Post Crash Alert

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

The post crash alert function is controlled by the SJB . If the Restraints Control Module (RCM) determines an impact of severity enough to deploy air bags has occurred (the air bags may or may not be deployed by the RCM ), the RCM sends a message to the Instrument Cluster (IC) over the High Speed Controller Area Network (HS-CAN) that an air bag deployable impact has occurred.

The IC sends the message to the SJB over the Medium Speed Controller Area Network (MS-CAN). The SJB activates the post crash alert function by repeatedly cycling the horn on 3 times, then off for 4 seconds, until the battery dies or the function is turned off. The hazard lights also flash with the horn sounding, but keep flashing during the horn off cycle.

The post crash alert function can be turned off by:

pressing the hazard switch (which may need to be pressed more than once).
pressing the RKE transmitter UNLOCK button.
pressing the RKE transmitter PANIC button.

The post crash alert feature acts similar to the perimeter alarm, but the horn cycle is different. The perimeter alarm function cycles the horn on and off, in regular intervals until 2 minutes and 45 seconds have elapsed, the battery dies or the function is turned off. Turning the ignition to the ON position does not deactivate the post crash alert, but deactivates an activated perimeter alarm.

The post crash alert function cannot be configured off.