Lexus NX450h+ 2022 Owner's Manual, Quick Manual page 105

What to do if...
If the hybrid system will not start
Make sure that the correct operating procedures have been followed.
Make sure that the brake pedal is firmly depressed when attempting to start the
hybrid system.
If the hybrid system still does not start, see the "OWNER'S MANUAL" for more
information or contact your Lexus dealer.
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