service INFINITI QX80 2020 Workshop Manual

this service.
. The cruise indicator (green) may some-
times blink when the cruise control main
switch is turned ON while pushing the
ACCELERATE/RESUME, COAST/SET
or CANCEL switch. To properly set the
cruise control system, perform the steps
below in the order indicated.
WARNING
Do not use the cruise control when
driving under the following conditions:
. when it is not possible to keep the
vehicle at a set speed
. in heavy traffic or in traffic that
varies in speed
. on winding or hilly roads
. on slippery roads (rain, snow, ice,
etc.)
. in very windy areas
Doing so could cause a loss of vehicle
control and result in an accident.
JVS0090X
1. ACCELERATE/RESUME switch
2. COAST/SET switch
3. CANCEL switch
4. Cruise control MAIN switch
CRUISE CONTROL OPERATIONS
The cruise control allows driving at a speed
between 25 to 90 MPH (40 to 144 km/h)
without keeping your foot on the accelerator
pedal.
To turn on the cruise control, push the
MAIN switch on. The cruise indicator (white)
illuminates in the vehicle information display.
To set cruising speed, accelerate your
vehicle to the desired speed, push the
COAST/SET switch and release it. The cruise indicator (green) illuminates in the
vehicle information display. Take your foot
off the accelerator pedal. Your vehicle will
maintain the set speed.
.
To pass another vehicle, depress the
accelerator pedal. When you release the
pedal, the vehicle will return to the
previously set speed.
. The vehicle may not maintain the set
speed on winding or hilly roads. If this
happens, drive without the cruise con-
trol.
To cancel the preset speed, follow any of
these methods:
1. Push the CANCEL switch.
2. Tap the brake pedal.
3. Move the shift lever to the N (Neutral) position.
4. Turn the MAIN switch off. The color of the cruise indicator will change from
green to white.
. If you depress the brake pedal while
pushing the ACCELERATE/RESUME
or COAST/SET switch and reset at the
cruising speed, the cruise control will
disengage. Turn the MAIN switch off
once and then turn it on again.
. The cruise control will automatically
cancel if the vehicle slows more than 8
MPH (13 km/h) below the set speed.
Starting and driving5-61

.When the radar sensor area of the front
bumper is covered with dirt or is ob-
structed.
Action to take:
If the warning message appears, stop the
vehicle in a safe place, place the shift lever in
the P (Park) position and turn the engine off.
When the radar signal is temporarily inter-
rupted, clean the sensor area of the front
bumper and restart the engine. If the warn-
ing message continues to be displayed, have
the ICC system checked. It is recommended
you visit an INFINITI retailer for this service.
. When driving on roads with limited road
structures or buildings (for example, long
bridges, deserts, snow fields, driving next
to long walls)
Action to take:
When the above conditions no longer exist,
turn the ICC system back on to use the
system.
JVS0968X
Condition C:
When the ICC system is not operating
properly, the chime sounds and the ICC
system warning (yellow) will come on.
Action to take:
If the warning comes on, park the vehicle in a
safe place. Turn the engine off, restart the
engine, resume driving and set the ICC
system again.
If it is not possible to set the system or the
indicator stays on, it may indicate that the
ICC system is malfunctioning. Although the
vehicle is still driveable under normal con-
ditions, have the vehicle checked. It is
recommended you visit an INFINITI retailer for this service.
Starting and driving5-77

To cancel the preset speed,use any of the
following methods:
1. Push the CANCEL switch. The set vehicle speed indicator will turn off.
2. Tap the brake pedal. The set vehicle speed indicator will turn off.
3. Turn the MAIN switch off. Both the cruise indicator and set vehicle speed
indicator will turn off.
To reset at a faster cruising speed, use one
of the following three methods:
1. Depress the accelerator pedal. When the vehicle attains the desired speed, push
and release the COAST/SET switch.
2. Push and hold the ACCELERATE/RE- SUME set switch. When the vehicle
attains the speed you desire, release
the switch.
3. Push, then quickly release the ACCEL- ERATE/RESUME switch. Each time you
do this, the set speed will increase by
about 1 MPH (1.6 km/h).
To reset at a slower cruising speed, use one
of the following three methods:
1. Lightly tap the brake pedal. When the vehicle attains the desired speed, push
the COAST/SET switch and release it.
2. Push and hold the COAST/SET switch. Release the switch when the vehicle slows down to the desired speed.
3. Push, then quickly release the COAST/ SET switch. Each time you do this, the
set speed will decrease by about 1 MPH
(1.6 km/h).
To resume the preset speed, push and
release the ACCELERATE/RESUME
switch. The vehicle will resume the last set
cruising speed when the vehicle speed is over
25 MPH (40 km/h).
System temporarily unavailable
Under the following condition, a chime will
sound and the system control is automati-
cally canceled.
. When the vehicle slows down more than
8 MPH (13 km/h) below the set speed
. When the shift lever is shifted to the N
(Neutral) position
. When the parking brake is applied
. When the VDC (including the traction
control system) operates.
. When a wheel slipsWAF0315X
Warning light
When the system is not operating properly,
the chime sounds and the system warning
(yellow) will come on.
Action to take:
If the warning comes on, park the vehicle in a
safe place. Turn the engine off, restart the
engine, resume driving and then perform the
setting again.
If it is not possible to set or the indicator
stays on, it may indicate that the system is
malfunctioning. Although the vehicle is still
driveable under normal conditions, have the
vehicle checked. It is recommended you visit
an INFINITI retailer for this service.
Starting and driving5-81

