2018 INFINITI Q50 HYBRID battery replacement

7. Intelligent Key battery discharge
indicator
This indicator appears when the Intelligent
Key battery is running out of power.
If this indicator appears, replace the battery
with a new one. (See “Intelligent Key battery
replacement” (P.8-21).)
8. Hybrid system start operation for
Intelligent Key system indicator
This indicator appears when the Intelligent
Key battery is running out of power and
when the Intelligent Key System and vehicle
are not communicating normally.
If this indicator appears, touch the ignition
switch with the Intelligent Key while depres-
sing the brake pedal. (See “Intelligent Key
battery discharge” (P.5-13).)
9. Remote engine start indicator
This indicator appears when the engine has
been started using the remote start function.
To start the vehicle, depress the brake pedal
and place the ignition switch in the ON
position.
For more details, see “Remote engine start”
(P.3-19).
10. Key ID Incorrect warning
This warning appears when the ignition
switch is pushed from the LOCK position
and the Intelligent Key cannot be recognized
by the system. You cannot start the hybrid
system with an unregistered key. Use the
registered Intelligent Key.
See “Intelligent Key” (P.3-2).
11. Parking brake release warning
This warning appears when the vehicle
speed is above 4 MPH (7 km/h) and the
parking brake is applied.
12. Low fuel warning
This warning appears when the fuel level in
the tank is getting low. Refuel as soon as it is
convenient, preferably before the fuel gauge
reaches the empty (0) position.
There is a small reserve of fuel remaining in
the tank when the fuel gauge reaches the
empty (0) position.
13. Low washer fluid warning
This warning appears when the washer tank
fluid is at a low level. Add washer fluid as
necessary. (See “Window washer fluid” (P.8-
13).)
14. Door/trunk open warning
This warning appears if any of the doors
and/or the trunk lid are open or not closed
securely. The vehicle icon indicates which
door or the trunk lid is open on the display.
15. Intelligent Key system warning
This warning appears if there is a malfunc-
tion in the Intelligent Key system.
If this warning appears while the hybrid
system is stopped, the hybrid system cannot
be started. If this warning appears while the
hybrid system is running, the vehicle can be
driven. However, in these cases, have the
system checked as soon as possible. It is
recommended you visit an INFINITI retailer
for this service.
16. Loose Fuel Cap warning
This warning appears when the fuel-filler
cap is not tightened correctly after the
vehicle has been refueled. (See “Fuel-filler
cap” (P.3-25).)
17. Tire Pressure Low - Add Air
warning
This warning appears when the low tire
pressure warning light in the meter illumi-
nates and low tire pressure is detected. The
warning appears each time the ignition
switch is placed in the ON position as long
Instruments and controls2-21

