2023 INFINITI QX55 brake sensor

To reset at a slower cruising speed, use one
of the following three methods:
1. Lightly tap the brake pedal. When the ve-hicle attains the desired speed, push the
SET- switch and release it.
2. Push and hold the SET- switch. Release the switch when the vehicle slows down
to the desired speed.
3. Push, then quickly release the SET- switch. Each time you do this, the set
speed will decrease by about 1 mph (1
km/h).
To resume the preset speed, push and release
the RES+ switch. The vehicle will resume the
last set cruising speed when the vehicle speed
is over 25 mph (40 km/h).WARNING
Failure to follow the warnings and instruc-
tions for proper use of the RAB system
could result in serious injury or death.
• The RAB system is a supplemental aid to
the driver. It is not a replacement for
proper driving procedures. Always use
the side and rear mirrors and turn and
look in the direction you will move before
and while backing up. Never rely solely
on the RAB system. It is the driver’s re-
sponsibility to stay alert, drive safely,
and be in control of the vehicle at all
times.
• There is a limitation to the RAB system
capability. The RAB system is not effec-
tive in all situations.
• 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 RAB system can assist the driver when
the vehicle is backing up and approaching
objects directly behind the vehicle. The RAB system detects obstacles behind
the vehicle using the parking sensors
O1lo-
cated on the rear bumper.
NOTE:
You can temporarily cancel the sonar func-
tion in the vehicle, but the RAB system will
continue to operate. For additional informa-
tion, see “Front and rear sonar system”
(P. 5-147).
LSD4097
REAR AUTOMATIC BRAKING (RAB)
5-104Starting and driving

•When the vehicle approaches an ob-
stacle while the accelerator or brake
pedal is depressed, the function may not
operate or the start of operation may be
delayed. The RAB system may not oper-
ate or may not perform sufficiently due
to vehicle conditions, driving conditions,
the traffic environment, the weather,
road surface conditions, etc. Do not wait
for the system to operate. Operate the
brake pedal by yourself as soon as
necessary.
• If it is necessary to override RAB opera-
tion, strongly press the accelerator
pedal.
• Always check your surroundings and
turn to check what is behind you before
and while backing up. The RAB system
detects stationary objects behind the
vehicle. The RAB system does not detect
the following objects:
– Moving objects
– Low objects
– Narrow objects
– Wedge-shaped objects
– Objects close to the bumper (less than
approximately 1 ft [30 cm])
– Objects that suddenly appear –
Thin objects such as rope, wire, chain,
etc.
• The RAB system may not operate for the
following obstacles:
– Obstacles located high off the ground
– Obstacles in a position offset from
your vehicle
– Obstacles, such as spongy materials
or snow, that have soft outer sur-
faces and can easily absorb a sound
wave
• The RAB system may not operate in the
following conditions:
– There is rain, snow, ice, dirt, etc., at-
tached to the sonar sensors.
– A loud sound is heard in the area
around the vehicle.
– The surface of the obstacle is diago-
nal to the rear of the vehicle.
• The RAB system may unintentionally op-
erate in the following conditions:
– There is overgrown grass in the area
around the vehicle.
– There is a structure (e.g., a wall, toll
gate equipment, a narrow tunnel, a
parking lot gate) near the side of the
vehicle. –
There are bumps, protrusions, or
manhole covers on the road surface.
– The vehicle drives through a draped
flag or a curtain.
– There is an accumulation of snow or
ice behind the vehicle.
– An ultrasonic wave source, such as
another vehicle’s sonar, is near the
vehicle.
• Once the automatic brake control oper-
ates, it does not operate again if the ve-
hicle approaches the same obstacle.
• The automatic brake control can only
operate for a short period of time. There-
fore, the driver must depress the brake
pedal.
• In the following situations, the RAB sys-
tem may not operate properly or may not
function sufficiently:
– The vehicle is driven in bad weather
(rain, fog, snow, etc.).
– The vehicle is driven on a steep hill.
– The vehicle’s posture is changed (e.g.,
when driving over a bump).
– The vehicle is driven on a slippery
road.
– The vehicle is turned sharply by turn-
ing the steering wheel fully.
Starting and driving5-107