5-92Starting and driving
Condition B:
Under the following conditions, making it
impossible to detect a vehicle ahead, the
DCA system is automatically canceled.
The chime will sound, the DCA system
indicator (orange) will come on and the
“Not Available: Front Radar Blocked” warn-
ing message will appear in the vehicle
information display.
.When the radar sensor area of the front
bumper is covered with dirt or is ob-
structed
Action to take:
If the DCA system indicator (orange) comes
on and the warning message appears, stop
the vehicle in a safe place, place the shift
lever in the P (Park) position and turn the
engine off. When the radar signal is tem-
porarily interrupted, clean the sensor area of
the front bumper and restart the engine. If
the warning message continues to be dis-
played, have the DCA system checked. It is
recommended you visit an INFINITI retailer
for this service.
. When driving on roads with limited road
structures or buildings (for example, long
bridges, deserts, snow fields, driving next
to long walls)
Action to take:
When the above conditions no longer exist, turn the DCA system back on to use the
system.
SYSTEM MALFUNCTION
Condition:
When the DCA system is not operating
properly, the chime sounds and the system
warning message “Malfunction” will appear.
Action to take:
If the warning message appears, park the
vehicle in a safe place. Turn the engine off,
restart the engine, and turn on the DCA
system again.
If it is not possible to set the system or the
indicator stays on, it may indicate that the
system is malfunctioning. Although the
vehicle is still driveable under normal con-
ditions, have the vehicle checked. It is
recommended you visit an INFINITI retailer
for this service.
JVS1154X
SENSOR MAINTENANCE
The sensor for the DCA systemis located
behind the grille of the front bumper.
The DCA system is designed to automati-
cally check the sensor’s operation. When the
sensor is covered with dirt or is obstructed,
the system will automatically be canceled. If
the sensor is covered with ice, a transparent
or translucent vinyl bag, etc., the DCA
system may not detect them. In these
instances, the DCA system may not be able
to decelerate the vehicle properly. Be sure to
check and clean the sensor regularly.
To keep the DCA system operating properly,
be sure to observe the following:

5-100Starting and driving
.The camera area of windshield glass is
continuously covered with dirt, etc.
Action to take:
When the above conditions no longer exist,
the FEB with pedestrian detection system
will resume automatically.
NOTE:
When the inside of the windshield on
camera area is misted or frozen, it will take
a period of time to remove it after air
conditioner turns on. If dirt appears on this
area, it is recommended you visit an
INFINITI retailer.
Condition B
Under the following conditions, making it
impossible to detect a vehicle ahead, the
FEB with pedestrian detection system is
automatically turned off.
The FEB system warning light (orange)
will illuminate and the “Not Available: Front
Radar Blocked” warning message will ap-
pear in the vehicle information display.
. When the sensor area of the front
bumper is covered with dirt or is ob-
structed
Action to take:
If the FEB system warning light (orange)
comes on, stop the vehicle in a safe place,
place the shift lever in the P (Park) position and turn the engine off. Clean the radar
cover below the front bumper with a soft
cloth, and restart the engine. If the FEB
system warning light continues to illuminate,
have the FEB with pedestrian detection
system checked. It is recommended you visit
an INFINITI retailer for this service.
.
When driving on roads with limited road
structures or buildings (for example, long
bridges, deserts, snow fields, driving next
to long walls)
Action to take:
When the above conditions no longer exist,
the FEB with pedestrian detection system
will resume automatically.
Condition C
When the accelerator pedal actuator detects
that the internal motor temperature is high,
the FEB with pedestrian detection system is
automatically turned off. The FEB system
warning light (orange)
will illuminate.
Action to take:
When the above conditions no longer exist,
the FEB with pedestrian detection system
will resume automatically.
Condition D
When VDC system is OFF, the FEB brake
will not operate. In this case only visible and
audible warning operates. The FEB system warning light (orange)
will illuminate.
Action to take:
When VDC system is ON, the FEB with
pedestrian detection system will resume
automatically.
SYSTEM MALFUNCTION
If the FEB with pedestrian detection system
malfunctions, it will be turned off automa-
tically, a chime will sound, the FEB system
warning light (orange)
will illuminate and
the warning message “Malfunction” will
appear.
Action to take:
If the warning light (orange)
comes on,
stop the vehicle in a safe location and place
the shift lever in the P (Park) position. Turn
the engine off and restart the engine. If the
warning light continues to illuminate, have
the FEB with pedestrian detection system
checked. It is recommended you visit an
INFINITI retailer for this service.
NOTE:
If the FEB with pedestrian detection system
stops working, the PFCW system will also
stop working.

