Description And Operation
DESCRIPTION
The emergency crash notification system consists of the following components:
| 1. | Refer to EMERGENCY ASSISTANCE MODULE (EAM) . |
| 2. | Refer to MICROPHONES . |
| 3. | Refer to SOS/ASSIST CALL BUTTONS . |
| 4. | Refer to BODY CONTROL MODULE (BCM) . |
| 5. | Refer to LONG TERM EVOLUTION 1 (LTE1) ANTENNA . |
| 6. | Refer to GLOBAL POSITIONING SYSTEM (GPS) AND SATELLITE DIGITAL AUDIO RADIO SERVICE (SDARS) ANTENNA . |
| 7. | Refer to OCCUPANT RESTRAINT CONTROLLER (ORC) . |
| 8. | Refer to ECALL SPEAKER . |
| 9. | Refer to RADIO . |
| 10. | Refer to LONG TERM EVOLUTION 2 (LTE2) ANTENNA . |
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), either as an option or as standard equipment in markets that require it and are connected to the GLONASS Emergency Response Assist System. 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 Security Gateway Module (SGW) is the Controller Area Network (CAN) gateway between the radio, telematics modules, Data Link Connector (DLC) and the other vehicle CAN modules. An SGW failure could prevent the radio from powering up, telematics module from communicating or a scan tool from communicating with the vehicle. For additional information on the SGW, Refer to MODULE, SECURITY GATEWAY (SGW), DESCRIPTION AND 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 Output Digital Serial line from the ORC is only used in markets that require the EAM system. 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 radio audio will be muted and eCall audio will be heard through the eCall speaker in markets that require EAM.
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 (1), in markets that require the EAM system, for vocal communication with the vehicle occupants during an eCall. The speaker is located at the front of the center console where the instrument panel meets the center console. 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 (5) module data
- ignition status from the BCM (7)
- microphone (2) data
- vehicle configuration
- Supplemental Restraint System (SRS) indicator status from the IPC
- Daytime mode from the BCM (7)
- language from the IPC
- crash event data
Outputs
- phone communication to the eCall speaker (6)
- global positioning information to the cell phone module (8)
- vehicle data to the BCM (7)
- eCall status to the BCM (7)
- audio mute
- illumination of the SOS button Light Emitting Diode (LED)
- power and ground to the SOS button (3)
The EAM (2) is the solid state control module in the eCall system and is located on the right inner side of the steering column support on left hand drive vehicles, and on the left inner side of the steering column support on right hand drive vehicles.
The EAM (2) is connected to the instrument panel wiring harness using one 32-pin wiring harness connector (5) and four antenna connectors (4). The Universal Serial Bus (USB) is connected between the radio and EAM for connectivity to the EAM internal Wi-Fi antenna. Three of the antenna connectors make connections to the GPS/SDARS antenna for GPS data, the LTE1 antenna and LTE2 antenna for communication on the 4G cellular network, if available in the market. The fourth antenna connection is a pass-through for GPS data to the radio.
The EAM module is mounted to the instrument panel structural support using two bolts to secure the two rear mounting bosses (1). The other two mounting bosses (1) are held in place by the EAM bracket using a slip-in pressure fit at the front of the bracket.
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.
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 GPS/SDARS antenna (1) allows the MNO to locate the vehicle in the event the occupant cannot respond with the vehicle location.
| Refer to COMPONENT INDEX . |
The vehicle is equipped with two cellular phone antennas. The LTE1 antenna (1) is used for sending and receiving cellular telephone signals and data. The signals and data are supplied to the radio and telematics modules.
The LTE1 antenna is mounted in the center of the middle sports bar, to the left of the GPS/SDARS antenna (if equipped). The use of two LTE antennas is for the purpose of increasing data upload and download speeds.
| Refer to COMPONENT INDEX . |
The second cellular telephone antenna is the LTE2 antenna (1) and is used for sending and receiving cellular telephone signals and data. The signals and data are supplied to the radio and telematics modules.
The LTE2 antenna is mounted in the instrument panel, behind the headlamp switch. The use of two LTE antennas is for the purpose of increasing data upload and download speeds.
The LTE2 antenna has an internal 10 kilohm resistor to set a Diagnostic Trouble Code (DTC) in the module to which it is connected if the antenna cable or LTE2 antenna is disconnected from that module.
| Refer to COMPONENT INDEX . |
Two stereo microphones are in the upper windshield header trim just above the rearview mirror centered between the sun visors on the windshield. However, only the left microphone (1) is used in the EAM system. In markets that require the EAM system, the left microphone is connected directly to the EAM, but in markets where it is optional equipment, the microphone is connected to the radio. When the left microphone is connected directly to the EAM, the EAM also acts as a pass-through for the left microphone signal to the radio for use in the Uconnect® hands free system.
The microphone data is sent to the EAM for broadcast to the PSAP.
| 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 Output Digital Serial line is only used in markets that require the EAM system. 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 radio 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 (1) 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 radio audio will be muted and eCall audio will be heard through the eCall speaker, in markets where the EAM system is required, or through the audio system speakers in markets where the EAM system is optional. The microphone data is sent to the EAM for broadcast to the PSAP.