What does it mean?
B1426 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Side impact sensor (RH) system for fault 1 .
Symptoms
- Airbag warning lamp on continuously with the side restraint system disabled
- Right side airbag and curtain will not deploy in a side collision
- The fault stays current after clearing and often reappears within one ignition cycle
- May follow interior trim work, seat removal or water ingress into the cabin
- No mechanical or driving symptom to accompany the lamp
Likely causes
- Internal failure of the sensor's sensing element or electronics
- Water intrusion at the B pillar or sill reaching the sensor and its connector
- Sensor loose on its mounting, so it cannot read body deceleration correctly
- Sensor previously exposed to an impact or salvaged from a crashed vehicle
- High resistance or corroded terminals in the sensor connector under the trim
- Damaged supply or communication wiring between the module and the sensor
- Low battery voltage during the self test causing the sensor to report a fault
How to fix it
- Switch off the ignition, disconnect the battery and wait the specified reserve discharge period before working on the system
- Test the battery and alternator output, because marginal voltage produces false sensor fault reports
- Remove the B pillar or sill trim and check for damp insulation, water staining or a corroded connector, repairing any leak found
- Unplug the sensor and inspect both connector halves for green pins, deformed terminals and a lock that has not engaged
- Measure the supply and signal wiring back to the restraint module for continuity and insulation to ground
- Confirm the sensor is torqued down to clean bare metal and that its bracket is not bent or cracked
- Fit a correct new sensor rather than a used unit, perform any required configuration, then clear the memory and confirm the lamp goes out