Description And Operation: 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: SECURITY GATEWAY MODULE - DESCRIPTION AND OPERATION .
The TBM2 micro controller 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 tool. Refer to the appropriate diagnostic information.
Combination Antenna
The combination antenna consists of a Global Positioning System (GPS) element, Satellite Digital Audio Radio Service (SDARS) 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 use of two LTE antennas (LTE1 and LTE2) is for the purpose of increasing data upload and download speeds.
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.
Global Telematics Box Module (TBM2)
| 1 - Mounting Bosses |
| 2 - TBM2 |
| 3 - Antenna Connectors |
| 4 - USB Connector |
| 5 - Harness Connector |
The TBM2 (2) is the solid state connectivity control module for the VP2R audio system, if equipped, for network connectivity and is located above the left side of the glove box and to the left of the Passenger Air Bag (PAB), secured to a bracket that is attached to the instrument panel carrier.
The TBM2 (2) is connected to the instrument panel wiring harness using one 32-pin wiring harness connector (5) and up to four antenna connectors (3). The Universal Serial Bus cable (USB) (4) 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 TBM2 bracket using four bolts to secure the module mounting bosses (1). The TBM2 bracket is secured to the instrument panel carrier by two bolts, one located at the each end of the bracket.
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.
| 1 - TBM2 |
| 2 - Backup Battery |
| 3 - Backup Battery Cover |
The TBM2 incorporates a backup battery (2) with a life expectancy of 5-7 years that will allow the network connectivity 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 call back capability for at least one hour after a vehicle emergency.
Long Term Evolution 2 (LTE2) Antenna
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 radio or Display Screen Module (DSM), as equipped. 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.