2011 INFINITI QX sensor

NOTE:
If you continue to push the warning systems
switch from off to on for over 4 seconds, a chime
will sound. This will change the default status of
the LDW, BSW and FCW systems to OFF so that
these systems will not automatically turn on
when the engine is started. If this procedure is
repeated, the default status will return to ON.
For the sensor maintenance, see “Sensor main-
tenance” earlier in this section.
FCW system operation (Type B)
The warning systems switch is used to turn on
and off the FCW system when it is activated
using the settings menu on the center display.
See “How to enable/disable the FCW system
using the settings menu” later in this section.
When the warning systems switch is turned off,
the indicator
1on the switch is off. The
indicator will also be off if the FCW, the Lane
Departure Warning (LDW) and the Blind Spot
Warning (BSW) systems are deactivated. For the LDW and BSW systems, see “LANE
DEPARTURE WARNING (LDW)/PREVENTION (LDP)
SYSTEM” earlier in this section and “BLIND
SPOT WARNING (BSW) SYSTEM” earlier in this
section.
For the sensor maintenance, see “INTELLIGENT
CRUISE CONTROL (ICC) SYSTEM” earlier in this
section.
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5-78Starting and driving

The Intelligent Brake Assist (IBA) system warns
the driver by a warning light and chime when
there is a risk of a collision with the vehicle
ahead in the traveling lane and the driver must
take avoidance action immediately. The system
helps reduce the rear-end collision speed by
applying the brakes when the system judges
that the collision cannot be prevented.
The IBA system will function when your vehicle
is driven at speeds of approximately 10 MPH (15
km/h) and above, and when your vehicle is
driven at speeds approximately 10 MPH (15
km/h) faster than the vehicle ahead.The IBA system uses a distance sensorA
located below the front bumper to measure the
distance to the vehicle ahead. When the system
judges that your vehicle is getting close to the
vehicle ahead in the traveling lane, the vehicle
ahead detection indicator on the instrument
panel blinks and a warning chime sounds.
The IBA system will be turned on/off by pushing
the IBA OFF switch. The IBA OFF indicator light
will illuminate when the system is turned off.
PRECAUTIONS ON IBA SYSTEM
WARNING
●
The IBA system is not a collision avoidance
system. It is the driver’s responsibility to
stay alert, drive safely and be in control of
the vehicle at all times.
● As there is a performance limit, the system
may not provide a warning or braking in cer-
tain conditions.
● The system will not detect the following
objects:
– Pedestrians, animals or obstacles in the roadway
SSD1047
Vehicle ahead detection indicator
SSD0749
INTELLIGENT BRAKE ASSIST (IBA) SYSTEM
(if so equipped)
5-80Starting and driving

– Motorcycles traveling offset in the travel-ing lane
– Oncoming vehicles in the same lane
● The system will not detect another vehicle
under the following conditions:
– When the sensor gets dirty and it is im- possible to detect the distance from the
vehicle ahead.
– When driving into a strong light (i.e., sunlight)
● The sensor generally detects the signals re-
turned from the reflectors on a vehicle
ahead. Therefore, the system may not func-
tion properly under the following conditions:
– When the reflectors of the vehicle ahead are positioned high or close to each other
(including a small vehicle such as
motorcycles).
– When the sensor gets dirty and it is im- possible to detect the distance from the
vehicle ahead.
– When the reflectors on the vehicle ahead are missing, damaged or covered.
– When the reflectors of the vehicle ahead are covered with dirt, snow or road spray. – When visibility is low (such as rain, fog,
snow, etc.).
– When snow or road spray from traveling vehicles is splashed.
– When dense exhaust or other smoke (black smoke) from vehicles reduces the
visibility of the sensor.
– When excessively heavy baggage is loaded in the rear seat or the luggage
room of your vehicle.
– When abruptly accelerating or decelerating.
– On a steep downhill slope or on roads with sharp curves.
– When there is a highly reflective object near the vehicle ahead (i.e., being very
close to another vehicle, signboard, etc.)
– When towing a trailer or other vehicle.
● Depending on certain road conditions
(curved or beginning of a curve), vehicle con-
ditions (steering position or vehicle posi-
tion), or the preceding vehicle’s conditions
(position in lane, etc.), the system may not
function properly.
● The system may not function in offset
conditions. ●
The system may not function when the dis-
tance to the vehicle ahead is extremely
close.
Starting and driving5-81

