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If there is a fault you also need to define what should happen.
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Depending on how serious the problem is,
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we don’t want the driver to have to pull over and stop at the roadside.
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Therefore, we need a fallback mode
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that enables the driver to keep driving until reaching a workshop.
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In our example with the cooling system:
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if the engine was overheated, one fallback mode would be to
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de-rate the engine’s performance and turn on the cooling fan.
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When the fallback mode is active, a yellow warning will be shown on the dashboard
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and the driver can continue driving the vehicle without risking an engine breakdown.
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When the fallback mode is no longer able to control the fault,
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a red warning will be shown on the dashboard and the driver is instructed to stop the vehicle.
