Lexus IS350 AWD Owner's Manual page 637

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. 132)
If you think something is wrong
The engine does not start
Did you press the engine switch while firmly depressing the brake pedal?
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(P. 186)
Is the shift lever in P? (P. 188)
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Is the electronic key anywhere detectable inside the vehicle? (P. 135)
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Is the steering wheel unlocked? (P. 188)
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Is the electronic key battery weak or depleted?
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In this case, the engine can be started in a temporary way. (P. 573)
Is the battery discharged? (P. 575)
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The shift lever cannot be shifted from P even if you depress the brake
pedal
Is the engine switch in IGNITION ON mode?
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If you cannot release the shift lever by depressing the brake pedal with the
engine switch in IGNITION ON mode. (P. 196)
The steering wheel cannot be turned after the engine is stopped
It is locked automatically to prevent theft of the vehicle. (P. 188)
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IS350 AWD/IS350/IS300 AWD/IS300_U
What to do if... (Troubleshooting)
637