Lexus RX450H Manual page 650

5-2. Steps to take in an emergency

Stopping the hybrid system
Shift the shift lever to P and press the "POWER" switch as you normally do
when stopping the hybrid system.

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. 515)

Alarm (if equipped)
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. 141)

Changing "POWER" switch modes
Within 10 seconds of the buzzer sounding, release the brake pedal and press
the "POWER" switch.
The hybrid system does not start and modes will be changed each time the
switch is pressed. (P. 201)
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