WARNING
●The system may detect highly reflective ob-
jects such as reflectors, signs, white mark-
ers and other stationary objects on the road
or near the traveling lane.
In extreme conditions, detection of these ob-
jects may cause the system to function.
● The system is designed to automatically
check the sensor’s functionality. If the sen-
sor is covered with ice, a transparent or
translucent plastic bag, etc., the system may not detect them. In these instances the sys-
tem may not be able to warn the driver prop-
erly. Be sure to check and clean the sensor
regularly.
● Excessive noise will interfere with the warn-
ing chime sound, and the chime may not be
heard.
● A sudden appearance of a vehicle in front
(i.e., it abruptly cuts in) may not be detected
and the system may not warn the driver soon
enough.
● The system will be cancelled automatically
with a beep sound and the IBA warning light
will illuminate under the following
conditions:
– When the sensor window is dirty
– When the system malfunctions
If the IBA OFF indicator light illuminates with a
beep sound, pull off the road to a safe location,
stop the vehicle and turn the engine off. Check
to see if the sensor window is dirty. If the
sensor window is dirty, clean it with a soft cloth
and restart the engine. If the sensor window is
not dirty, restart the engine. If the IBA OFF
indicator light continues to illuminate even if
the IBA system is turned on, have the system
checked by an INFINITI retailer.
IBA system operation
The IBA system will function when your vehicle
is driven at speeds of approximately 10 MPH (15
km/h) or above, and when the vehicle’s speed
is approximately 10 MPH (15 km/h) faster than
that of the vehicle ahead.
To turn the system off or on, push and hold the
IBA OFF switch
B(located on the lower side of
the instrument panel) for more than 1 second
after starting the engine. When the IBA OFF
indicator light
Aon the instrument panel turns
off and the IBA OFF switch is pushed, the
system will turn off and the IBA OFF indicator
light will illuminate. When the IBA OFF switch is
pushed again, the system will turn on and the
IBA OFF indicator light will turn off.
Reflectors on the road
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5-82Starting and driving

The IBA system will remain in the last ON or OFF
state it was left in until it is manually changed
by pressing the IBA OFF switch.
Illumination of the IBA OFF indicator light with-
out a beep sound is an indication that the IBA
system is temporarily unavailable. It will occur
under the following conditions:
– When driving into a strong light (for example,sunlight)
– When the 4WD shift switch is in the 4H or 4L position (for 4WD models)
The IBA OFF indicator light will turn off when the
system returns to its normal operating condi-
tions.
For the sensor maintenance, see “Sensor main-
tenance” earlier in this section.CAUTION
During the first 1,200 miles (2,000 km), follow
these recommendations to obtain maximum
engine performance and ensure the future reli-
ability and economy of your new vehicle.
Failure to follow these recommendations may
result in shortened engine life and reduced en-
gine performance.
● Avoid driving for long periods at constant
speed, either fast or slow. Do not run the
engine over 4,000 rpm.
● Do not accelerate at full throttle in any gear.
● Avoid quick starts.
● Avoid hard braking as much as possible.
● Do not tow a trailer for the first 500 miles
(805 km). ●
Accelerate slowly and smoothly. Maintain
cruising speeds with a constant accelerator
position.
● Drive at moderate speeds on the highway.
● Avoid unnecessary stopping and braking.
Keep a safe distance behind other vehicles.
● Select a gear range suitable to road condi-
tions.
● Avoid unnecessary prolonged engine idling.
● Keep your engine tuned up.
● Follow the recommended periodic mainte-
nance schedule.
● Keep the tires inflated at the correct pres-
sure. Improper tire pressure will increase
wear and waste fuel.
● Make sure the front wheels are properly
aligned. Improper alignment will cause pre-
mature tire wear and lower fuel economy.
● Climate control operation lowers fuel
economy. Use the air conditioner only when
necessary.
● When cruising at highway speeds, it is more
economical to use the air conditioner and
leave the windows closed to reduce drag.
BREAK-IN SCHEDULE INCREASING FUEL ECONOMY
Starting and driving5-83

●The sensor will not detect:
a) Pedestrians or objects in the roadway
b) Oncoming vehicles in the same lane
c) Motorcycles traveling offset in the travel lane as illustrated
WARNING
●This system is only an aid to assist braking
operation and is not a collision warning or
avoidance device. It is the driver’s responsi-
bility to stay alert, drive safely and be in
control of the vehicle at all times. ●
As there is a performance limit to the Pre-
view Function, never rely solely on this sys-
tem. This system does not correct careless
inattentive or absent-minded driving, or
overcome poor visibility in rain, fog, or other
bad weather. Reduce vehicle speed by de-
pressing the brake pedal, in order to main-
tain a safe distance between vehicles.
● The system may not detect the vehicle in
front of you in certain road or weather condi-
tions. The Preview Function may not operate
properly under the following conditions. The
vehicle is still driveable under normal condi-
tions and the Brake Assist will operate.
– When rain, snow or dirt adhere to the sys- tem sensor
– When strong light (for example, at sun- rise or sunset) is directly shining on the
front of the vehicle
– Winding or hilly roads may cause the sen- sor to temporarily not detect a vehicle in
the same lane or may detect objects or
vehicles in other lanes.
– Vehicle position in the lane may cause the sensor to temporarily not detect a vehicle
in the same lane or may detect objects or
vehicles in other lanes. ●
When the Preview Function operates, the
brake pedal may move slightly and may
make a small noise. This is not a system
malfunction.
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5-96Starting and driving

