Function Explanation (DTC Detection Outline)

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

During a collision, the SAS control module sends a collision signal to the PCM via the CAN signal. The PCM records a DTC by receiving a collision signal.
This DTC does not indicate a part malfunction. It indicates operation of fail-safe from safety assurance during a vehicle collision.

Fig 1: SAS Control Module System Wiring Diagram

Courtesy of MAZDA MOTORS CORP.