Comments by "kazedcat" (@kazedcat) on "Tesla Cybertruck Steer-by-Wire System" video.

You have a main battery and an auxiliary battery. If the main battery fails then the vehicle has no motive power but the auxiliary battery can still drive the steering system. If Aux fails then the main battery can provide power. If both fail then regenerative braking can provide emergency power.
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If you lost power of the main battery you have an auxiliary battery. If you lost both you have regenerative braking to provide emergency power. Also without the main battery the car would stop moving.
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Friction between tire and pavement.
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I suspect that each sensor module actually has two sensors so that if a sensor fails it can be detected and ignored. This is how SpaceX designed their triple redundant system.
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@Marco-rx4cg Regenerative braking can power the HV line even when the main battery is disconnected. The drive motors literally become a generator during regenerative braking. Also the steering motors are supplied with redundant powerlines. They are smart enough to design redundant steering motors and redundant control network why would you assume they would neglect redundant powerlines.
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@Marco-rx4cg The drive unit can only induce current while the car is moving. They can bleed the momentum of the car and use that energy to power the fly by wire steering.
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@Marco-rx4cg You just need a large ramp.
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@brianb-p6586 Now I am curious. What is the voltage of the auxiliary battery. Is it 48V?
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 @hugegamer5988 There are two gear housing one for each motor.
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