Description And Operation

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.

Refer to COMPONENT INDEX .

Inputs

• eCall status from EAM
• vehicle data

Outputs

• ignition status
• Daytime mode

Refer to COMPONENT INDEX .

The eCall system uses a single dedicated 70 mm speaker for vocal communication with the vehicle occupants during an eCall. The speaker is located below the instrument panel defroster grill to the right of the center audio speaker. It is mounted to the instrument panel by two screws and connected directly to the EAM via the wiring harness.

Refer to COMPONENT INDEX .

Inputs

• global positioning information
• emergency (SOS) button pressure status
• ORC module data
• ignition status from the BCM
• microphone data
• vehicle configuration
• Supplemental Restraint System (SRS) indicator status from the IPC
• Daytime mode from the BCM
• language from the IPC
• crash event data

Outputs

• phone communication to the eCall speaker
• global positioning information to the cell phone module
• vehicle data to the BCM
• eCall status to the BCM
• audio mute
• illumination of the SOS button LED
• power and ground to the SOS button

Courtesy of CHRYSLER GROUP, LLC

The EAM (2) is the solid state control module in the eCall system and is located in the center of the instrument panel behind the Integrated Center Stack (ICS).

The EAM (2) is connected to the instrument panel wiring harness using one 32-pin wiring harness connector (5) and three antenna connectors (4). The Universal Serial Bus (USB) and fourth antenna connector (3) are not used at this time. The module is mounted to the instrument panel structural support using four bolts at each of the four mounting bosses (1).

The EAM has an internal cell phone antenna which is used in the event of the vehicle's cell phone module not operating or not operating properly.

Courtesy of CHRYSLER GROUP, LLC

The EAM incorporates a backup battery (2) with a life expectancy of 5-7 years that will allow the eCall system to continue to work in case of vehicle power interruption. The battery will allow call and data transfer for at least 15 minutes with callback capability for at least one hour after a vehicle emergency.

Refer to COMPONENT INDEX .

The EAM system is triggered automatically when the ORC sends a signal using the 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.

Refer to COMPONENT INDEX .

When eCall is in operation, the RRM audio will be muted and eCall audio will be heard through the eCall speaker.

Refer to COMPONENT INDEX .

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. The microphones, located on top of the rear view mirror, send their data to the EAM for broadcast to the PSAP.