2013 Lexus GX460 stop start

336
2-4. Using other driving systems
GX460_OM_OM60J63U_(U)
DAC (Downhill Assist Control system)∗
∗: If equipped
The DAC helps to prevent excessive speed on steep downhill slopes.
The system will operate when the vehicle is traveling under 15 mph
(25 km/h) and the four-wheel drive cont rol switch is in the L4 position.
■System operation
Shift the “DAC” switch to ON.
The downhill assist control indi-
cator light comes on and the
system will operate.
When the system is in operation,
the slip indicator light will flash,
and the stop lights/high
mounted stop lights will be lit.
■Turning off the system
Shift the “DAC” switch to OFF while the system is in operation. The
downhill assist control indicator will flash as the system gradually
ceases operation, and will turn off when the system is fully off.
Shift the “DAC” switch to ON while the downhill assist control indi-
cator is flashing to start the system again.
GX460_OM_OM60J63U_(U).book Page 336 Thursday, March 29, 2012 9:10 AM

337
2-4. Using other driving systems
2
When driving
GX460_OM_OM60J63U_(U)
■Operating tips
The system will operate when the shift lever is in a position other than P, however to
make effective use of the system it is recommended that the shift lever be shifted to
2 or 1 range of S mode.
■If the four-wheel drive control switch is in H4
The system does not operate.
■When the downhill assist control system is operated continuously
This may cause the brake actuator to overheat. In this case, the downhill assist con-
trol system will stop operating, a buzzer will sound and the DAC indicator will start
flashing, and the TRAC OFF will be shown on the multi-information display. Refrain
from using the system until the DAC indicator stays on and the message goes off.
(The vehicle can be driven normally during this time.)
■Sounds and vibrations caused by the DAC
●A sound may be heard from the engine compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate that
a malfunction has occurred in DAC.
●Either of the following conditions may occur when the DAC is operating. None
of these are indicators that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■System malfunction
●The DAC indicator does not come on when the “ENGINE START STOP”
switch is turned to IGNITION ON mode.
●The “DAC” indicator does not come on when the “DAC” switch is pressed.
●The slip indicator comes on.
In the above cases, have your vehicle checked by your Lexus dealer.
GX460_OM_OM60J63U_(U).book Page 337 Thursday, March 29, 2012 9:10 AM

341
2-4. Using other driving systems
2
When driving
GX460_OM_OM60J63U_(U)
When the VSC/TRAC or Active TRAC/hill-start assist control systems
are operating
If the vehicle is in danger of slip-
ping or rolling backward when
starting on an incline, or if any of
the drive wheels spins, the slip indi-
cator light flashes to indicate that
the VSC/TRAC or Active TRAC/
hill-start assist control systems are
operating.
A buzzer (intermittent) sounds to
indicate that VSC is operating.
The stop lights and high mounted
stoplight turn on when the hill-start
assist control system is operating.
GX460_OM_OM60J63U_(U).book Page 341 Thursday, March 29, 2012 9:10 AM

343
2-4. Using other driving systems
2
When driving
GX460_OM_OM60J63U_(U)
■When the TRAC OFF is displayed on the multi-information display even if the
VSC OFF switch has not been pressed
TRAC/Active TRAC, hill-start assist control, downhill assist control and Crawl
Control cannot be operated. Contact your Lexus dealer.
■Hill-start assist control operation conditions
●The shift lever is in D or S.
●The brake pedal is not depressed.
■Sounds and vibrations caused by the ABS/Multi Terrain ABS, brake assist, VSC,
TRAC/Active TRAC and hill-start assist control systems
●A sound may be heard from the engine compartment when the engine is
started or just after the vehicle begins to move. This sound does not indicate that
a malfunction has occurred in any of these systems.
●Any of the following conditions may occur when the above systems are operat-
ing. None of these indicates that a malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
• The brake pedal may pulsate slightly after the ABS/Multi Terrain ABS is acti-vated.
• The brake pedal may move down slightly after the ABS/Multi Terrain ABS is
activated.
■Reactivation of the TRAC or Active TRAC/VSC systems after turning off the
engine
Turning off the engine after turning off the TRAC or Active TRAC/VSC systems
will automatically reactivate them.
■Reactivation of the TRAC or Active TRAC system linked to vehicle speed
When only the TRAC or Active TRAC system is turned off, the TRAC or Active
TRAC system will turn on when vehicle speed increases. However, when both
TRAC or Active TRAC and VSC systems are turned off, the systems will not turn on
even when vehicle speed increases.
GX460_OM_OM60J63U_(U).book Page 343 Thursday, March 29, 2012 9:10 AM