Warning light and display
When the Preview Function is not operating
properly, the chime sounds and the system
warning light (orange) will come on.
Action to take :
If the warning light comes on, park the vehicle
in a safe place. Turn the engine off, restart the
engine and resume driving.
If the indicator stays on, it may indicate that the
Preview Function is malfunctioning (the brake is
operative). Although the Vehicle is still drive-
able under normal conditions, have the vehicle
checked at an INFINITI retailer.
How to handle the sensor
The sensor for the Preview Function is common
with Intelligent Cruise Control and is located
below the front bumper.
To keep the Preview Function operating prop-
erly, be sure to observe the following:
●Always keep the sensor clean. Wipe with a
soft cloth carefully so as not to damage the
sensor.
● Do not strike or damage the areas around
the sensor. Do not touch or remove the
screw located on the sensor. Doing so could
cause failure or malfunction. If the sensor is
damaged due to an accident, contact an
INFINITI retailer.
● Do not attach a sticker (including transpar-
ent material) or install an accessory near the
sensor. This could cause failure or malfunc-
tion.
ANTI-LOCK BRAKING SYSTEM (ABS)
WARNING
● The Anti-lock Braking System (ABS) is a so-
phisticated device, but it cannot prevent ac-
cidents resulting from careless or dangerous
driving techniques. It can help maintain ve-
hicle control during braking on slippery sur-
faces. Remember that stopping distances on
slippery surfaces will be longer than on nor-
mal surfaces even with ABS. Stopping dis-
tances may also be longer on rough, gravel
or snow covered roads, or if you are using
tire chains. Always maintain a safe distance
from the vehicle in front of you. Ultimately,
the driver is responsible for safety.
● Tire type and condition may also affect brak-
ing effectiveness.
– When replacing tires, install the specified size of tires on all four wheels.
–
When installing a spare tire, make sure that
it is the proper size and type as specified on
the Tire and Loading Information label. See
“TIRE AND LOADING INFORMATION LABEL”
in the “9. Technical and consumer informa-
tion” section of this manual.
– For detailed information, see “WHEELS AND TIRES” in the “8. Maintenance and
do-it-yourself” section of this manual.
SSD0471
Starting and driving5-97

The Anti-lock Braking System (ABS) controls the
brakes so the wheels do not lock during hard
braking or when braking on slippery surfaces.
The system detects the rotation speed at each
wheel and varies the brake fluid pressure to
prevent each wheel from locking and sliding. By
preventing each wheel from locking, the system
helps the driver maintain steering control and
helps to minimize swerving and spinning on
slippery surfaces.
Using the system
Depress the brake pedal and hold it down.
Depress the brake pedal with firm steady pres-
sure, but do not pump the brakes. The ABS will
operate to prevent the wheels from locking up.
Steer the vehicle to avoid obstacles.
WARNING
Do not pump the brake pedal. Doing so may
result in increased stopping distances.
Self-test feature
The ABS includes electronic sensors, electric
pumps, hydraulic solenoids and a computer.
The computer has a built-in diagnostic feature
that tests the system each time you start the
engine and move the vehicle at a low speed in
forward or reverse. When the self-test occurs,you may hear a “clunk” noise and/or feel a
pulsation in the brake pedal. This is normal and
does not indicate a malfunction. If the computer
senses a malfunction, it switches the ABS off
and illuminates the ABS warning light on the
instrument panel. The brake system then oper-
ates normally, but without anti-lock assistance.
If the ABS warning light illuminates during the
self-test or while driving, have the vehicle
checked by an INFINITI retailer.
Normal operation
The ABS operates at speeds above 3 to 6 MPH
(5 to 10 km/h). The speed varies according to
road conditions.
When the ABS senses that one or more wheels
are close to locking up, the actuator rapidly
applies and releases hydraulic pressure. This
action is similar to pumping the brakes very
quickly. You may feel a pulsation in the brake
pedal and hear a noise from under the hood or
feel a vibration from the actuator when it is
operating. This is normal and indicates that the
ABS is operating properly. However, the pulsa-
tion may indicate that road conditions are haz-
ardous and extra care is required while driving.
The Vehicle Dynamic Control (VDC) system uses
various sensors to monitor driver inputs and
vehicle motion. Under certain driving condi-
tions, the VDC system helps to perform the
following functions.
●
Controls brake pressure to reduce wheel slip
on one slipping drive wheel so power is
transferred to a non slipping drive wheel on
the same axle.
● Controls brake pressure and engine output
to reduce drive wheel slip based on vehicle
speed (traction control function).
● Controls brake pressure at individual wheels
and engine output to help the driver main-
tain control of the vehicle in the following
conditions:
– understeer (vehicle tends to not follow the steered path despite increased steer-
ing input)
– oversteer (vehicle tends to spin due to certain road or driving conditions).
The VDC system can help the driver to maintain
control of the vehicle, but it cannot prevent loss
of vehicle control in all driving situations.
VEHICLE DYNAMIC CONTROL (VDC)
SYSTEM
5-98Starting and driving