Lexus LS460 2011 Owner's Manual page 773

5-2. Steps to take in an emergency

Stopping the engine
Shift the shift lever to "P" and press the "ENGINE START STOP" switch as
you normally do when stopping the engine.

Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the
electronic key battery be replaced immediately when the battery is depleted.
(P. 661)

Alarm
Using the mechanical key to lock the doors will not set the alarm system.
If a door is unlocked using the mechanical key when the alarm system is set,
the alarm may be triggered. (P. 124)
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