344
2-4. Using other driving systems
GX460_OM_OM60J63U_(U)
■When the brake system operates continuously
The brake actuator may overheat. In this case, the TRAC or Active TRAC and hill-
start assist control systems will stop operating, a buzzer will sound and the TRAC
OFF will be shown on the multi-information display. Refrain from using the system
until the message goes off. (There is no problem with continuing normal driving.)
■If the slip indicator comes on...
It may indicate a malfunction in the VSC, TRAC/Active TRAC or hill-start assist
control system. Consult your Lexus dealer.
CAUTION
■The ABS/Multi Terrain ABS does not operate effectively when
●Tires with inadequate gripping ability are used (such as excessively worn tires on
a snow covered road).
●The vehicle hydroplanes while driving at high speed on wet or slick roads.
■Stopping distance when the ABS/Multi Terrain ABS is operating may exceed
that of normal conditions
The ABS/Multi Terrain ABS is not designed to shorten the vehicle’s stopping dis-
tance. Always maintain a safe distance from the vehicle in front of you in the follow-
ing situations:
●When driving on dirt, gravel or snow-covered roads
●When driving with tire chains
●When driving over bumps in the road
●When driving over roads with potholes or roads with uneven surfaces
GX460_OM_OM60J63U_(U).book Page 344 Thursday, March 29, 2012 9:10 AM

368
2-5. Driving information
GX460_OM_OM60J63U_(U)
CAUTION
■Capacity and distribution
●Do not exceed the maximum axle weight rating or the total vehicle weight rating.
●Even if the total load of occupant’s weight and the cargo load is less than the total
load capacity, do not apply the load unevenly. Improper loading may cause dete-
rioration of steering or braking control which may cause death or serious injury.
■When loading cargo
Observe the following precautions:
●Place the cargo so that its weight is distributed evenly between the front and rear
axles.
●If loading long or wide cargo, never exceed the vehicle overall length or width.
(→ P. 7 5 8 )
●Before driving, make sure the cargo is securely fastened to the roof luggage car-
rier.
●Loading cargo on the roof luggage carrier will make the center of gravity of the
vehicle higher. Avoid high speeds, sudden starts, sharp turns, sudden braking or
abrupt maneuvers, otherwise it may result in loss of control or vehicle rollover
due to failure to operate this vehicle correctly and result in death or serious injury.
●If driving for a long distance, on rough roads, or at high speeds, stop the vehicle
now and then during the trip to make sure the cargo remains in its place.
●Do not exceed 176lb. (80 kg) cargo weight on the roof luggage carrier.
NOTICE
■When loading cargo
Be careful not to scratch the surface of the moon roof.
GX460_OM_OM60J63U_(U).book Page 368 Thursday, March 29, 2012 9:10 AM

385
2-5. Driving information
2
When driving
GX460_OM_OM60J63U_(U)
Connecting and disconnecting a trailerStop your vehicle and a trailer in line and perform the following:
● Connecting a trailer
Set the rear height control air suspension to N mode.
Turn off the “ENGINE START STOP” switch or the rear height
control air suspension.
Connect the trailer.
Turn on the switch that was turned off on .
● Disconnecting a trailer
Set the rear height control air suspension to N mode.
Turn off the rear height control air suspension.
Turn off the “ENGINE START STOP” switch.
Set the supporting leg of the trailer on the ground and raise the
hitch by 4 in. (100 mm)
Turn on the “ENGINE START STOP” switch.
Turn on the rear height control air suspension.
Wait until vehicle height is stabilized.
Make sure the hitch is disconnected. If the hitch does not disconnect,
raise the hitch higher and repeat steps 2 through 7.
STEP1STEP1
STEP2STEP2
STEP1STEP3STEP3
STEP1STEP4STEP4STEP2STEP2
STEP1STEP1
STEP2STEP2
STEP1STEP3STEP3
STEP1STEP4STEP4
STEP1STEP5STEP5STEP5
STEP1STEP5STEP6STEP6STEP6
STEP1STEP5STEP6STEP7STEP7
GX460_OM_OM60J63U_(U).book Page 385 Thursday, March 29, 2012 9:10 AM

386
2-5. Driving information
GX460_OM_OM60J63U_(U)
Trailer towing tipsYour vehicle will handle differently when towing a trailer. Help to avoid an
accident, death or serious injury, keep the following in mind when towing:
● Speed limits for towing a trailer vary by state or province. Do not
exceed the posted towing speed limit.
● Lexus recommends that the vehicle- trailer speed limit is 65 mph (104
km/h) on a flat, straight, dry road. Do not exceed this limit, the posted
towing speed limit or the speed limit for your trailer as set forth in your
trailer owner’s manual, whichever is lowest. Instability of the towing
vehicle-trailer combination (trailer sway) increases as speed increases.
Exceeding speed limits may cause loss of control.
● Before starting out, check the trailer lights, tires and the vehicle-trailer
connections. Recheck after driving a short distance.
● Practice turning, stopping and reversing with the trailer attached in an
area away from traffic until you become accustomed to the feel of the
vehicle-trailer combination.
● Reversing with a trailer attached is difficult and requires practice. Grip
the bottom of the steering wheel and move your hand to the left to
move the trailer to the left. Move your hand to the right to move the
trailer to the right. (This is generally opposite to reversing without a
trailer attached.) Avoid sharp or prolonged turning. Have someone
guide you when reversing to reduce the risk of an accident.
● As stopping distance is increased when towing a trailer, vehicle-to-
vehicle distance should be increased. For each 10 mph (16 km/h) of
speed, allow at least one vehicle and trailer length.
● Avoid sudden braking as you may skid, resulting in the trailer jackknif-
ing and loss of vehicle control. This is especially true on wet or slippery
surfaces.
GX460_OM_OM60J63U_(U).book Page 386 Thursday, March 29, 2012 9:10 AM