What does it mean?
B1419 is a Body (airbags, seat belts, body electronics) fault code. It indicates: SIS (Side Impact Sensor) Rear-Passenger Defect .
Symptoms
- Airbag warning lamp on permanently with the restraint system inhibited on that side
- Rear right curtain and side airbag will not deploy in a collision
- Code returns as current straight after being erased
- Fault often appears together with damp carpet or a musty smell in the rear of the cabin
- Driving, braking and all other systems remain normal
Likely causes
- Failure of the sensing element or the electronics inside the sensor body
- Moisture reaching the sensor after a leaking rear window seal, door membrane or boot area
- Sensor damaged by a previous side impact, even one that did not trigger deployment
- Reused sensor from an accident vehicle, which many manufacturers consider single use after a crash
- Corroded connector letting the sensor supply drop below its working threshold
- Poor mounting to the pillar or sill, leaving the sensor loose and reading erratically
- Faulty restraint control module channel evaluating that sensor
How to fix it
- Disconnect the battery and allow the specified reserve discharge time before touching the restraint wiring
- Test the battery and charging voltage first so a supply problem is not mistaken for a defective sensor
- Pull back the rear right sill or pillar trim and check for water ingress, then repair the leak before replacing anything
- Unplug the sensor and inspect both connector halves for corrosion, deformed terminals and a lock that is not fully home
- Verify the sensor is bolted tightly to clean bare metal at the correct torque
- Where the part number is shared, exchange it with the opposite side sensor to see whether the defect moves with the unit
- Install a new sensor of the specified part number, run any required configuration, clear the fault memory and confirm the warning lamp extinguishes