2015 Lexus GS450h cruise control

GS450h_OM_OM30F70U_(U)
2734-5. Using the driving support systems
4
Driving
■Lane departure warning function
●When the vehicle speed is approximately 30 mph (48 km/h) or
more
●When the lane width is more than approximately 9.8 ft. (3.0 m)
●When driving on a straight road or through a curve with a radius of
more than approximately 394 ft. (120 m)
■Lane keeping assist function
●When the vehicle speed is between approximately 45 and 112 mph
(72 and 180 km/h)
●When the vehicle-to-vehicle distance mode of the radar cruise
control is on, and the set vehicl e speed is approximately 45 mph
(72 km/h) or more (the function will not operate when the radar
cruise control is in set speed mode)
●When the lane width is between approximately 9.8 and 13.1 ft.
(3.0 and 4.0 m)
●When driving on a straight road or through a curve with a radius of
more than approximately 656 ft. (200 m)
Operating conditions for each function

274
GS450h_OM_OM30F70U_(U)
4-5. Using the driving support systems
When the LKA system is on, the lane line display and steering wheel dis-
play are shown.Lane keeping assist function
operation indication
Steering wheel displayed:
Indicates that the function is currently
operating. (If the lane departure warn-
ing operates at this time, the steering
wheel flashes orange.)
Steering wheel not displayed:
Indicates that the function is not cur-
rently operating. (When the lane
keeping assist function is canceled,
the buzzer will beep twice.)
Dynamic radar cruise control dis-
play
Lane departure warning function
indication (when the inside of the
white line is white):
The function has recognized lane
markers. (If the lane departure warn-
ing operates at this time, the lines flash
orange.)
Lane departure warning function
indication (when the inside of the
white line is black):
A lane marker is not recognized by
the system, or the LKA system func-
tions are temporarily canceled.
Indication on the multi-information display
1
2
3
4

5157-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
7
When trouble arises
A buzzer sounds and a warning message is shown on the multi-informa-
tion display. Failure to investigate the cause of the following warnings may
lead to the system operating abnorma lly and possibly cause an accident.
Have the vehicle inspected by your Lexus dealer.
Have the vehicle inspected immediately.
Wa r n i n g m e s s a g eDetails
Indicates a malfunction in the pre-collision system
Indicates a malfunction in the intuitive parking assist All assist-sensors flash.
Indicates a malfunction in the dynamic radar cruise
control system (if equipped) or the cruise control sys-
tem Press the “ON/OFF” button once to deactivate the
system, and then press the button again to reacti-
vate the system.
(Flashes)
(If equipped)
(If equipped)

5167-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
Indicates a malfunction in the dynamic radar cruise
control with full-speed rangeDepress the brake pedal.
Indicates a malfunction in the LKA (Lane-Keeping
Assist)
Indicates a malfunction in the LED headlight system
Indicates a malfunction in the automatic headlight lev-
eling system
Wa r n i n g m e s s a g eDetails
(If equipped)
(If equipped)
(Flashes)
(If equipped)
(If equipped)

5257-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
7
When trouble arises
Wa r n i n g m e s s a g eDetailsCorrection procedure
Indicates that engine oil
level is lowCheck the level of engine
oil, and add if necessary.
Indicates that intuitive
parking assist sensor is
dirty or covered with ice
Clean the sensor.
Indicates that the radar
sensor is dirty or covered
with ice
Clean the sensor.
Indicates that the radar
cruise control system is
unable to judge vehicle-
to-vehicle distance
•Turn off the snowmode.
• If the windshield wip- ers are on, turn them
off or set them to a
mode other than
AUTO or high speed
wiper operation.
(If equipped)
(If equipped)
(If equipped)

5297-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
7
When trouble arises
■Warning message in radar cruise mode (if equipped)
In the following cases, the warning message may not be displayed even if vehicle-to-
vehicle distance decreases:
●When your vehicle and the vehicle ahead are traveling at the same speed or the
vehicle ahead is traveling more quickly than your vehicle
●When the vehicle ahead is traveling at a very low speed
●Immediately after cruise control speed is set
●At the instant the accelerator pedal is depressed
■The LKA (Lane-Keeping Assist) lane departure warning function (if equipped)
In the following cases, the warning message will not be displayed even if a lane line is
crossed.
●When the vehicle speed deviates from the operating range of the LKA system
functions
●When the lane lines cannot be recognized
●When the steering wheel is turned as far as necessary to cause the vehicle to
change lanes
■Open door warning message
The open door warning message continues to display until a door or the trunk is fully
closed, even if the power switch is turned off. However, approximately 20 minutes
after a door or the trunk is not fully closed, the 12-volt battery-saving function oper-
ates and the display turns off even though a door or the trunk is not fully closed.

5527-2. Steps to take in an emergency
GS450h_OM_OM30F70U_(U)
CAUTION
■When using the compact spare tire
●Remember that the compact spare tire provided is specifically designed for use
with your vehicle. Do not use your compact spare tire on another vehicle.
●Do not use more than one compact spare tire simultaneously.
●Replace the compact spare tire with a standard tire as soon as possible.
●Avoid sudden acceleration, abrupt steering, sudden braking and shifting opera-
tions that cause sudden engine braking.
■When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may
not operate correctly:
• ABS & Brake assist
•VSC
•TRAC
•Cruise control
• Dynamic radar cruise control (if equipped)
•PCS (if equipped)
•EPS
•AFS (if equipped) •AVS
• LKA (Lane-Keeping Assist)
(if equipped)
• Lexus parking assist monitor
•Intuitive parking as sist (if equipped)
• Navigation system (if equipped)
• DRS (if equipped)
• VGRS (if equipped)
•LDH (if equipped)

635Alphabetical index
GS450h_OM_OM30F70U_(U)
Approach warningDynamic radar cruise control......245
Dynamic radar cruise control with full-speed range ..................... 261
Armrest .................................................... 386
Ashtrays.....................................................377
Assist grips ................................................391
Audio input
*
Audio system*
Automatic headlight leveling system .................................................... 220
Automatic light control system......... 217
AUX port
*
Auxiliary boxes ...................................... 372
AVS (Adaptive Variable Suspension system).......................... 284
Back-up lights Replacing light bulbs ....................... 488
Wattage ................................................. 583
Battery (12-volt battery) .................... 439 If the 12-volt battery is discharged .........................................562
Preparing and checking before winter ..................................................... 318
Warning light ...................................... 504
Battery (traction battery) ......................76
Blind Spot Monitor (BSM)................300
Bluetooth
®*
Brake Brake Hold ............................................. 214
Fluid .......................................................... 437
Parking brake ..........................................211
Regenerative braking ..........................74
Warning light ..........................503, 506
Warning message...............................513
Brake assist ............................................. 283
Brake Hold................................................ 214
Break-in tips ............................................. 177
Brightness control Instrument panel light control ........ 93
BSM (Blind Spot Monitor) ............... 300 Blind Spot Monitor function.........304
Rear Cross Traffic Alert function................................................ 307
Care................................................. 408, 412 Aluminum wheels ..............................409
Exterior .................................................. 408
Interior ....................................................... 412
Seat belts.................................................. 413
Cargo capacity .......................................190
Cargo hooks ...........................................373
Caution label.............................................. 76
CD player
*
Chains ....................................................... 320
BC
*: Refer to the “NAVIGATION AND MULTIMEDIA SYSTEM OWNER’S MANUAL”.