Code B0077 indicates a fault in the deployment control circuit for the third-row center seat belt pretensioner. The Supplemental Restraint System (SRS) module has detected an electrical anomaly, such as an open circuit or high resistance, that prevents the pretensioner from operating correctly.
Wiring to the third row is frequently pinched or frayed due to the folding and unfolding of rear seats.
The pyrotechnic squib or internal mechanism of the pretensioner has failed or developed an internal open circuit.
Moisture or debris in the rear cabin area can cause corrosion at the pretensioner electrical connector.
An internal circuit failure within the airbag control module is rare but possible.
No. Applying external voltage to a pretensioner circuit can trigger an accidental deployment, which is dangerous and will destroy the component.
No. Because the third row is subject to physical wear from seat movement, wiring damage is significantly more likely than a module failure.
The vehicle is drivable, but the third-row center seat belt may not tighten properly during a collision, and other airbags may be disabled depending on the vehicle's safety logic.