
6–29
Maintenance and Care
Owner Maintenance
Vehicle Engine Control Unit Reset Procedure
NOTE
This procedure is intended for vehicles with the engine oil flexible maintenance setting
selected.
After replacing the engine oil, have a repair shop such as an Authorized Mazda Dealer
perform the initialization (engine oil data resetting) of the recorded\
value. If the value
recorded by the computer is not initialized, the wrench indicator light \
may not turn off or it
may turn on earlier than normal.
NOTE
The initialization (engine oil data resetting) of the recorded value can be performed using
the following procedure:
1. Switch the ignition OFF.
2. Switch the ignition ON with the selector pr essed, and press and hold the selector for
about 5 seconds until the master warning light flashes.
Selector
3. After the master warning light flashes for several seconds, the initialization is
completed.
Mazda3_8FA4-EA-15G_Edition1.indb 292015/05/11 14:02:15

6–40
Maintenance and Care
Owner Maintenance
Battery Maintenance
To get the best service from a battery:
Keep it securely mounted. Keep the top clean and dry. Keep terminals and connections clean,
tight, and coated with petroleum jelly or
terminal grease.
Rinse off spilled electrolyte immediately
with a solution of water and baking
soda.
If the vehicle will not be used for an
extended time, disconnect the battery
cables and charge the battery every six
weeks.
Battery Replacement
Contact an Authorized Mazda Dealer for a
battery replacement purchase.
Battery Replacement
If the buttons on the transmitter are
inoperable and the operation indicator
light does not flash, the battery may be
dead.
Replace with a new battery before the
transmitter becomes unusable.
CAUTION
Make sure the battery is installed
correctly. Battery leakage could occur if it
is not installed correctly.
When replacing the battery, be careful
not to touch any of the internal circuitry
and electrical terminals, bend the
electrical terminals, or get dirt in the
transmitter as the transmitter could be
damaged.
There is the danger of explosion if the
battery is not correctly replaced. Dispose of used batteries according to
the following instructions.
Insulate the plus and minus terminals
of the battery using cellophane or
equivalent tape.
Never disassemble. Never throw the battery into fire or
water. Never deform or crush.
Replace only with the same type battery
(CR2025 or equivalent).
Mazda3_8FA4-EA-15G_Edition1.indb 402015/05/11 14:02:19

6–41
Maintenance and Care
Owner Maintenance
The following conditions indicate that the
battery power is low:
The KEY indicator light (green) flashes
in the instrument cluster for about 30
seconds after the engine is turned off.
The system does not operate and
the operation indicator light on the
transmitter does not flash when the
buttons are pressed.
The system's operational range is
reduced.
Replacing the battery at an Authorized
Mazda Dealer is recommended to prevent
damage to the key. If replacing the battery
by yourself, follow the instruction below.
Replacing the key battery
1. Press the knob and pull out the
auxiliary key.
Knob
2. Twist a tape-wrapped flathead
screwdriver in the direction of the
arrow and open the cover slightly.
Cove r
3. Insert the tape-wrapped flathead
screwdriver into the gap and slide it in
the direction of the arrow.
Cover
Gap
4. Twist the flathead screwdriver in the
direction of the arrow and remove the
cover.
Cover
Mazda3_8FA4-EA-15G_Edition1.indb 412015/05/11 14:02:20

6–45
Maintenance and Care
Owner Maintenance
Replacing a Tire
WARNING
Always use tires that are in good
condition:Driving with worn tires is dangerous.
Reduced braking, steering, and
traction could result in an accident.
Replace all four tires at the same time: Replacing just one tire is dangerous. It
could cause poor handling and poor
braking resulting in loss of vehicle
control. Mazda strongly recommends
that you replace all four tires at the
same time.
If a tire wears evenly, a wear indicator will
appear as a solid band across the tread.
Replace the tire when this happens.
New tread Tread wear indicator
Worn tread
You should replace the tire before the band
crosses the entire tread.
(With tire pressure monitoring system)
After adjusting the tire pressure,
initialization of the tire pressure
monitoring system is necessary to make
the system operate normally.
Refer to Tire Pressure Monitoring System
Initialization on page 4-126.
NOTE
Tires degrade over time, even when
they are not being used on the road. It
is recommended that tires generally be
replaced when they are 6 years or older.
Heat caused by hot climates or frequent
high loading conditions can accelerate
the aging process. You should replace the
spare tire when you replace the other road
tires due to the aging of the spare tire. The
period in which the tire was manufactured
(both week and year) is indicated by a
4-digit number.
Refer to Tire Labeling on page 8-24.
Temporary Spare Tire
Inspect the temporary spare tire at least
monthly to make sure it is properly
inflated and stored.
NOTE
The temporary spare tire condition
gradually deteriorates even if it has not
been used.
The temporary spare tire is easier to
handle because of its construction which
is lighter and smaller than a conventional
tire. This tire should be used only for an
emergency and only for a short distance.
Use the temporary spare tire only until the
conventional tire is repaired, which should
be as soon as possible.
Refer to Tires on page 9-10.
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6–46
Maintenance and Care
Owner Maintenance
*Some models.
CAUTION
Do not use your temporary spare tire
rim with a snow tire or a conventional
tire. Neither will properly fit and could
damage both tire and rim.
The temporary spare tire has a tread life
of less than 5,000 km (3,000 miles). The
tread life may be shorter depending on
driving conditions.
The temporary spare tire is for limited
use, however, if the tread wear solid-
band indicator appears, replace the tire
with the same type of temporary spare
(page 8-24).
NOTE
Tires degrade over time, even when
they are not being used on the road. It
is recommended that tires generally be
replaced when they are 6 years or older.
Heat caused by hot climates or frequent
high loading conditions can accelerate
the aging process. You should replace the
spare tire when you replace the other road
tires due to the aging of the spare tire. The
period in which the tire was manufactured
(both week and year) is indicated by a
4-digit number.
Refer to Tire Labeling on page 8-24.
Replacing a Wheel
WARNING
Always use wheels of the correct size on
your vehicle:
Using a wrong-sized wheel is
dangerous. Braking and handling
could be affected, leading to loss of
control and an accident.
CAUTION
A wrong-sized wheel may adversely
affect:
Tire fit Wheel and bearing life Ground clearance Snow-chain clearance Speedometer calibration Headlight aim Bumper height Tire Pressure Monitoring System*
NOTE
When replacing a wheel, make sure
the new one is the same as the original
factory wheel in diameter, rim width,
and offset (inset/outset).
For details, contact an Authorized
Mazda Dealer.
Proper tire balancing provides the best
riding comfort and helps reduce tread
wear. Out-of-balance tires can cause
vibration and uneven wear, such as
cupping and flat spots.
Mazda3_8FA4-EA-15G_Edition3.indb 462015/12/04 19:25:15

