# System Failure (SF)

SF.1The System Failure (SF) mode is activated in case of a fault, which affects safety. In this mode, the driver is not responsible

SF-[N].1When the System failure symbol (MO18) is displayed, the driver shall attempt to troubleshoot the problem using the applicable technical information.

MO18: System failure

If this attempt fails or is not possible, the driver and signaller shall follow the steps in section DEG.OBE Managing the failure of an onboard equipment (OBE).

SF-[V].1If the System failure symbol (MO18) cannot be displayed on the DMI, the SF mode is indicated by any other means (e.g. black screen, frozen screen, dedicated lamp, sound, etc).

SF.2The following mode transitions can be triggered from SF mode:

1. NP mode. Transition triggered when the ETCS on-board is powered off as indicated in section OFF.PWR Power off the ETCS on-board (PWR)).
2. IS mode. Transition triggered when the driver isolates the ETCS on-board equipment (see section IS.ENT Entering Isolation mode (ENT)).