CAUTION
.Be sure to carry the Intelligent Key
with you when operating the vehicle.
. Never leave the Intelligent Key in the
vehicle when you leave the vehicle.
The Intelligent Key is always communicating
with the vehicle as it receives radio waves.
The Intelligent Key system transmits weak
radio waves. Environmental conditions may
interfere with the operation of the Intelligent
Key system under the following operating
conditions.
. When operating near a location where
strong radio waves are transmitted, such
as a TV tower, power station and broad-
casting station.
. When in possession of wireless equip-
ment, such as a cellular telephone,
transceiver, and CB radio.
. When the Intelligent Key is in contact
with or covered by metallic materials.
. When any type of radio wave remote
control is used nearby.
. When the Intelligent Key is placed near
an electric appliance such as a personal
computer. .
When the vehicle is parked near a parking
meter.
In such cases, correct the operating condi-
tions before using the Intelligent Key func-
tion or use the mechanical key.
Although the life of the battery varies
depending on the operating conditions, the
battery’s life is approximately 2 years. If the
battery is discharged, replace it with a new
one.
When the Intelligent Key battery is almost
discharged, see “Intelligent Key battery dis-
charge” (P.5-13) to start the hybrid system.
Since the Intelligent Key is continuously
receiving radio waves, if the key is left near
equipment which transmits strong radio
waves, such as signals from a TV and
personal computer, the battery life may
become shorter.
For information regarding replacement of a
battery, see “Intelligent Key battery replace-
ment” (P.8-21).
As many as 4 Intelligent Keys can be
registered and used with one vehicle. For
information about the purchase and use of
additional Intelligent Keys, contact an
INFINITI retailer.
CAUTION
. Do not allow the Intelligent Key,
which contains electrical compo-
nents, to come into contact with
water or salt water. This could affect
the system function.
. Do not drop the Intelligent Key.
. Do not strike the Intelligent Key
sharply against another object.
. Do not change or modify the Intelli-
gent Key.
. Wetting may damage the Intelligent
Key. If the Intelligent Key gets wet,
immediately wipe until it is comple-
tely dry.
. Do not place the Intelligent Key for
an extended period in an area where
temperatures exceed 140°F (60°C).
. If the outside temperature is below
14°F (−10°C), the battery of the
Intelligent Key may not function
properly.
. Do not attach the Intelligent Key
with a key holder that contains a
magnet.
. Do not place the Intelligent Key near
equipment that produces a magnetic
field, such as a TV, audio equipment
Pre-driving checks and adjustments3-7

5-14Starting and driving
the brake pedal within 10 seconds after
the chime sounds. The hybrid system will
start.
After step 3 is performed, when the ignition
switch is pushed without depressing the
brake pedal, the ignition switch position will
change to ACC.
NOTE:
. When the ignition switch is pushed to
the ACC or ON position or the hybrid
system is started by the above proce-
dures, the Intelligent Key battery dis-
charge indicator appears in the vehicle
information display even if the Intelli-
gent Key is inside the vehicle. This is not
a malfunction. To turn off the Intelligent
Key battery discharge indicator, touch
the ignition switch with the Intelligent
Key again.
. If the Intelligent Key battery discharge
indicator appears, replace the battery as
soon as possible. (See “Intelligent Key
battery replacement” (P.8-21).) .
Make sure the area around the vehicle is
clear.
. Check fluid levels such as engine oil,
coolant, brake fluid and window washer
fluid as frequently as possible, or at least
whenever you refuel.
. Check that all windows and lights are
clean.
. Visually inspect tires for their appearance
and condition. Also check tires for proper
inflation.
. Lock all doors.
. Position seat and adjust head restraints.
. Adjust inside and outside mirrors.
. Fasten seat belts and ask all passengers
to do likewise.
. Check the operation of warning lights
when the ignition switch is pushed to the
ON position. (See “Warning lights, in-
dicator lights and audible reminders”
(P.2-9).) 1. Apply the parking brake.
2. Move the shift lever to P (Park) position.
The INFINITI Direct Response Hybrid
®
System is designed not to operate if the
shift lever is not in the P (Park) position.
3. Depress the brake pedal and push the ignition switch to start the hybrid sys-
tem. The READY to drive indicator light
will illuminate on the meter.
When starting the hybrid system at very
low outside temperatures, the READY
to drive indicator light will flash and it
may take longer for the READY to drive
indicator light to illuminate.
. The hybrid system may not start even
with the READY to drive indicator light
illuminated. Once the READY to drive
indicator light is illuminated you may
begin driving the vehicle.
. You may hear a sound in the engine
compartment when the brake pedal is
depressed with the hybrid system off.
This does not indicate a problem.
NOTE:
Care should be taken to avoid situations
that can lead to potential 12-volt battery
discharge and potential no-start conditions
such as:
1. Installation or extended use of electro-
nic accessories that consume 12-volt
BEFORE STARTING THE INFINITI
DIRECT RESPONSE HYBRID®SYSTEMSTARTING THE INFINITI DIRECT
RESPONSE HYBRID®SYSTEM

