Description And Operation: Notes

DESCRIPTION 

Courtesy of CHRYSLER GROUP, LLC

The emergency crash notification system consists of the following components:

1.	Refer to OCCUPANT RESTRAINT CONTROLLER (ORC) .
2.	Refer to ECALL SPEAKER .
3.	Refer to EMERGENCY ASSISTANCE MODULE (EAM) .
4.	Refer to RADIO RECEIVER MODULE (RRM) .
5.	Refer to SOS CALL BUTTON AND MICROPHONES .
6.	Refer to BODY CONTROL MODULE (BCM) .

In vehicles manufactured for certain export markets, an emergency crash notification system is included in the vehicle to automatically initiate an audio emergency call (eCall) to a Public Safety Answering Point (PSAP). An eCall can be manually triggered by the vehicle occupant if so desired. When triggered, whether automatically or manually, the vehicle eCall system will also attempt to send a Minimum Set of Data (MSD) to a public Mobile Network Operator (MNO) concerning the vehicle location and Vehicle Identification Number (VIN).

OPERATION 

The EAM system will detect an eCall trigger, whether automatic through a crash severe enough or manual at a vehicle occupant's request by pressing the SOS button. Once triggered, the system will attempt to send an MSD to any public system operated by an MNO and also attempt to establish a voice connection between the vehicle and the PSAP. When connected to the MNO, the vehicle will transfer the vehicle location and VIN.

The EAM system is triggered automatically when the ORC sends a signal using the CAN - Chassis (CAN-C) data bus or the Output Digital Serial line. The severity of the crash will determine if an eCall is sent or not. This will include direction of the impact, whether frontal, side, rear or rollover.

The EAM system can be manually triggered using the SOS button by the vehicle driver or a passenger. The EAM will actuate the system in the same manner as if it had been triggered automatically by the ORC. When eCall is in operation, the RRM audio will be muted and eCall audio will be heard through the eCall speaker.

In the event that the vehicle battery connection is compromised, a backup battery is mounted within the EAM to ensure the integrity of the system and a continuation of an eCall if the vehicle battery becomes disconnected while a call is in progress. If the backup battery becomes discharged, a message will be indicated in the Instrument Panel Cluster (IPC) and a diagnostic code set in the EAM.

The EAM microcontroller continuously monitors all of the EAM system electrical circuits to determine the system readiness. If the EAM detects a monitored system fault, it sets an active and stored Diagnostic Trouble Code (DTC) and sends electronic messages to the IPC and BCM over the CAN data bus to turn ON the EAM indicator. An active fault only remains for the duration of the fault, or in some cases for the duration of the current ignition cycle, while a stored fault causes a DTC to be stored in memory by the EAM.

The SGW is in the audio and telematics systems to provide security against certain types of attacks and threats from the scan tool, telematics and entertainment buses, which can put the rest of the vehicle's buses at risk of intrusion. The SGW lies electrically between the vehicle on one side, and the DLC, telematics and entertainment systems on the other side. The main function is to gate messages from one bus to another. The SGW monitors the B+ Feed, switched ignition feed, CAN circuits, software and hardware for any concerns.

The hardwired inputs and outputs for the EAM may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the EAM or the electronic controls and communication between other modules and devices that provide some features of the EAM system. The most reliable, efficient and accurate means to diagnose the EAM or the electronic controls and communication related to EAM system operation requires the use of a diagnostic scan. Refer to the appropriate diagnostic information.