DTC B1448: Side impact sensor (rear: RH) communication error; DTC B1449: Side impact sensor (rear: RH) communication impossible: Notes
WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
If DTC B1448 or B1449 is stored in the SRS-ECU, always diagnose the CAN main bus line.