5-108Starting and driving
WAF0318X
SYSTEM TEMPORARILY UNA-
VAILABLE
Condition A
When the radar sensor picks up interference
from another radar source, making it im-
possible to detect a vehicle ahead, the
PFCW system is automatically turned off.
The FEB system warning light (orange)
will illuminate.
Action to take:
When the above conditions no longer exist,
the PFCW system will resume automatically.
Condition B
Under the following conditions, making it
impossible to detect a vehicle ahead, the
PFCW system is automatically turned off.
The FEB system warning light (orange)
will illuminate and the “Not Available: Front
Radar Blocked” warning message will ap-
pear in the vehicle information display.
.When the sensor area of the front
bumper is covered with dirt or is ob-
structed
Action to take:
If the FEB system warning light (orange)
comes on, stop the vehicle in a safe place,
place the shift lever in the P (Park) position
and turn the engine off. Clean the radar
cover below the front bumper with a soft
cloth, and restart the engine. If the warning
light continues to illuminate, have the PFCW
system checked. It is recommended you visit
an INFINITI retailer for this service.
. When driving on roads with limited road
structures or buildings (for example, long
bridges, deserts, snow fields, driving next
to long walls)
Action to take:
When the above conditions no longer exist,
the PFCW system will resume automatically.
SYSTEM MALFUNCTION
If the PFCW system malfunctions, it will be
turned off automatically, a chime will sound,
the FEB system warning light (orange)
will
illuminate and the warning message “Mal-
function” will appear.
Action to take:
If the warning light (orange)
illuminates,
stop the vehicle in a safe location and place
the shift lever in the P (Park) position. Turn
the engine off and restart the engine. If the
warning light continues to illuminate, have
the PFCW system checked. It is recom-
mended you visit an INFINITI retailer for this
service.

.Keep your engine tuned up.
. Follow the recommended scheduled
maintenance.
. Keep the tires inflated to the correct
pressure. Low tire pressure increases tire
wear and lowers fuel economy.
. Keep the wheels in correct alignment.
Improper alignment increases tire wear
and lowers fuel economy.
. Use the recommended viscosity engine
oil. (See “Engine oil and oil filter recom-
mendation” (P.10-6).)
WARNING
. Do not attempt to raise two wheels
off the ground and shift the trans-
mission to any drive or reverse posi-
tion with the engine running. Doing
so may result in drivetrain damage or
unexpected vehicle movement which
could result in serious vehicle damage
or personal injury.
. Do not attempt to test a 4WD
equipped vehicle on a 2-wheel dy-
namometer or similar equipment even
if the other two wheels are raised off
the ground. Make sure you inform
test facility personnel that your ve-
hicle is equipped with 4WD before it
is placed on a dynamometer. Using
the wrong test equipment may result
in drivetrain damage or unexpected
vehicle movement which could result
in serious vehicle damage or personal
injury.
CAUTION
.Do not drive the vehicle in the 4HI or
4LO position on dry hard surface
roads. Driving on dry, hard surfaces in 4HI or 4LO may cause unnecessary
noise, tire wear and increased fuel
consumption.
If the Four-Wheel Drive (4WD)
warning light turns on when driving
on dry hard surface roads:
— in the 4HI position, shift the 4WD shift switch to AUTO.
— in the 4LO position, stop the vehicle and shift the transmission
lever to the N (Neutral) position
with the brake pedal depressed
and shift the 4WD shift switch to
AUTO.
If the 4WD warning light is still on
after the above operation, have
your vehicle checked. It is recom-
mended you visit an INFINITI
retailer for this service.
. The transfer case may be damaged if
you continue driving with the 4WD
warning light blinking.
See “On-pavement and off-road driving
precautions” (P.5-8) for other precautions
for offroad driving.
Starting and driving5-111
INCREASING FUEL ECONOMYINFINITI ALL-MODE 4WD®(if so equipped)

