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BMW Safety-system (Airbag) system time Fault STVL STVR SBSL SBLR Satelite Solved
22-12-2017, 17:33 PM,
(This post was last modified: 22-12-2017, 17:36 PM by Yah.)
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BMW Safety-system (Airbag) system time Fault STVL STVR SBSL SBLR Satelite Solved
FUB-FUB-DAA0701FB-656577009 FUB-FUB-DAA0701FB-656577009 -
Safety system (airbag): System time - VIN: LS44xxx The BYTEFLIGHT bus system has a star-shaped structure. The individual satellites (= control units with/without sensors) are interconnected across a star coupler by means of fibre-optic cables. The star coupler in the BYTEFLIGHT bus system is the Safety and Information Module (SIM) or the Safety and Gateway Module (SGM). Depending on the vehicle, the star coupler is the SIM or the SGM. In the rest of the description, both the SIM and SGM will be mentioned. In the safety system, there is a uniform system time for all control units. On production of the vehicle, the system time is started by means of a diagnosis command. This operation is only possible once, which means that resetting the system time is not possible. The system time is increased with every synchronisation impulse generated on the BYTEFLIGHT bus. The Safety and Information Module (SIM) or Safety and Gateway Module (SGM) is the bus master controller and this responsible for generating the synchronisation impulses. The SIM or SGM sends the message ”system time” to all BYTEFLIGHT control units. The control units only adopt that time if:> - the time stored on the control unit is not greater than the time transmitted by the SIM or SGM or if - no time has yet been stored on the control unit, i.e. the control unit concerned is a new one. Main functions Synchronization of New Control Units: When a control unit in the safety system is replaced, the system time is started automatically after the coding-programming process. If the system time has not automatically been started after the coding-programming process, the fault code memory entry: ”System time error” is entered in the control unit. The service function can then be used to subsequently start the system time manually. In addition, the status ”System time started/not started” can be displayed. For the BYTE FLIGHT control units, the system time is to be started manually afterwards if this has not taken place automatically after the coding-programming process. The following procedure is then required for the BYTE FLIGHT control units: Important Service functions Notes on safety In all cases, only perform work on the fuel pump with the ignition off! All work on the airbags must be carried out with the battery disconnected! Connect and disconnect all BYTE FLIGHT control units, sensors and generators only with the battery disconnected! If a fibre-optic cable on the BYTE FLIGHT bus has to be repaired, it must be borne in mind that there may only be one join in a fibre optic cable. If there is already a join due to a door connector, the fibre-optic cable must not be repaired. In the case of a defect, the fibre-optic cable must be replaced! - if the time stored on the control unit is not greater than the time transmitted by the SIM or SGM or - if no time has yet been stored on the control unit, i.e. the control unit concerned is a new one. - Satellite: initialize system time - If no vehicle identification number or an incorrect vehicle identification number has been entered in a control unit, the system time cannot be started! The control unit must be reprogrammed first. - If a system time error occurs, this is saved in the relevant control unit. 12/21/2017 1/1 Youtube video shows how it is done: https://www.youtube.com/watch?v=70kRIsksVrY |
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