2019 INFINITI QX50 brake sensor

This procedure is described in the INFINITI
Service Manual. It is recommended that you
visit an INFINITI retailer for this service.
ANTI-LOCK BRAKING SYSTEM
(ABS)
WARNING
∙ The ABS is a sophisticated device, but itcannot prevent accidents resulting from
careless or dangerous driving techniques.
It can help maintain vehicle control dur-
ing braking on slippery surfaces. Remem-
ber that stopping distances on slippery
surfaces will be longer than on normal
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 braking effectiveness.
– When replacing tires, install the speci- fied 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 In-
formation label. For additional infor-
mation, refer to “Tire and Loading In-
formation label” in the “Technical and
consumer information” section of this
manual.
– For additional information, refer to “Wheels and tires” in the “Do-it-
yourself” section of this manual.
The 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
pressure, but do not pump the brakes. The
Anti-lock Braking System will operate to pre-
vent 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 Anti-lock Braking System (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 op-
erates normally but without anti-lock assis-
tance.
If the ABS warning light illuminates during
the self-test or while driving, have the vehicle
checked. It is recommended that you visit an
INFINITI retailer for this service.
Normal operation
The Anti-lock Braking System (ABS) operates
at speeds above3-6mph(5-10km/h). The
speed varies according to road conditions.
5-180Starting and driving

When the ABS senses that one or more
wheels are close to locking up, the actuator
rapidly applies and releases hydraulic pres-
sure. 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 prop-
erly. However, the pulsation may indicate
that road conditions are hazardous and extra
care is required while driving.
BRAKE ASSIST
When the force applied to the brake pedal
exceeds a certain level, the Brake Assist is
activated generating greater braking force
than a conventional brake booster even with
light pedal force.
WARNING
The Brake Assist is only an aid to assist
braking operation and is not a collision
warning or avoidance device. It is the driv-
er’s responsibility to stay alert, drive safely
and be in control of the vehicle at all times.The VDC system uses various sensors to
monitor driver inputs and vehicle motion. Un-
der certain driving conditions, the VDC sys-
tem 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 out- put 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 maintain control of the vehicle in
the following conditions:
– Understeer (vehicle tends to not fol- low the steered path despite in-
creased steering input)
– Oversteer (vehicle tends to spin due to certain road or driving conditions)
The VDC system can help the driver to main-
tain control of the vehicle, but it cannot pre-
vent loss of vehicle control in all driving situ-
ations. When the VDC system operates, the
indicator in the instrument panel flashes to
note the following:
∙ The road may be slippery or the system may determine some action is required to
help keep the vehicle on the steered path.
∙ You may feel a pulsation in the brake pedal and hear a noise or vibration from
under the hood. This is normal and indi-
cates that the VDC system is working
properly.
∙ Adjust your speed and driving to the road conditions.
For additional information, refer to “Slip indi-
cator light” and ”Vehicle Dynamic Control
(VDC) OFF indicator light” in the ”Instruments
and controls” section of this manual.
If a malfunction occurs in the system,
the
andindicator lights come on
in the instrument panel. The VDC system au-
tomatically turns off when these indicator
lights are on.
The lower display is used to turn off the VDC
system. The
indicator illuminates to in-
dicate the VDC system is off.
VEHICLE DYNAMIC CONTROL (VDC)
SYSTEM
Starting and driving5-181

The chassis control is an electric control mod-
ule that includes the following functions:∙ Active Trace Control
∙ Active Engine Brake
∙ Active Ride Control
ACTIVE TRACE CONTROL
This system senses driving based on the driv-
er’s steering and acceleration/braking pat-
terns, and controls brake pressure at indi-
vidual wheels to help smooth vehicle
response.
When the lower display is used to turn off the
VDC system, the Active Trace Control sys-
tem is also turned off.
If the Active Trace Control is not functioning
properly, the FEB with Pedestrian Detection
system warning indicator light illuminates in
the instrument panel.
The Active Trace Control can be set to on
(enabled) or off (disabled) through the lower
display “Infiniti Drive Mode Selector” menu
option.
ACTIVE ENGINE BRAKE
The Active Engine Brake function adds subtle
deceleration by controlling Continuously
Variable Transmission (CVT) gear ratio, de-
pending on the cornering condition calcu-
lated from the driver’s steering input and plu-
ral sensors. This benefit is for easier
traceability and less workload of adjusting
speed with braking at corners.
The Active Engine Brake also enhances brak-
ing feel by adding subtle deceleration with
CVT gear ratio control according to the driv-
er’s brake pedal operation
The Active Engine Brake can be set to on
(enabled) or off (disabled) through the lower
display “Infiniti Drive Mode Selector” menu
option.
CHASSIS CONTROL
5-184Starting and driving

