Mercedes-Benz S-Class 2019 Operator's Manual page 537

Vehicle
Warning/indicator lamp
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Power steering system
warning lamp
Possible causes/consequences and
The red power steering system warning lamp is lit while the engine is running.
The power-assisted steering or the steering itself is malfunctioning.
& WARNING Risk of accident if steering capability is impaired
If the steering does not function as intended, the vehicle's operating safety is jeopardized.
Pull over and stop the vehicle safely as soon as possible, paying attention to road and traffic conditions. Do
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not continue driving under any circumstances.
Consult a qualified specialist workshop.
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Observe the messages on the multifunction display.
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Display messages and warning/indicator lamps 535
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