Lexus LS 600h L 2012 Owner's Manual page 510

If the malfunction indicator lamp comes on while driving
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First check the following:
Is the fuel tank empty?
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If it is, fill the fuel tank immediately.
Is the fuel tank cap loose?
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If it is, tighten it securely.
The light will go off after taking several driving trips.
If the light does not go off even after several trips, contact your Lexus dealer as soon
as possible.
Electric power steering system warning light
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When the 12-volt battery charge becomes insufficient or the voltage temporarily
drops, the electric power steering system warning light may come on.
CAUTION
When the electric power steering system warning light comes on
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The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and
operate it using more force than usual.
5-2. Steps to take in an emergency
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