DTC 15, 16, 17: SAFING Sensor Circuit
WARNING: This page is about a different car, the 2003 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.
If DTC 15, 16 or 17 is present, replace SRS ECU. See SRS ELECTRONIC CONTROL UNIT (SRS ECU) under REMOVAL & INSTALLATION.