (RCM or SDM), not the powertrain control module. Even the restraint control module is rarely the cause — the pretensioner or its wiring is far more likely.
No. Once a pretensioner has fired, it is a one-time-use device and must be replaced. There is no reset procedure for a deployed pretensioner.
Yes, if done correctly at the harness side with the pretensioner disconnected. Never apply external voltage to a pretensioner or squib circuit, as this could cause accidental deployment. Always follow the manufacturer's diagnostic procedure.