∙ Read and understand the limitations ofthe sonar system as contained in this sec-
tion. Inclement weather may affect the
function of the sonar system; this may
include reduced performance or a false
activation.
∙ The system is deactivated at speeds above 6 mph (10 km/h). It is reactivated
at lower speeds.
∙ Inclement weather or ultrasonic sources such as an automatic car wash, a truck’s
compressed-air brakes or a pneumatic
drill may affect the function of the sys-
tem; this may include reduced perfor-
mance or a false activation.
∙ The system is not designed to prevent contact with small or moving objects. Al-
ways move slowly. The system will not
detect small objects below the bumper or
on the ground.
∙ The system may not detect the following objects: fluffy objects such as snow,
cloth, cotton, glass-wool, etc.; thin ob-
jects such as rope, wire and chain, etc.; or
wedge-shaped objects. ∙ The system may not detect objects at
speeds above 3 mph (5 km/h) and may
not detect certain angular or moving
objects.
SYSTEM TEMPORARILY
UNAVAILABLE
When sonar blockage is detected, the system
will be deactivated automatically.
The system is not available until the condi-
tions no longer exist.
The sonar sensors may be blocked by tempo-
rary ambient conditions such as splashing
water, mist or fog. The blocked condition
may also be caused by objects such as ice,
frost or dirt obstructing the sonar sensors.
Action to take:
When the above conditions no longer exist,
the system will resume automatically.
SYSTEM MAINTENANCE
The sonar sensors are located on the front
and rear bumpers. Always keep the area near
the sonar sensors clean.
The sonar sensors may be blocked by tempo-
rary ambient conditions such as splashing
water, mist or fog.
The blocked condition may also be caused by
objects such as ice, frost or dirt obstructing
the sonar sensors.
Check for and remove objects obstructing
the area around the sonar sensors.
LSD2993
5-190Starting and driving

∙ The original tires have built-intread wear indicators. When the
wear indicators are visible, the
tire(s) should be replaced.
∙ Tires degrade with age and use. Have tires, including the spare,
over 6 years old checked by a
qualified technician because some
tire damage may not be obvious.
Replace the tires as necessary to
prevent tire failure and possible
personal injury.
∙ Improper service of the spare tire may result in serious personal in-
jury. If it is necessary to repair the
spare tire, it is recommended that
you visit an INFINITI retailer for
this service.
∙ For additional information re- garding tires, refer to “Important
Tire Safety Information” (US) or
“Tire Safety Information”
(Canada) in the Warranty Infor-
mation Booklet.Replacing wheels and tires
When replacing a tire, use the same size,
tread design, speed rating and load carrying
capacity as originally equipped. For addi-
tional information, refer to “Wheels and tires”
in the “Technical and consumer information”
section of this manual.
WARNING
∙ The use of tires other than those recom-
mended or the mixed use of tires of dif-
ferent brands, construction (bias, bias-
belted or radial), or tread patterns can
adversely affect the ride, braking, han-
dling, VDC system, ground clearance,
body-to-tire clearance, tire chain clear-
ance, speedometer calibration, headlight
aim and bumper height. Some of these
effects may lead to accidents and could
result in serious personal injury.
∙ For 2WD models, if your vehicle was originally equipped with four tires that
were the same size and you are only re-
placing two of the four tires, install the
new tires on the rear axle. Placing new
tires on the front axle may cause loss of
vehicle control in some driving conditions
and cause an accident and personal
injury. ∙ If the wheels are changed for any reason,
always replace with wheels which have
the same off-set dimension. Wheels of a
different off-set could cause premature
tire wear, degrade vehicle handling char-
acteristics, affect the VDC system
and/or interference with the brake discs.
Such interference can lead to decreased
braking efficiency and/or early brake
pad wear. For additional information on
wheel off-set dimensions, refer to
“Wheels and tires” in the “Technical and
consumer information” section of this
manual.
∙ When replacing a wheel without the TPMS, such as the spare tire, the TPMS
will not function and the low tire pressure
warning light will flash for approximately
1 minute. The light will remain on after
1 minute. Have your tires replaced
and/or TPMS system reset as soon as
possible. It is recommended that you visit
an INFINITI retailer for this service.
∙ Replacing tires with those not originally specified by INFINITI could affect the
proper operation of the TPMS.
∙ The TPMS sensor may be damaged if it is not handled correctly. Be careful when
handling the TPMS sensor.
Do-it-yourself8-37

