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Is there a general rule of thumb for signalling the likelihood ofYou have to be very careful that the additional complexity doesn't itself introduce new annoying failure modes. My previous car had filament bulb failure sensors (new one is LED) of which the one for the parking light had itself failed - the parking light still worked. However, the car would great me with "parking light failure" every time I started the engine and the main dealer refused to cancel it.
an "imminent" (for some value of "imminent") hardware failure?
I suspect most would involve *relative* changes that would beMonitoring temperature, voltage supply and current consumption isn't a bad idea. If they get unexpectedly out of line something is wrong. Likewise with power on self tests you can catch some latent failures before they actually affect normal operation.
suggestive of changing conditions in the components (and not
directly related to environmental influences).
So, perhaps, a good strategy is to just "watch" everything and
notice the sorts of changes you "typically" encounter in the hope
that something of greater magnitude would be a harbinger...
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