Lexus GS450h Owner's Manual page 579

The trunk lid is closed with the electronic key left inside
The function to prevent the electronic key from being left inside the trunk will
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operate and you can open the trunk as usual. Take the key out from the trunk.
(P. 148)
If you think something is wrong
The hybrid system does not start
Did you press the power switch while firmly depressing the brake pedal?
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(P. 217)
Is the shift lever in P? (P. 219)
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Is the electronic key anywhere detectable inside the vehicle? (P. 153)
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Is the steering wheel unlocked? (P. 219)
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Is the electronic key battery weak or depleted?
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In this case, the hybrid system can be started in a temporary way. (P. 528)
Is the 12-volt battery discharged? (P. 530)
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The shift lever cannot be shifted from P even if you depress the brake
pedal
Is the power switch in ON mode?
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If you cannot release the shift lever by depressing the brake pedal with the
power switch in ON mode (P. 229)
The steering wheel cannot be turned after the hybrid system is stopped
It is locked automatically to prevent theft of the vehicle. (P. 219)
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GS450h_300h_OM_OM30F92E_(EE)
What to do if... (Troubleshooting)
579