2012 Lexus GS250 parking brake

2084-2. Driving procedures
GS350/250_EE (OM30C36E)Stop the vehicle.
Shift the shift lever to P.
Set the parking brake. (P. 225)
Press the engine switch.
Release the brake pedal and check that “POWER ON” on the
multi-information display is off.
Modes can be changed by pressing the engine switch with brake
pedal released. (The mode changes each time the switch is
pressed.)
Off*
The emergency flashers can be
used.
The multi-information display will
not be displayed.
ACCESSORY mode
Some electrical components such
as the audio system can be used.
“POWER ON” will be displayed
on the multi-information display.
IGNITION ON mode
All electrical components can be
used.
“POWER ON” will be displayed
on the multi-information display.
*: If the shift lever is in a position
other than P when turning off the
engine, the engine switch will be
Stopping the engine
Changing engine switch modes
1
2
3
4
5

2104-2. Driving procedures
GS350/250_EE (OM30C36E)If the engine is stopped with the shift lever in a position other than
P, the engine switch will not be turned off but instead be turned to
ACCESSORY mode. Perform the following procedure to turn the
switch off:
Check that the parking brake is set.
Shift the shift lever to P.
Check that “POWER ON” and “Turn Power OFF” are displayed
alternately on the multi-information display and then press the
engine switch once.
Check that “POWER ON” and “Turn Power OFF” on the multi-
information display are off.
When stopping the engine with the shift lever in a position
other than P
1
2
3
4

2254-2. Driving procedures
4
Driving
GS350/250_EE (OM30C36E)
Parking brake
Sets the parking brake
The parking brake indicator light
will come on. (P. 226)
Press and hold the parking brake
switch if an emergency occurs and
it is necessary to operate the park-
ing brake while driving.
Releases the parking brake
Operate the parking brake switch
while depressing the brake pedal.
Make sure that the parking brake
indicator light goes off.
A selections can be made as desired from the following modes.
Manual mode
1
2

2264-2. Driving procedures
GS350/250_EE (OM30C36E)The parking brake is set or released automatically according to shift
lever operation.
Turns automatic mode on/off
When the shift lever is moved
out of P, the parking brake will
be released.
When the shift lever is moved
into P, the parking brake will
be set.
Operate the shift lever with the
brake pedal depressed.
Parking brake operation
When the engine switch is not in IGNITION ON mode, the parking brake
cannot be released using the parking brake switch.
When the engine switch is not in IGNITION ON mode, automatic mode
(automatic brake setting and releasing) is not available.
If the parking brake is operated repeatedly over a short period of time, the
system may restrict operation to prevent overheating. If this happens,
refrain from operating the parking brake. Normal operation will return after
about 1 minute.
Parking brake operation sound
When the parking brake operates, a motor sound (whirring sound) may be
heard. This does not indicate a malfunction.
Parking brake indicator light
Depending on the engine switch mode, the parking brake indicator light
will come on and stay on as described below:
IGNITION ON mode: Comes on until the parking brake is released.
Not in IGNITION ON mode: Stays on for approximately 15 seconds.
When the engine switch is turned off with the parking brake set, the parking
brake indicator light will stay on for about 15 seconds. This does not indi-
cate a malfunction.
Automatic mode

227
4 4-2. Driving procedures
Driving
GS350/250_EE (OM30C36E)
When there is a malfunction in the system
Warning lights and/or warning message will turn on or flash. (P. 749, 757)
Depending on the condition, the parking brake indicator light may flash.
Usage in winter time
P. 3 5 9
NOTICE
When parking the vehicle
Before you leave the vehicle, set the parking brake, shift the shift lever to P
and make sure that the vehicle does not move.
When the system malfunctions
Stop the vehicle in a safe place and check the warning messages.
When the parking brake cannot be released due to a malfunction
Use the parking brake release tool to manually release the parking brake.
(P. 818)
Driving the vehicle with the parking brake set will lead to brake compo-
nents overheating, which may affect braking performance and increase
brake wear.