8 Do-it-yourself
Maintenance precautions ................................................ 8-2
Engine compartment check locations ......................... 8-3VQ35HR engine ........................................................... 8-3
Engine cooling system ..................................................... 8-5 Checking engine coolant level .................................. 8-6
Changing engine coolant ........................................... 8-7
Inverter cooling system ................................................... 8-7 Checking inverter coolant level ................................ 8-8
Changing inverter coolant ......................................... 8-9
Engine oil ........................................................................\
..... 8-9
Checking engine oil level ............................................ 8-9
Changing engine oil and oil filter .......................... 8-10
Automatic Transmission Fluid (ATF) ......................... 8-12
Brake fluid ........................................................................\
. 8-12
Window washer fluid ..................................................... 8-13
12-volt battery ................................................................. 8-14
Checking battery fluid level .................................... 8-15
Jump starting .............................................................. 8-15
Spark plugs ........................................................................\
8-15 Replacing spark plugs ............................................... 8-16
Air cleaner ........................................................................\
.. 8-16 Windshield wiper blades ............................................... 8-17
Cleaning ...................................................................... 8-17
Replacing .................................................................... 8-18
Brakes ........................................................................\
........ 8-18 Self-adjusting brakes .............................................. 8-18
Brake pad wear warning ....................................... 8-18
Fuses ........................................................................\
.......... 8-19 Engine compartment and trunk ........................... 8-19
Passenger compartment ....................................... 8-20
Intelligent Key battery replacement .......................... 8-21
Lights ........................................................................\
........ 8-24 Headlights .................................................................. 8-25
Exterior and interior lights .................................... 8-25
Wheels and tires ............................................................ 8-28 Tire pressure ............................................................. 8-28
Tire labeling ............................................................... 8-32
Types of tires ........................................................... 8-34
Tire chains .................................................................. 8-35
Changing wheels and tires .................................... 8-36
Jacking up the vehicle and replacing tires ........ 8-39

8-2Do-it-yourself
When performing any inspection or main-
tenance work on your vehicle, always take
care to prevent serious accidental injury to
yourself or damage to the vehicle. The
following are general precautions which
should be closely observed.
WARNING
.This vehicle has high voltage DC and
AC systems as well as a 12-volt
system. DC and AC high voltage is
very dangerous and can cause severe
burns and electric shock that may
result in serious injury or death.
. Never touch, disassemble, remove or
replace the high voltage parts, har-
nesses and their connectors. High
voltage cables are orange. Touching,
disassembling, removing or replacing
those parts and harnesses can cause
severe burns or electric shock that
may result in serious injury or death.
. Never try to remove the service plug
located in the trunk room. The service
plug is used only when the vehicle is
serviced by trained technicians wear-
ing personal protection equipment
and is part of the high voltage
system. Touching the service plug
can cause severe burns or electric shock that may result in serious injury
or death.
. The INFINITI Direct Response Hy-
brid
®System uses high voltage up to
408 volts. The system can be hot
while and after starting. Be careful of
both the high voltage and the high
temperature. Obey the caution labels
attached to the vehicle.
. Park the vehicle on a level surface,
apply the parking brake securely and
block the wheels to prevent the
vehicle from moving. Move the shift
lever to P (Park).
. Be sure the ignition switch is in the
OFF or LOCK position when per-
forming any parts replacement or
repairs.
. The engine can start at any time
without warning when the hybrid
system is in the READY to drive
mode. If you must work with the
hybrid system in the READY to drive
mode, keep your hands, clothing, hair
and tools away from fans, belts and
any other parts that can move.
. It is advisable to secure or remove
any loose clothing and remove any
jewelry, such as rings, watches, etc.
before working on your vehicle. .
Always wear eye protection when-
ever you work on your vehicle.
. Your vehicle is equipped with an
automatic engine cooling fan. It may
come on at any time without warn-
ing, even if the ignition key is in the
OFF position and the engine is not
running. To avoid injury, always dis-
connect the negative battery cable of
the 12-volt battery before working
near the fan.
. If you must run the engine in an
enclosed space such as a garage, be
sure there is proper ventilation for
exhaust gases to escape.
. Never get under the vehicle while it is
supported only by a jack. If it is
necessary to work under the vehicle,
support it with safety stands.
. Keep smoking materials, flame and
sparks away from the fuel tank and
the 12-volt battery.
CAUTION
.Do not work under the hood while the
engine is hot. Turn the hybrid system
off and wait until it cools down.
MAINTENANCE PRECAUTIONS

