Code B0048 indicates a fault within the deployment control circuit for the third-row right-side airbag. This diagnostic trouble code signifies that the Restraints Control Module (RCM) has detected an electrical anomaly, such as high resistance, low resistance, or a short to ground/power, preventing the system from verifying the integrity of that specific squib circuit.
The internal igniter (squib) within the airbag module itself has failed or developed excessive resistance, which is the most common source of this code.
Wires leading to the third-row seat area often suffer from fatigue due to seat folding mechanisms or cargo loading, causing breaks or shorts in the circuit.
Corrosion, bent pins, or loose mating at the yellow airbag connector under the seat or in the trim panel can interrupt the deployment signal.
If the wiring route passes through a rotational joint to reach the third row, a failure in this component can break the circuit continuity.
Internal failure of the control module is rare and should only be considered after all external wiring and the airbag module have been ruled out.
While the vehicle is drivable, the third-row right-side airbag will not deploy in a collision, significantly reducing occupant safety in that seating position.
No, replacing the control module is rarely the solution for B0048; the fault is almost always located in the airbag squib itself or the wiring harness leading to it.
The code may be temporarily cleared with a scan tool, but the warning light will typically reappear once the system runs its self-check if the underlying electrical fault persists.
Folding or moving the seats can stress the wiring harness or dislodge connectors located beneath the seat cushions, causing an open or short circuit.