Supplemental Restraint System

WARNING: This page is about a different car, the 2017 Ford Fusion. 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 frontal or side crash, the RCM may deploy some 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 its SRS components and circuitry for correct operation.

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.

Secondary Airbag Warning

A secondary airbag warning message is displayed and controlled by the IPC. If the RCM detects a SRS fault, the RCM sends a message to the IPC. The IPC then illuminates the airbag warning indicator. If the IPC detects a fault with the airbag warning indicator, a DTC is stored in the IPC and a warning message is displayed in the message center to indicate that a SRS fault is present.

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. On Hybrid Electric Vehicles (HEVs) or Plug-in Hybrid Electric Vehicles (PHEVs), the BECM also receives this signal.

For all vehicles, when the BCM receives the event notification signal input, it initiates fuel cutoff to disable the fuel system.

For Hybrid Electric Vehicles (HEVs) and Plug-in Hybrid Electric Vehicles (PHEVs), the BECM commands the high voltage contactors open when the event notification signal is received from the RCM.

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.