2314-3. Operating the lights and wipers
4
Driving
GS350/250_EE (OM30C36E)
Daytime running light system
To make your vehicle more visible to other drivers, the front position lights
turn on automatically whenever the engine is started and the parking brake is
released. Daytime running lights are not designed for use at night.
Headlight control sensor
Automatic light off system
When the light switch is in : The headlights turn off automatically if the
engine switch is turned to ACCESSORY mode or turned off.
When the light switch is in : The headlights and all lights turn off auto-
matically if the engine switch is turned to ACCESSORY mode or turned
off.
To turn the lights on again, turn the engine switch to IGNITION ON mode,
or turn the light switch off once and then back to or .
If any of the doors or trunk lid is kept open, the lights automatically turn off
after 20 minutes.
Light reminder buzzer
A buzzer sounds when the engine switch is turned off or turned to ACCES-
SORY mode and the driver’s door is opened while the lights are turned on.
Automatic headlight leveling system
The level of the headlights is automatically adjusted according to the number
of passengers and the loading condition of the vehicle to ensure that the
headlights do not interfere with other road users. The sensor may not function properly if
an object is placed on the sensor, or any-
thing that blocks the sensor is affixed to
the windshield.
Doing so interferes with the sensor
detecting the level of ambient light and
may cause the automatic headlight system
to malfunction.

2944-5. Using the driving support
GS350/250_EE (OM30C36E)
Lexus parking assist-sensor display
When an obstacle is detected while the rear view monitor system, is in use,
the warning indicator will appear in the top right of the screen even if the dis-
play setting has been set to off.
Sensor detection information
The sensor’s detection areas are limited to the areas around the vehicle’s
front corner and rear bumpers.
Certain vehicle conditions and the surrounding environment may affect the
ability of the sensor to correctly detect obstacles. Particular instances where
this may occur are listed below.
• There is dirt, snow or ice on the sensor. (Wiping the sensors will resolve
this problem.)
• The sensor is frozen. (Thawing the area will resolve this problem.)
In especially cold weather, if a sensor is frozen the screen may show an
abnormal display, or obstacles may not be detected.
• The sensor is covered in any way.
• The vehicle is leaning considerably to one side.
• On an extremely bumpy road, on an incline, on gravel, or on grass.
• The vicinity of the vehicle is noisy due to vehicle horns, motorcycle
engines, air brakes of large vehicles, or other loud noises producing
ultrasonic waves.
• There is another vehicle equipped with parking assist sensors in the
vicinity.
• The sensor is coated with a sheet of spray or heavy rain.
• The vehicle is equipped with a fender pole or wireless antenna.
• Towing eyelets are installed.
• The bumper or sensor receives a strong impact.
• The vehicle is approaching a tall or curved curb.
• In harsh sunlight or intense cold weather.
• The area directly under the bumpers is not detected.
• If obstacles draw too close to the sensor.
• A non-genuine Lexus suspension (lowered suspension etc.) is installed.
• People may not be detected if they are wearing certain types of clothing.
In addition to the examples above, there are instances in which, because of
their shape, signs and other objects may be judged by the sensor to be closer
than they are.

2964-5. Using the driving support
GS350/250_EE (OM30C36E)
CAUTION
When using the Lexus parking assist-sensor
Observe the following precautions.
Failing to do so may result in the vehicle being unable to be driven safely
and possibly cause an accident.
Do not use the sensor at speeds in excess of 10 km/h (6 mph).
The sensors’ detection areas and reaction times are limited. When moving
forward or reversing, check the areas surrounding the vehicle (especially
the sides of the vehicle) for safety, and drive slowly, using the brake to
control the vehicle’s speed.
Do not install accessories within the sensors’ detection areas.
NOTICE
When using Lexus parking assist-sensor
In the following situations, the system may not function correctly due to a
sensor malfunction etc. Have the vehicle checked by any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional.
The Lexus parking assist-sensor operation display flashes, and a beep
sounds when no obstacles are detected.
If the area around a sensor collides with something, or is subjected to
strong impact.
If the bumper collides with something.
If the display shows continuously without a beep.
If a display error occurs, first check the sensor.
If the error occurs even if there is no ice, snow or mud on the sensor, it is
likely that the sensor is malfunctioning.
Notes when washing the vehicle
Do not apply intensive bursts of water or steam to the sensor area.
Doing so may result in the sensor malfunctioning.