brakes Lexus GS450h 2015 Opening, closing and locking the doors and trunk / LEXUS 2015 GS450H FROM MAR. 2015 PROD. (OM30F70U) Owner's Manual

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GS450h_OM_OM30F70U_(U)
4-5. Using the driving support systems
PCS (Pre-Collision System)
◆Pre-collision seat belts (front seat only)
If the pre-collision sensor detects that a collision is unavoidable, the
pre-collision system will retract the seat belt before the collision occurs.
The same will happen if the dr iver makes an emergency braking or
loses control of the vehicle. ( P. 3 4 )
◆Pre-collision brake assist
When there is a high possibility of a frontal collision, the system applies
greater braking force in relation to how strongly the brake pedal is
depressed.
◆Pre-collision braking
When there is a high poss ibility of a frontal collision, the system warns
the driver using a warning light, war ning display and buzzer. If the sys-
tem determines that a collision is unavoidable, the brakes are automati-
cally applied to reduce the collision speed.

: If equipped
When the radar sensor detects the possibility of a frontal collision, the
pre-collision system such as the brakes and seat belts are automatically
engaged to lessen impact as well as vehicle damage.
The pre-collision system ca n be turned on and off as necessary by oper-
ating the switch. ( P. 2 9 2 )

GS450h_OM_OM30F70U_(U)
2954-5. Using the driving support systems
4
Driving
■Conditions that may trigger the system even if there is no danger of a collision
●When there is an object by the roadside at the entrance to a curve
●When passing an oncoming vehicle on a curve
●When driving over a narrow iron bridge
●When there is a metal object on the road surface
●When driving on an uneven road surface
●When passing an oncoming vehicle on a left-turn
●When your vehicle rapidly closes on the vehicle in front
●When a grade separation/interchange, sign , billboard, or other structure appears
to be directly in the vehicle’s line of travel
●When climbing a steep hill causes an overhead billboard or other metallic structure
to appear directly in the vehicle’s line of travel
When the system is activated in the situations described above, there is also a possi-
bility that the seat belts will retract quickly and the brakes will be applied with a force
greater than normal. When the seat belt is locked in the retracted position, stop the
vehicle in a safe place, release the seat belt and refasten it.
■Obstacles not detected
The sensor cannot detect plastic obstacles such as traffic cones. There may also be
occasions when the sensor cannot detect pedestrians, animals, bicycles, motorcy-
cles, trees, or snowdrifts.
■Situations in which the pre-collision system does not function properly
The system may not function effectively in situations such as the following:
●On roads with sharp bends or uneven surfaces
●If a vehicle suddenly moves in front of your vehicle, such as at an intersection
●If a vehicle suddenly cuts in front of your vehicle, such as when overtaking
●In inclement weather such as heavy rain, fog, snow or sand storms
●When your vehicle is skidding
●When your vehicle is steeply inclined
●When the radar sensor moves off position due to its surrounding area being sub-
jected to a strong impact

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GS450h_OM_OM30F70U_(U)
4-6. Driving tips
Hybrid vehicle driving tips
◆Using Eco drive mode
When using Eco drive mode, the torque corresponding to the acceler-
ator pedal depression amount can be generated more smoothly than it
is in normal conditions. In addition, the operatio n of the air conditioning
system (heating/cooling) will be mini mized, improving the fuel econ-
omy. ( P. 280)
◆Use of Hybrid System Indicator
The Eco-friendly driving is possible by keeping the indicate of Hybrid
System Indicator within Eco area. ( P. 9 4 )
◆When braking the vehicle
Make sure to operate the brakes gently and in good time. A greater
amount of electrical energy can be retained when slowing down.
◆Delays
Repeated acceleration and decelerati on, as well as long waits at traffic
lights, will lead to bad fuel consumption. Check traffic reports before
leaving and avoid delays as much as possible. When encountering a
delay, gently release the brake pedal to allow the vehicle to move for-
ward slightly while avoiding overuse of the accelerator pedal. Doing so
can help control excessive gasoline consumption.
◆Highway driving
Control your speed and keep at a constant speed. Also, before stop-
ping at a toll booth or similar, allow plenty of time to release the acceler-
ator and gently apply the brakes. A greater amount of electrical energy
can be retained when slowing down.
For economical and ecological drivin g, pay attention to the following
points:

GS450h_OM_OM30F70U_(U)
3194-6. Driving tips
4
Driving
Perform the following according to the driving conditions:
●Do not try to forcibly open a window or move a wiper that is frozen.
Pour warm water over the frozen area to melt the ice. Wipe away the
water immediately to prevent it from freezing.
●To ensure proper operation of the climate control system fan, remove
any snow that has accumulated on the air inlet vents in front of the wind-
shield.
●Check for and remove any excess ice or snow that may have accumu-
lated on the exterior lights, vehicle’s roof, chassis, around the tires or on
the brakes.
●Remove any snow or mud from the bo ttom of your shoes before getting
in the vehicle.
Accelerate the vehicle slowly, keep a safe distance between you and the
vehicle ahead, and drive at a reduced speed suitable to road conditions.
Park the vehicle and move the shift lever to P without setting the parking
brake. The parking brake may freeze up, preventing it from being
released. If necessary, block the wheels to prevent inadvertent sliding or
creeping.
Before driving the vehicle
When driving the vehicle
When parking the vehicle

