Lexus GS430 User Manual page 381

STARTING THE ENGINE WHEN THE ELECTRONIC KEY
BATTERY IS DISCHARGED
If the electronic key battery is discharged, the engine can
be started using the following procedure.
5. Unlock the door with the mechanical key and bring the
electronic key into the vehicle.
G11038
6. While the brake pedal is depressed, hold the ornament side
of the electronic key about 10 mm (0.4 in.) over the engine
switch as shown.
7. Within 5 seconds of the chime sounding, push the engine
switch with the brake pedal depressed to start the engine.
When you push the engine switch with the brake pedal not
depressed at this time, the engine will not start, but it is possible
to select "ACC", "IG−ON" and "OFF" mode.
If it is not possible to start the engine or change the mode using
this procedure, contact your Lexus dealer.
STARTING AND DRIVING
In addition, we recommend that the electronic key battery be
changed as soon as possible.
Stopping the engine
G31036
If you press the engine switch while the selector lever is
in "P" and the engine is running, regardless of brake pedal
position, the engine will be turned off.
With the transmission not in "P", the engine switch is selected
in "ACC" mode.
If, in an emergency, you must turn the engine off while the
vehicle is moving, press the engine switch for more than 3
seconds. At this time, "ACC" mode is selected.
Several hours after the engine is turned off, you may hear a
sound coming from underneath the luggage compartment for
several minutes. This is normal operation and does not
indicate a malfunction. (See page vi.)
357