Global Telematics Box Module (TBM2)
DESCRIPTION
A telematics connectivity module, called the Global Telematics Box Module (TBM2), is located above the glovebox and below the Passenger AirBag (PAB), secured to the top of the glovebox surround.
Several consumer application 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 and communicate with the Global Services Delivery Platform (GSDP) in that market.
| 1 - LTE2 Antenna |
| 2 - TBM2 |
The TBM2 system uses the following components:
- Long Term Evolution 2 (LTE2) Antenna
- Global Telematics Box Module (TBM2)
- Radio
- Combination Antenna
- Overhead Console Switch Emergency Assist Button
| 1 - Mounting Bosses |
| 2 - TBM2 |
| 3 - Antenna Connectors |
| 4 - USB |
| 5 - Wiring Harness Connector |
The TBM2 is the solid state connectivity control module for the audio system which enables network connectivity and is located behind the center cupholder, secured to a bracket that is attached to the instrument panel carrier.
The TBM2 is connected to the instrument panel wiring harness using one 32-pin wiring harness connector and up to four antenna connectors. The Universal Serial Bus cable (USB) is connected between the radio and TBM2 for diagnostic communication between the two modules. The FAKRA antenna connectors make connections to the combination antenna for GPS data and LTE1 data, and the LTE2 antenna for communication on the 4G cellular network, if available in the market.
The TBM2 module is mounted to the glovebox surround using four bolts to secure the module mounting bosses.
The TBM2 has an internal cell phone antenna which is used in the event of the vehicle's cellphone module not operating or not operating properly.
| 1 - TBM2 |
| 2 - Backup Battery |
| 3 - Battery Cover |
The TBM2 incorporates a backup battery with a life expectancy of 5-7 years that will allow the LTE network 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.
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.
Radio
When LTE network access is in operation, the radio audio will be muted and network audio will be heard through the audio speakers.
Overhead Console Switch Emergency Assist Button
The Overhead Console Switch Emergency Assist Button is part of the Emergency SOS/Assistance system and can be used for Roadside Assistance, Sirius XM Guardian, Vehicle Customer Care, and Uconnect Customer Care.
OPERATION
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.
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. 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 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.
A combination shark fin antenna for AM/FM, cellular phone calls, Global Positioning System (GPS), Satellite Digital Audio Radio Service (SDARS) and LTE1 data is used on all models.
The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of locally broadcast radio signals in both the Amplitude Modulating (AM) and Frequency Modulating (FM) commercial frequency ranges - AM/FM/FM2 radio frequencies received.
The combination antenna also receives Global Positioning System (GPS) position data. The combination antenna module is used to provide satellite information for route calculation and vehicle positioning purposes to the navigation unit, which is integral to the radio. The antenna module receives time pulse information from the GPS satellites, then calculates and transmits altitude, latitude, longitude, number of satellites, satellite direction, satellite angle of elevation, direction, signal to noise ratio and accuracy information.
The audio system components are designed to provide audio entertainment and information through the reception, tuning and amplification of SDARS broadcast radio signals in markets where it is available.
An antenna is an electrical device which converts electric power to radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (for example, a high frequency Alternating Current/AC) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
The Overhead Console Switch Emergency Assist Button incorporates SOS/Emergency Call button LED (Light Emitting Diode) indicators that are wired directly to the Global Telematics Box Module (TBM2). The TBM2 communicates system messaging, status, and user requests over the Controller Area Network (CAN) bus to the the Body Control Module (BCM). The TBM2 controls the bicolor LED indicators (with GREEN and RED lights). The green light is used to provide updates about the eCall status and the red light is used to notify to the user of module status, self-diagnostic activities, and failures.