–Snow chains are used.
– Wheels or tires other than INFINITI
recommended are used.
– The brakes are cold at low ambient
temperatures or immediately after
driving has started.
– The braking force becomes poor due
to wet brakes after driving through a
puddle or washing the vehicle.
• Turn the RAB system off in the following
conditions to prevent the occurrence of
an unexpected accident resulting from
sudden system operation:
– The vehicle is towed.
– The vehicle is carried on a flatbed
truck.
– The vehicle is on the chassis
dynamometer.
– The vehicle drives on an uneven road
surface.
– Suspension parts other than those
designated as Genuine INFINITI
parts are used. (If the vehicle height
or the vehicle body inclination is
changed, the system may not detect
an obstacle correctly.) –
If the vehicle is using an accessory like
a bike rack, or cargo carrier that
blocks the sensors.
• Excessive noise (e.g., audio system vol-
ume, an open vehicle window) will inter-
fere with the chime sound, and it may not
be heard.
SYSTEM MALFUNCTION
If the RAB system malfunctions, it will be
turned off automatically, the RAB system
warning light will illuminate, and the “System
fault See Owner’s Manual” warning message
will appear in the vehicle information display.
Action to take
If the warning light illuminates, park the ve-
hicle in a safe location, turn the engine off,
and restart the engine. If the warning light
continues to illuminate, have the RAB system
checked. It is recommended that you visit an
INFINITI retailer for this service.
NOTE:
If the RAB system cannot be operated tem-
porarily, the RAB system warning light
blinks.
SYSTEM MAINTENANCE
Observe the following items to ensure proper
operation of the system:
• Always keep the parking sensors
O1clean.
• If the parking sensors are dirty, wipe them off with a soft cloth while being careful to
not damage them.
• Do not subject the area around the parking sensors
O1to strong impact. Also, do not
remove or disassemble the parking sensors.
If the parking sensors and peripheral areas
are deformed in an accident, etc., have the
sensors checked. It is recommended that
you visit an INFINITI retailer for this service.
LSD4097
5-108Starting and driving

Parking brake break-in
Break in the parking brake shoes whenever
the stopping effect of the parking brake is
weakened or whenever the parking brake
shoes and/or rotors are replaced, in order to
assure the best brake performance.
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 it
cannot prevent accidents resulting from
careless or dangerous driving tech-
niques. It can help maintain vehicle con-
trol during braking on slippery surfaces.
Remember that stopping distances on
slippery surfaces will be longer than on
normal surfaces even with ABS. Stop-
ping distances may also be longer on
rough, gravel or snow covered roads, or
if you are using tire chains. Always main-
tain a safe distance from the vehicle in
front of you. Ultimately, the driver is re-
sponsible for safety. •
Tire type and condition may also affect
braking 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. For additional in-
formation, see “Tire and Loading In-
formation label” (P. 8-29).
– For additional information, see
“Wheels and tires” (P. 8-27).
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
assistance.
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.
5-140Starting and driving

Normal operation
The Anti-lock Braking System (ABS) operates
at speeds above3-6mph(5-10km/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 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 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
maintain control of the vehicle in the fol-
lowing conditions:
Understeer (vehicle tends to not follow the
steered path despite increased 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
situations.
When the VDC system operates, the
indicator light 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.
VEHICLE DYNAMIC CONTROL (VDC)
SYSTEM
Starting and driving5-141

Even if the Active Trace Control is set to OFF,
some functions will remain on to assist the
driver (for example: avoidance scenes).
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 adds subtle
deceleration with gear ratio control accord-
ing to driver’s brake pedal operation.
When the PERSONAL mode is selected, the
Active Engine Brake can be set to ON (en-
abled) or OFF (disabled). For additional infor-
mation, see “INFINITI Drive Mode Selector”
(P. 5-29).
When the lower display is used to turn off the
VDC system, the Active Engine Brake system
is also turned off.When the Active Engine Brake is operated at
corners and the “Chassis Control” mode is
selected in the vehicle information display,
the Active Engine Brake graphics are shown
in the vehicle information display. For addi-
tional information, see “Vehicle information
display” (P. 2-19).
If the chassis control warning message ap-
pears in the vehicle information display, it
may indicate that the Active Engine Brake is
not functioning properly. Have the system
checked as soon as possible. It is recom-
mended that you visit an INFINITI retailer for
this service.
WARNING
The Active Engine Brake may not be effec-
tive depending on the driving condition. Al-
ways drive carefully and attentively.
When the Active Engine Brake is operating,
the needle of the tachometer will rise up and
you may hear an engine noise. This is normal
and indicates that the Active Engine Brake is
operating properly.
You may also feel deceleration when the Ac-
tive Engine Brake is operating. However, this
is not a malfunction.
LSD4774
Starting and driving5-145