11 Index
2nd row bench seat adjustment.......1-4
A
Active noise cancellation Active sound enhancement . .5-193, 5-193
Aiming control, headlights .........2-44
Air bag (See supplemental restraint
system).....................1-43
Air bag system Front (See supplemental front impact air
bag system) ................1-50
Air bag warning labels ............1-62
Airbagwarninglight.........1-62,2-15
Air bag warning light,
supplemental ..............1-62,2-15
Air cleaner ...................8-15
Air cleaner housing filter ...........8-15
Air conditioner Air conditioner operation ........4-37
Air conditioner specification label . .10-12
Air conditioner system refrigerant and oil
recommendations ............10-7
Heater and air conditioner (automatic)
(if so equipped) ..............4-36
Heater and air conditioner controls . .4-37
Servicing air conditioner .........4-43
Alarm system
(See vehicle security system) ........2-32
Anchor point locations ............1-26
Antenna ....................4-44
Antifreeze ..................5-191 Anti-lock brake warning light
........2-10
Anti-lock Braking System (ABS) .....5-180
Armrests.....................1-5
Around View® Monitor ...........4-11
Audible reminders ..............2-18
Autolight switch ...............2-40
Automatic Automatic drive positioner . . .3-38, 3-41
Automatic power window switch . . .2-67
Automatic anti-glare inside mirror .....3-36
Automaticbrakehold ............5-26
Automatic door locks .............3-6
Automatic drive positioner .....3-38,3-41
B
Backup Collision Intervention (BCI) ....5-65
Battery.................5- 191, 8-11
Charge warning light ...........2-11
Battery replacement .............8-21
INFINITI Intelligent Key .........8-22
Keyfob...................8-21
Before starting the engine ..........5-17
Belt (See drive belt) ..............8-13
Blind Spot Intervention® (BSI) .......5-53
Blind Spot Warning (BSW) .........5-44
Boosterseats.................1-39
Brake Anti-lock Braking System (ABS) . . .5-180
Brakefluid.................8-10
Brakelight(Seestoplight) .......8-24
Brake system ...............5-179 Brakewarninglight ...........2-10
Brake wear indicators
......2-18,8-18
Self-adjusting brakes ..........8-18
Brakeassist .................5-181
Brakefluid...................8-10
Brakes.....................8-18
Brake system ................. 5-179
Break-in schedule ..............5-170
Brightness control Instrument panel .............2-45
Bulb check/instrument panel ........2-10
Bulb replacement ............... 8-24
C
Camera Aiding Sonar (parking sensor) . .4-24
Capacities and recommended
fuel/lubricants ................10-2
Cargoareastoragebin...........2-60
Cargo
(See vehicle loading information) .....10-14
Car phone or CB radio ............4-45
Chassis

control ...............5-184
Check tire pressure .............. 2-26
Child restraints .....1-19,1-20, 1-22, 1-24
LATCH (Lower Anchors and Tethers for
CHildren) System .............1-24
Precautions on child
restraints ......1-22,1-29,1 -35, 1-40
Top tether strap anchor point
locations..................1-26
Child restraint with top tether strap ....1-26

Changing engine oil.............8-7
Changing engine oil filter .........8-8
Checking engine oil level ..........8-6
Engine oil ...................8-6
Engine oil and oil filter
recommendation ..............10-6
Engine oil viscosity ............10-6
Outside mirrors .................3-37
Overhead sunglasses holder .........2-57
Overheat If your vehicle overheats ..........6-7
Owner's manual order form ........10-33
Owner's manual/service manual order
information..................10-33
P
Parking Parking/parking on hills .........5-176
Parkingbrake ..........2-11,2-15,2-16
Personal lights .................2-72
Power Power door locks ..............3-6
Power outlet ................2-53
Power rear windows ...........2-67
Power steering system .....5-176, 5-176
Power windows ..............2-66
Rear power windows ...........2-67
Power outlet ..................2-53
Power steering ...........5- 176, 5-176
Precautions Maintenance precautions .........8-2
On-pavement and off-road driving
precautions..................5-9 Precautions on booster
seats..........1-22,1-29,1-35,1-40
Precautions on child
restraints
.......1-22,1-29,1-35,1-40
Precautionsonseatbeltusage .....1-11
Precautions on supplemental restraint
system ....................1-43
Precautions when starting and
driving .................5-4,5-11
Predictive Forward Collision Warning
(PFCW) ....................5-159
ProPILOT Assist ...............5-108
Push starting ...................6-7
R
Radio Car phone or CB radio ..........4-45
Rainsensor...................2-36
Readiness for inspection maintenance (I/M)
test.......................10-31
Rear Cross Traffic Alert (RCTA) .......5-74
Rear power windows .............2-67
Rearview mirror ................3-36
RearView Monitor ...............4-3
Rear window and outside mirror defroster
switch......................2-39
Rear window wiper and washer
switches .....................2-37
Recommended Fluids .............10-2
Recorders Event Data ................10-32
Refrigerant recommendation ........10-7
Registering a vehicle in another
country ....................10-10 Remote Engine Start
.........3-21, 5-18
Reporting safety defects (US only) . . . .10-30
Roadside assistance program .........6-2
Roof rack ................2-61, 2-62
S
Safety Child safety rear door lock .........3-7
Child seat belts . . .1-22, 1-29, 1-35, 1-40
Reporting safety defects (US only) . .10-30
Seat adjustment F
ront power seat adjustment .......1-3
Second row bench seats ..........1-4
Seatback pockets ...............2-55
Seat belt Childsafety.................1-19
Infantsandsmallchildren ........1-20
Injured Person ...............1-14
Largerchildren...............1-20
Precautionsonseatbeltusage .....1-11
Pregnant women .............1-14
Seat belt extenders ............1-18
Seat belt maintenance ..........1-19
Seat belts ...............1-11,7-6
Three-point type with retractor .....1-14
Seat belt extenders ..............1-18
Seat belt warning light .........1-14,2-15
Seats 2nd row bench seat adjustment .....1-4
Adjustment ..................1-2
Armrests ...................1-5
Automatic drive positioner ....3-38, 3-41
Front seats ..................1-2
Heatedseats................ 2-48
11-5