GS450h_OM_OM30F70U_(U)
4196-2. Maintenance
6
Maintenance and care
Ve h i c l e i n t e r i o r
ItemsCheck points
Accelerator pedal
• The accelerator pedal should movesmoothly (without uneven pedal
effort or catching).
Hybrid transmission “Park” mechanism
• When parked on a slope and the shiftlever is in P, is the vehicle securely
stopped?
Brake pedal
• Does the brake pedal movesmoothly?
• Does the brake pedal have appropri- ate clearance from the floor? ( P. 5 8 1 )
• Does the brake pedal have the cor- rect amount of free play? ( P. 5 8 1 )
Brakes
• The vehicle should not pull to one
side when the brakes are applied.
• The brakes should work effectively.
• The brake pedal should not feel spongy.
• The brake pedal should not get too close to the floor when the brakes are
applied.

4987-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)If your vehicle is transported by a
flatbed truck, it should be tied down
at the locations shown in the illustra-
tion.
If you use chains or cables to tie
down your vehicle, the angles
shaded in black must be 45
.
Do not overly tighten the tie downs
or the vehicle may be damaged.
If a tow truck is not available in an emergency, y our vehicle may be tempo-
rarily towed using cables or chains secured to the emergency towing eye-
lets. This should only be attempted on hard surfaced roads for short
distances at under 3 mph (5 km/h).
A driver must be in the vehicle to steer and operate the brakes. The vehi-
cle’s wheels, drive train, axles, steeri ng and brakes must be in good condi-
tion.
Using a flatbed truck
Emergency towing

5007-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
■While towing
If the hybrid system is off, the power assist for the brakes and steering will not func-
tion, making steering and braking more difficult.
■Wheel nut wrench
Wheel nut wrench is installed in trunk. (P. 5 4 2 )
CAUTION
Observe the following precautions.
Failure to do so may result in death or serious injury.
■When towing the vehicle
■While towing
●When towing using cables or chains, avoid sudden starts, etc. which place exces-
sive stress on the towing eyelets, cables or chains. The towing eyelets, cables or
chains may become damaged, broken debris may hit people, and cause serious
damage.
●Do not turn the power switch off.
There is a possibility that the steering wheel is locked and cannot be operated.
■Installing towing eyelets to the vehicle
Make sure that towing eyelets are installed securely.
If not securely installed, towing eyelets may come loose during towing.
Be sure to transport the vehicle with all four
wheels raised off the ground. If the vehicle is
towed with the tires contacting the ground,
the drivetrain and related parts may be dam-
aged, an accident may occur due to a
change in direction of the vehicle or electric-
ity generated by the operation of the motor
may cause a fire to occur depending on the
nature of the damage or malfunction.

5107-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
CAUTION
■If both the ABS and the brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact your Lexus dealer. The
vehicle will become extremely unstable during braking, and the ABS system may
fail, which could cause an accident resulting in death or serious injury.
■When the electric power steering system warning light comes on
The steering wheel may become extremely heavy.
If the steering wheel becomes heavier than usual when operating, hold firmly and
operate using more force than usual.
■If the tire pressure warning light comes on
Be sure to observe the following precautions. Failure to do so could cause a loss of
vehicle control and result in death or serious injury.
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres-
sure immediately.
●If the tire pressure warning light comes on even after tire inflation pressure adjust-
ment, it is probable that you have a flat tire. Check the tires. If a tire is flat, change
it with the spare tire and have the flat tire repaired by the nearest Lexus dealer.
●Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could
lose control of the steering wheel or the brakes.
■If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.

5237-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
7
When trouble arises
Indicates that the brake
hold system is not avail-
ableThe reason the brake
hold system is not avail-
able may be displayed.• Close the driver’s door.
• Fasten the driver’s seatbelt.
• Close the trunk and hood.
Indicates that the brake
hold system is not avail-
ableThe reason the brake
hold system is not avail-
able may be displayed.•Depress the brakepedal.
• Close the driver’s door.
• Fasten the driver’s seat belt.
Indicates that the parking
brake is set automatically
while the brake hold sys-
tem is holding the brakes
Release the parking
brake.
Wa r n i n g m e s s a g eDetailsCorrection procedure
(Flashes)

5267-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
Indicates that your vehi-
cle is nearing the vehicle
ahead (in vehicle-to-vehi-
cle distance mode)At the same time,
will appear on
the head-up display
(the image flashes).
Slow the vehicle by
applying the brakes.
Indicates that there is a
high possibility of a frontal
collision, or that the pre-
collision braking function
is operating At the same time,
will appear
on the head-up dis-
play.
Slow the vehicle by
applying the brakes.
Indicates that the LKA
(Lane-Keeping Assist) is
suspended
•The camera sensor temperature is higher
than the operation tem-
perature range.
•The power steering system operation is
restricted.
Restart the LKA after
driving for a while.
Wa r n i n g m e s s a g eDetailsCorrection procedure
(If equipped)
(Flashes
rapidly)
(If equipped)
(If equipped)