Description And Operation
DESCRIPTION
The Global Telematics Box Module (TBM2) system consists of the following components:
| 1. | Refer to ECALL SPEAKER . |
| 2. | Refer to GLOBAL TELEMATICS BOX MODULE (TBM2) . |
| 3. | Refer to RADIO . |
| 4. | Refer to SOS CALL BUTTON . |
| 5. | Refer to MICROPHONES . |
| 6. | Refer to COMBINATION ANTENNA . |
| 7. | Refer to OCCUPANT RESTRAINT CONTROLLER (ORC) . |
| 8. | Refer to LONG TERM EVOLUTION 2 (LTE2) ANTENNA . |
A telematics connectivity module, called the TBM2, is located behind the Integrated Center Stack (ICS) Module in the instrument panel center stack. It is part of the emergency crash notification system, which 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. 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).
In addition, other features are included in the telematics connectivity system to enhance the customer experience through interaction with the vehicle and is dependent on the market for which the vehicle is manufactured. Several applications are available, some required by government regulations, and communicate with the Global Services Delivery Platform (GSDP) in that market.
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 TBM2 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 TBM2 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 is only used in markets that require the TBM2 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 TBM2 system can be manually triggered using the SOS button by the vehicle driver or a passenger. The TBM2 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 the event that the vehicle battery connection is compromised, a backup battery is mounted within the TBM2 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 TBM2.
The TBM2 microcontroller continuously monitors all of the TBM2 system electrical circuits to determine the system readiness. If the TBM2 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 TBM2 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 TBM2.
The SGW is in the audio and telematics CAN 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 TBM2 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 TBM2 or the electronic controls and communication between other modules and devices that provide some features of the TBM2 system. The most reliable, efficient and accurate means to diagnose the TBM2 or the electronic controls and communication related to TBM2 system operation requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic information.
Modes of Operation
- ON Mode
- Ignition switch status is not considered if ignition OFF timer has not ended
- Assist/SOS buttons are armed
- CAN is active
- All TBM2 systems are active
ON Mode deactivated and mode changes to Power OFF Mode under the following conditions:
- Battery is disconnected
- Monitoring time expires - TBM2 stores the previous state
- Sleep Mode
- Ignition switch is OFF
- CAN is not active
- Assist/SOS buttons are disarmed
- TBM2 is in low power mode
- Radio is OFF
Sleep Mode deactivated and mode changes to ON Mode under any of the following conditions:
- Battery is connected
Sleep Mode deactivated and mode changes to Power OFF Mode when all of the following conditions have been met:
- Battery is disconnected
- Monitoring time expires - TBM2 stores the previous state
- Emergency/Assist Call Mode
- Battery is connected
- Assist/SOS buttons are armed and one or the other is pressed
- CAN is active
- E-Call/Assist is active
Emergency/Assist Call Mode deactivated and mode changes to ON Mode under the following conditions:
- E-Call/Assist call procedure ends via USB enabling
Emergency/Assist Call Mode deactivated and mode changes to Power OFF Mode under the following conditions:
- E-Call/Assist call procedure ends by user and the battery is disconnected
- Power Off Mode
- Battery disconnected
- Assist/SOS buttons disarmed
- Monitoring time has expired
Power OFF Mode deactivated and mode changes to ON Mode under the following conditions:
- Battery is connected
Power OFF Mode deactivated and mode changes to Logistic Mode when all of the following conditions have been met:
- Battery is connected
- Previous Logistic session is active
- Logistic Mode
- Assist/SOS buttons disarmed
- Telematic services not available
- Logistic status is set to active
Logistic Mode deactivated and mode changes to ON Mode under the following conditions:
- Vehicle starts moving
- Ignition OFF event occurs
Logistic Mode deactivated and mode changes to Power OFF Mode when all of the following conditions have been met:
- Battery is disconnected
- Monitoring time expires - TBM2 stores the previous state
- Test Mode
- Ignition is ON
- Tester is present
- Diagnostic session is active
- CAN transceivers are active
- Fake test calls available
- Test telematic services are available
Test Mode deactivated and mode changes to ON Mode under any of the following conditions:
- Test sequence is completed
- Vehicle starts moving
- Ignition OFF event occurs
Test Mode deactivated and mode changes to Power OFF Mode when all of the following conditions have been met:
- Battery is disconnected
- Monitoring time expires - TBM2 stores the previous state
- Maintenance Mode
- Assist/SOS buttons disarmed
- Ignition is ON
- Phone calls are disabled
- CAN transceivers are active
- Vehicle is in assistance garage - not moving
Maintenance Mode deactivated and mode changes to ON Mode under any of the following conditions:
- Diagnostic session is no longer detected
- Vehicle starts moving
- Ignition OFF event occurs
Maintenance Mode deactivated and mode changes to Power OFF Mode when all of the following conditions have been met:
- Battery is disconnected
- Monitoring time expires - TBM2 stores the previous state
| Refer to COMPONENT INDEX . |
The combination antenna consists of a Satellite Digital Audio Radio Service (SDARS) element, Global Positioning System (GPS) element, AM/FM element and a Long Term Evolution 1 (LTE1) element. The TBM2 system uses the GPS and LTE1 elements of the combination antenna. The LTE1 element is for data upload and download.
The combination antenna allows the MNO to locate the vehicle using the GPS element in the event the occupant cannot respond with the vehicle location.
| Refer to COMPONENT INDEX . |
The eCall system uses a single dedicated 70 mm speaker for vocal communication with the vehicle occupants during an eCall in markets where eCall is a regulatory requirement. The speaker is located to the right of the center instrument panel speaker on models that are equipped with an audio system center speaker. It is mounted to the instrument panel by two screws and connected directly to the TBM2 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 Light Emitting Diode (LED)
- power and ground to the SOS button
The TBM2 (2) is the solid state control module in the eCall system and is located on the left side of the steering column support.
The TBM2 (2) is connected to the instrument panel wiring harness using one 32-pin wiring harness connector (5) and four antenna connectors (3). The Universal Serial Bus (USB) (4) is connected between the radio and TBM2 for connectivity to the TBM2 internal WiFi antenna and diagnostics. One of the antenna connectors is connected to the Long Term Evolution 2 (LTE2) antenna for communication on the 4G cellular network, if available in the market. Two of the antenna connectors are connected for Global Positioning System (GPS) signals, one input from the combination antenna and one output to the radio. The fourth antenna connector is connected to the combination antenna for LTE1 signal use. Antenna connections vary by market.
The module is mounted to the instrument panel structural support using four bolts at each of the four mounting bosses (1).
The TBM2 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 TBM2 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 vehicle is equipped with two cellular phone (LTE) antennas. The LTE2 antenna 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 Instrument Panel Cluster (IPC). 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. In markets that require the TBM2 system, the microphones are connected directly to the TBM2, but in markets where it is optional equipment, the microphones are connected to the radio.
| Refer to COMPONENT INDEX . |
The TBM2 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 TBM2 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 TBM2 system can be manually triggered using the SOS button by the vehicle driver or a passenger. The TBM2 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 TBM2 system is required, or through the audio system speakers in markets where the TBM2 system is optional. The microphone data is sent to the TBM2 for broadcast to the PSAP.