6–47
Maintenance and Care
Owner Maintenance
Light Bulbs
Overhead lights (Front)/
Map lights
Vanity mirror
lightsHeadlights (Low/High beam)
Daytime running lights/
Parking lights Headlights (Low beam)
Headlights (High beam)/
Daytime running lights
Fog lights
Fog lights
Front side-marker lights
Front side-marker lights
Side turn signal lights
Side turn signal lightsOverhead lights (Front)/
Map lights
Vanity mirror
lights
Some models.
Front turn signal lights Front turn signal lights
Brake lights (LED type)
Brake lights/Taillights/Rear
side-marker lights (Bulb type)
Taillights/Rear side-marker
lights (LED type) Taillights/Rear side-marker
lights (LED type)
Rear turn signal lights
Taillights (Trunk lid side) Reverse lights
High-mount brake light License plate lights Trunk light
Overhead light (Rear)Overhead light (Rear)
Brake lights (LED type)
Luggage
compartment light
Brake lights/Taillights/Rear
side-marker lights (Bulb type)
Rear turn signal lights
Taillights (Liftgate side) Reverse lights
High-mount brake light License plate lights
4-Door5-Door
With Xenon Fusion HeadlightsWith Halogen Headlights
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6–48
Maintenance and Care
Owner Maintenance
WARNING
Do not replace the xenon fusion bulbs
yourself:Replacing the xenon fusion bulbs
yourself is dangerous. Because the
xenon fusion bulbs require high
voltage, you could receive an electric
shock if the bulbs are handled
incorrectly. Consult an Authorized
Mazda Dealer when the replacement is
necessary.
Never touch the glass portion of a
halogen bulb with your bare hands
and always wear eye protection when
handling or working around the bulbs: When a halogen bulb breaks, it is
dangerous. These bulbs contain
pressurized gas. If one is broken, it will
explode and serious injuries could be
caused by the flying glass.
If the glass portion is touched with
bare hands, body oil could cause the
bulb to overheat and explode when lit.
Always keep halogen bulbs out of the
reach of children: Playing with a halogen bulb is
dangerous. Serious injuries could be
caused by dropping a halogen bulb or
breaking it some other way.
CAUTION
When removing the lens or lamp unit
using a flathead screwdriver, make
sure that the flathead screwdriver does
not contact the interior terminal. If
the flathead screwdriver contacts the
terminal, a short circuit may occur.
NOTE
To replace the bulb, contact an
Authorized Mazda Dealer. If the halogen bulb is accidentally
touched, it should be cleaned with
rubbing alcohol before being used.
Use the protective cover and carton for
the replacement bulb to dispose of the
old bulb promptly and out of the reach
of children.
Replacing Exterior Light Bulbs
Headlights (With xenon fusion
headlights)
Low/High beam bulbs
You cannot replace the low/high beam
bulbs by yourself. The bulbs must be
replaced at an Authorized Mazda Dealer.
Headlights (With halogen headlights)
Low-beam bulbs
1. If you are changing the right bulb, start
the engine, turn the steering wheel all
the way to the left, and turn off engine.
If you are changing the left bulb, turn
the steering wheel to the right, and turn
off engine.
2. Make sure the headlight switch is of f.
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6–50
Maintenance and Care
Owner Maintenance
High-beam bulbs/Daytime running
lights
1. Make sure the ignition is switched off,
and the headlight switch is off.
2. Lift the hood.
3. Disconnect the connector from the unit
by pressing the tab on the connector
with your finger and pulling the
connector downward.
4. Turn the socket and bulb assembly
to remove it. Carefully remove the
bulb from its socket in the reflector by
gently pulling it straight backward out
of the socket.
5. Install the new bulb in the reverse order
of the removal procedure.
Daytime running lights/Parking lights
(With xenon fusion headlights)
The LED bulb cannot be replaced as a
single unit because it is an integrated unit.
The LED bulb has to be replaced with the
unit. We recommend an Authorized Mazda
Dealer when the replacement is necessary.
Front turn signal lights, Parking lights/
Front side-marker lights (With halogen
headlights), Front side-marker lights
(With xenon fusion headlights)
1. If you are changing the right bulb, start
the engine, turn the steering wheel all
the way to the left, and turn off engine.
If you are changing the left bulb, turn
the steering wheel to the right, and turn
off engine.
2. Make sure the headlight switch is off.
3. Pull the center of each plastic retainer
and remove the retainers.
Removal
Installation
Mazda3_8FA4-EA-15G_Edition1.indb 502015/05/11 14:02:23