Module, Global Telematics Box: Description
A telematics connectivity module, called the Global Telematics Box Module (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.
- Long Term Evolution 2 (LTE2) Antenna
- eCall Speaker
- Global Telematics Box Module (TBM2)
- Radio
- SOS Button on Interior Rear View Mirror
- Combination Antenna
- Microphone
- Occupant Restraint Controller (ORC)
The TBM2 (2) is the solid state control module in the eCall system and is located behind the radio.
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 Wi-Fi antenna. The four antenna connectors are connected to the Long Term Evolution 2 (LTE2) antenna for communication on the 4G cellular network, if available in the market, the LTE1 antenna, the GPS antenna input and a GPS output to the radio. 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 (1) 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.
Combination Antenna
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.
eCall Speaker
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 rear 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.
Long Term Evolution 2 (LTE2) Antenna
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.
Microphones
Two stereo microphones are in the headliner above the driver and passenger seating positions. In markets that require the TBM2 system, the left microphone is connected directly to the TBM2 and the right microphone is connected to the radio, but in markets where it is optional equipment, both microphones are connected to the radio.
Occupant Restraint Controller (ORC)
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.
Radio
When eCall is in operation, the radio audio will be muted and eCall audio will be heard through the eCall speaker.
SOS call button
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.