Module, Global Telematics Box: 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 .
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. 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
Global Telematics Box Module (TBM2)
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