5-118Starting and driving
If any malfunction occurs in the 4WD system
when the ignition switch is placed in the ON
position, the 4WD warning light will either
remain illuminated or blink.
If the 4WD warning light comes on, the
4WD shift indicator turns off.
High-temperature transfer case oil makes
the 4WD warning light blink rapidly (about
twice per second). If the warning light blinks
rapidly during operation, stop the vehicle in a
safe place immediately. Then if the light
turns off after a while, you can continue
driving.
A large difference between the diameters of
front and rear wheels will make the 4WD
warning light blink slowly (about once per
two seconds). Change the 4WD shift switch
to AUTO and do not drive fast.
CAUTION
.If the 4WD warning light comes on or
blinks slowly during operation or
rapidly after stopping the vehicle for
a while, have your vehicle checked as
soon as possible. It is recommended
you visit an INFINITI retailer for this
service.
. Shifting between 4HI and 4LO is not
recommended when the 4WD warn- ing light turns on.
. When the 4WD warning light comes
on, the 2WD mode may be engaged
even if the 4WD shift switch is in
AUTO or 4H. Be especially careful
when driving. If corresponding parts
are malfunctioning, the 4WD mode
will not be engaged even if the 4WD
shift switch is shifted.
. Do not drive the vehicle in the 4HI or
4LO position on dry hard surface
roads. Driving on dry, hard surfaces
in 4HI or 4LO may cause unnecessary
noise, tire wear and increased fuel
consumption.
If the 4WD warning light turns on
when driving on dry hard surface
roads:
— in the AUTO or 4HI position, shift the 4WD shift switch to AUTO.
— in the 4LO position, stop the vehicle and shift the transmission
shift lever to the N (Neutral)
position and shift the 4WD shift
switch to AUTO.
. If the 4WD warning light is still on
after the above operation, have your
vehicle checked as soon as possible. It
is recommended you visit an INFINITI
retailer for this service. .
The transfer case may be damaged if
you continue driving with the warn-
ing light blinking.

5-122Starting and driving
WARNING
If the engine is not running or is turned
off while driving, the power assist for
the steering will not work. Steering will
be harder to operate.
The power assisted steering uses a hydraulic
pump, driven by the engine, to assist steer-
ing.
If the engine stops or the drive belt breaks,
you will still have control of the vehicle.
However, much greater steering effort is
needed, especially in sharp turns and at low
speeds.
BRAKING PRECAUTIONS
The brake system has two separate hydrau-
lic circuits. If one circuit malfunctions, you
will still have braking ability at two wheels.
You may feel a small click and hear a sound
when the brake pedal is fully depressed
slowly. This is not a malfunction and in-
dicates that the brake assist mechanism is
operating properly.
Hydraulically-assisted brakes
The hydraulically-assisted brake system is
designed to use a hydraulic pump driven
electrically, to assist braking. If the engine
stops, you can stop the vehicle by depressing
the foot brake pedal. However, greater foot
pressure on the foot brake pedal will be
required to stop the vehicle. The stopping
distance will be longer.
Wet brakes
When the vehicle is washed or driven
through water, the brakes may get wet. As
a result, your braking distance will be longer
and the vehicle may pull to one side during
braking.
To dry brakes, drive the vehicle at a safe
speed while lightly tapping the brake pedal
to heat-up the brakes. Do this until the
brakes return to normal. Avoid driving the
vehicle at high speeds until the brakes function correctly.
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 drums/rotors are replaced, in
order to assure the best braking perfor-
mance.
This procedure is described in the vehicle
service manual. It is recommended you visit
an INFINITI retailer for this service.
Using the brakes
Avoid resting your foot on the brake pedal
while driving. This will cause overheating of
the brakes, wearing out the brake and pads
faster and reduce gas mileage.
To help save the brakes and to prevent the
brakes from overheating, reduce speed and
downshift to a lower gear before going
down a slope or long grade. Overheated
brakes may reduce braking performance and
could result in loss of vehicle control.
WARNING
.
While driving on a slippery surface,
be careful when braking, accelerating
or downshifting. Abrupt braking or
accelerating could cause the wheels
POWER STEERING BRAKE SYSTEM

5-124Starting and driving
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
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 dis-
tances.
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 mal-
function, it switches the ABS off andilluminates the ABS warning light on the
instrument panel. The brake system then
operates 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 you visit
an INFINITI retailer for this service.
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 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
properly. However, the pulsation may indi-
cate that road conditions are hazardous 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
conditions, 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 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 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
maintain control of the vehicle, but it cannot
prevent loss of vehicle control in all driving
situations.
When the VDC system operates, the VDC
warning light
in the instrument panel
flashes so 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