•Read and understand the limitations of
the sonar system as contained in this
section. The colors of the sonar indicator
indicates different distances to the
object.
• 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 sonar system is designed as an aid to
the driver in detecting large stationary
objects to help avoid damaging the
vehicle.
• The sonar system is not designed to pre-
vent contact with small or moving ob-
ject. Always move slowly. The system
will not detect small objects below the
bumper, and may not detect objects
close to the bumper or on the ground.
• The sonar system may not detect the fol-
lowing objects: fluffy objects such as
snow, cloth, cotton, glass-wool, etc.;
thin objects such as rope, wire and chain,
etc.; or wedge-shaped objects.CAUTION
• Excessive noise (such as audio system
volume or an open vehicle window) will
interfere with the tone and it may not be
heard.
• The front and rear sonar detect the dis-
tance between the vehicle and the ob-
stacle by detecting the sound wave re-
flected from the surface of an obstacle.
When there is a sound such as horn, or an
ultrasonic source (such as sonar of other
vehicles) around the vehicle, the sonar
may not detect objects properly.
• Keep the sonar sensors (located on the
bumper fascia) free from snow, ice and
large accumulations of dirt. Do not clean
the sonar with sharp objects. If the sen-
sors are covered, the accuracy of the so-
nar function will be diminished.
SYSTEM OPERATION
The system informs with a visual and audible
signal of front obstacles when the shift lever
is in the D (Drive) position and both front and
rear obstacles when the shift lever is in the R
(Reverse) position. Sonar Operation Table
FR Sensor RR Sensor
Range Sound Display Sound Display Px † x†
Roooo
Nx † x † Do o x †
o – Display/Beep when detect
† – Display on camera view
x – No Display and Beep
The system is deactivated at speeds above 6
mph (10 km/h). It is reactivated at lower
speeds.
The intermittent tone will stop after 3 sec-
onds when an obstacle is detected by only
the corner sensor and the distance does not
change. The tone will stop when the obstacle
get away from the vehicle.
When the object is detected, the indicator
(green) appears and blinks and the tone
sounds intermittently. When the vehicle
moves closer to the object, the color of the
indicator turns yellow and the rate of the
blinking increases. When the vehicle is very
close to the object, the indicator stops blink-
ing and turns red, and the tone sounds
continuously.
5-148Starting and driving

The system indicatorsOAwill appear when
the vehicle moves closer to an object.
SONAR LIMITATIONS
WARNING
Listed below are the system limitations for
the sonar system. Failure to operate the
vehicle in accordance with these system
limitations could result in serious injury or
death. •
Read and understand the limitations of
the sonar system as contained in this
section. Inclement weather may affect
the function of the sonar system; this
may include reduced performance or a
false activation.
• The sonar system is deactivated at
speeds above 6 mph (10 km/h). It is re-
activated 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 sonar
system; this may include reduced perfor-
mance or a false activation.
• The sonar system is not designed to pre-
vent contact with small or moving ob-
jects. Always move slowly. The system
will not detect small objects below the
bumper or on the ground.
• The sonar system may not detect the fol-
lowing objects: fluffy objects such as
snow, cloth, cotton, glass-wool, etc.;
thin objects such as rope, wire and chain,
etc.; or wedge-shaped objects; complex-
shaped objects or multiple objects in
close. •
The sonar system may not detect objects
at speeds above 3 mph (5 km/h) and may
not detect certain angular or moving
objects.
• The sonar system may not operate in the
following conditions:
– When rain, snow, ice, dirt, etc. ad- heres to the sonar.
– When a loud sound is heard in the area around the vehicle.
– When the surface of the obstacle is diagonal to the front or rear of the
vehicle.
– When a sonar or the area around the sensor is extremely hot or cold.
• The sonar system may unintentionally
operate in the following conditions:
– When there is overgrown grass in the area around the vehicle.
– When there are bumps, protrusions or manhole covers on the road
surface.
– When the vehicle drives through a draped flag or a curtain.
– When there is an accumulation of snow or ice behind the vehicle.
– When driving on a steep hill.
LSD4242
Starting and driving5-151