Supplemental Restraint System

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

The SRS is controlled by the RCM, which continually monitors various inputs. When these inputs indicate a crash, the RCM may deploy certain SRS components, based upon the severity of the crash and the sensor inputs.

Although some deployable devices may not have activated for all occupants during a crash, it does not mean that something is wrong with the SRS.

The RCM performs a self-test of the complete SRS during each startup. In addition to the self-test at start up, the RCM continuously monitors all of the SRS components and circuitry for correct operation.

Airbag Warning Indicator

The airbag warning indicator:

proves out by lighting for 6 seconds and then turning off.
flashes and/or illuminates based on the message the IPC receives from the RCM.
illuminates if the IPC does not receive a message from the RCM.

When the ignition is turned ON during normal operation, the IPC illuminates the airbag warning indicator continuously for 6 seconds. If the SRS is free of faults, the airbag warning indicator turns off and remains off. If a SRS fault exists, the airbag warning indicator illuminates and remains illuminated for the rest of the ignition cycle. The RCM communicates with the IPC via the HS-CAN. The IPC illuminates the airbag warning indicator based on messaging from the RCM. The IPC also illuminates the airbag warning indicator if there is no communication between the RCM and IPC.

Event Notification Signal

The event notification feature provides other vehicle subsystems with information pertaining to SRS deployment or fuel cutoff status. When an impact occurs which exceeds a pre-determined threshold, the RCM sends a signal on a dedicated circuit to the BCM.

When the BCM receives the crash signal input, it initiates fuel cutoff to disable the fuel system.

After the fuel system is disabled, the vehicle can be re-started after carrying out the following steps:

Turn the ignition OFF.
Turn the ignition ON.
Turn the ignition OFF.
Turn the ignition ON.

SOS Post-Crash Alert System™

The SOS Post-Crash Alert System™ is controlled by the BCM, but initiated by the RCM.

When a deployment or fuel cutoff event occurs, the RCM sends a message on the HS-CAN to the BCM. The BCM flashes the turn signal lamps and may sound the horn (except when Emergency Assist is active) until the system is turned off. The system can be turned off 10 seconds after a crash event by pressing the hazard switch, pressing the UNLOCK or PANIC button on the RKE transmitter or by cycling the ignition as shown:

Turn the ignition OFF.
Turn the ignition ON.
Turn the ignition OFF.
Turn the ignition ON.

The BCM also unlocks the doors and illuminates the courtesy lamps after a crash event.