JVM0729X
CHECKING BATTERY FLUID LE-
VEL
.(blue) indicates OK.
.
(white) indicates that charging is
necessary.
.
(red) indicates that replacement is
necessary.
If it is necessary to replace the 12-volt
battery, it is recommended you contact an
INFINITI retailer.
JUMP STARTING
If jump starting is necessary, see “Jump
starting” (P.6-5). If the INFINITI Direct
Response Hybrid
®System does not start
by jump starting, the 12-volt battery may
have to be replaced. It is recommended you
visit an INFINITI retailer for this service.
WARNING
Be sure the engine and the ignition
switch are off and that the parking
brake is engaged securely.
CAUTION
Be sure to use the correct socket to
remove the spark plugs. An incorrect
socket can damage the spark plugs.
Do-it-yourself8-15
SPARK PLUGS

JVM0257X
Extended storage fuse switch (if so
equipped)
To reduce 12-volt battery drain, the ex-
tended storage fuse switch comes from the
factory switched off. Prior to delivery of
your vehicle, the switch is pushed in
(switched on) and should always remain on.
If the extended storage fuse switch is not
pushed in (switched on), the “Shipping Mode
On, Push Storage Fuse” warning may appear
in the vehicle information display. See “23.
Extended storage fuse warning” (P.2-23).
If any electrical equipment does not operate,
remove the extended storage fuse switch
and check for an open fuse.NOTE:
If the extended storage fuse switch mal-
functions or if the fuse is open, it is not
necessary to replace the switch. In this case,
remove the extended storage fuse switch
and replace it with a new fuse of the same
rating.
How to remove the extended storage fuse
switch:
1. To remove the extended storage fuse
switch, be sure the ignition switch is in
the OFF or LOCK position.
2. Be sure the headlight switch is in the OFF position.
3. Remove the fuse box cover.
4. Pinch the locking tabs
found on each
side of the storage fuse switch.
5. Pull the storage fuse switch straight out from the fuse box
.
CAUTION
Be careful not to allow children to
swallow the battery and removed parts.
Do-it-yourself8-21
INTELLIGENT KEY BATTERY
REPLACEMENT

8-22Do-it-yourself
JVM0317X
To replace the battery:
1. Release the lock knob at the back of theIntelligent Key and remove the mechan-
ical key.
2. Insert a flat-blade screwdriver wrapped with a cloth into the slit of the corner and
twist it to separate the upper part from the lower part.
3. Replace the battery with a new one. Recommended battery:
CR2032 or equivalent
.Do not touch the internal circuit andelectric terminals as it could cause a
malfunction.
.Hold the battery by the edges. Hold-
ing the battery across the contact
points will seriously deplete the sto-
rage capacity.
.Make sure that the + side faces thebottom of the case.
SDI2452
4. Align the tips of the upper and lower
parts, and then push them togetheruntil it is securely closed.
5. Operate the buttons to check its opera- tion.
If you need any assistance for replacement,
it is recommended you visit an INFINITI
retailer for this service.
FCC Notice:
For USA:
This device complies with Part 15 of the
FCC Rules. Operation is subject to the
following two conditions: (1) This device
may not cause harmful interference, and (2)
this device must accept any interference