2019 MAZDA MODEL 3 HATCHBACK ECU

Replacing the fuses under the hood
If the headlights or other electrical
components do not work and the fuses in
the cabin are normal, inspect the fuse
block under the hood.
If a fuse is blown, it must be replaced.
Follow these steps:

1. Make sure the ignition is switched off, and other switches are off.
2. Remove the fuse block cover.
3. If any fuse but the MAIN fuse is
blown, replace it with a new one of the
same amperage rating .
1. Normal
2. Blown

WARNING
Do not replace the main fuse by
yourself. Have an Authorized Mazda
Dealer perform the replacement:
Replacing the fuse by yourself is
dangerous because the MAIN fuse is a
high current fuse. Incorrect
replacement could cause an electrical
shock or a short circuit resulting in a
fire.
4. Reinstall the cover and make sure that it is securely installed.
Maintenance and Care
Owner Maintenance
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▼Active Driving Display
Maintenance*
The dust-proof sheet has a coating. When
cleaning, do not use a hard or
rough-surface cloth, or cleaning detergent.
In addition, if a chemi
cal solvent gets on
the active driving di splay, wipe it off
immediately. The dust-proof sheet could
be damaged and the surface coating could
be scratched. Use a fin e, soft cloth such as
those used for cleaning eyeglasses.
NOTE
Use of compressed air when cleaning the
dust-proof sheet is recommended.
▼ Panel Maintenance
If a panel becomes so
iled, wipe it off with
a soft cloth soaked in clean water and
thoroughly wrung out.
If some areas require further cleaning, use
the following procedure:
1. Wipe the soiled area with a soft cloth
soaked in a mild detergent (approx.
5 %) diluted with water.
2. Wipe off the remaining detergent using a cloth soaked in clean water and
wrung out well.
NOTE
Be particularly careful when cleaning
shiny surface panels and metallic parts
such as plating as they can be scratched
easily.
▼Cleaning the Window Interiors
If the windows become covered with an
oily, greasy, or waxy film, clean them with
glass cleaner. Follow the directions on the
container.
CAUTION

Do not scrape or scratch the inside of the
window glass. It could damage the
thermal filaments and the antenna lines.
 When washing the inside of the window
glass, use a soft cloth dampened in
lukewarm water, gently wiping the
thermal filaments and the antenna lines.
Use of glass cleaning products could
damage the thermal filaments and the
antenna lines.
▼ Cleaning the Floor Mats
Rubber floor mats should be cleaned with
mild soap and water only.
WA R N I N G
Do not use rubber cleaners, such as tire
cleaner or tire shine, when cleaning rubber
floor mats:
Cleaning the rubber floor mats with rubber
cleaning products makes the
floor mats
slippery.
This may cause an accident when
depressing the accelerator, brake, or clutch
(Manual transmission) pedal or when
getting in or out of the vehicle.
After removing the floor mats for
cleaning, always rein stall them securely
(page 3-45).
Maintenance and Care
Appearance Care
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2. Remove the cover.
3. Turn the wing bolt and jack screwcounterclockwise.

1. Wing bolt
2. jack screw

5–Door
1. Remove the luggage mat.
2. Remove the jack.
To secure the jack
4–Door
1. Insert the wing bo lt into the jack with
the jack screw pointing to the front and
turn the wing bolt clockwise to
temporarily tighten it.
2. Turn the jack screw clockwise.
1. Wing bolt
2. jack screw

3. Turn the wing bolt completely to secure the jack.
NOTE
If the jack is not comp letely secured, it
could rattle while driving. Make sure the
jack screw is sufficiently tightened.
If Trouble Arises
Flat Tire
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2. Turn the spare tire hold-down boltcounterclockwise and remove the spare
tire.

1. Spare tire hold-down bolt
5–Door
1. Remove the luggage mat.
2.(Vehicles with sub-woofer)
Uncouple the sub-woofer connector.

NOTE
Extra strength may be required to
uncouple the connector. Be sure to
squeeze the tab firmly.
3. (Vehicles with sub-woofer)
Turn the spare tire hold-down bolt
counterclockwise and remove the
sub-woofer and the spare tire.

(Vehicles without sub-woofer)
Turn the spare tire hold-down bolt
counterclockwise and remove the spare
tire.

1. Spare tire hold-down bolt

To secure the spare tire
Store the spare tire in the reverse order of
removal. After storing, verify that the
spare tire is stored securely.
If Trouble Arises
Flat Tire
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WARNING
Do not apply oil or grease to lug nuts
and bolts and do not tighten the lug
nuts beyond the recommended
tightening torque:
Applying oil or grease to lug nuts and
bolts is dangerous. The lug nuts could
loosen while driving and cause the tire
to come off, resulting in an accident. In
addition, lug nuts and bolts could be
damaged if tightened more than
necessary.
4. Turn the jack handle counterclockwise using the lug wrench and lower the
vehicle.
5. Use the lug wrench to tighten the nuts in the order shown.

If you are unsure of how tight the nuts
should be, have them inspected at an
Authorized Mazda Dealer.
Nut tightening torque
N·m (kgf·m, ft·lbf) 108―147 (12―14,
80―108)
WARNING
Always securely and correctly tighten
the lug nuts:
Improperly or loosely tightened lug
nuts are dangerous. The wheel could
wobble or come off. This could result in
loss of vehicle control and cause a
serious accident.
Be sure to reinstall the same nuts you
removed or replace them with metric
nuts of the same configuration:
Because the wheel studs and lug nuts
on your Mazda have metric threads,
using a non-metric nut is dangerous.
On a metric stud, it would not secure
the wheel and would damage the stud,
which could cause the wheel to slip off
and cause an accident.
6. (Aluminum wheel eq uipped vehicle)
Remove the center cap by tapping it
from the backside o f the wheel using
the lug wrench.
7. Store the damaged tire in the trunk (4-door) or luggage compartment
(5-door).

8. Secure the damaged tire to the vehicleusing the following method.
If Trouble Arises
Flat Tire
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(Vehicles with flat tire hold-down
bolt (excluding vehicles with
sub-woofer for 5-door))
1. Spread apart the tabs on the spare tire hold-down bolt that was
removed when removing the spare
tire and remove the bolt for
securing the spare tire.
1. Tabs
2. Bolt for securing spare tire
3. Spare tire hold-down bolt

2. Remove the bolt for securing the
flat tire from its stored position and
install it in place of the removed
spare tire hold -down bolt.
1. Bolt for securing the flat tire
2. Spare tire hold-down bolt

NOTE
The longer bolt is used as the bolt
for securing the flat tire, and the
shorter one is used as the bolt for
securing the spare tire. When
installing a bolt, check the bolt's
length.
3. Secure the damaged tire to the vehicle using the flat tire
hold-down bolt.
(Vehicles with fla t tire hold-down
bolt and with sub-woofer for
5-door))
1. Remove the bolt for securing the
flat tire from its stored position.
2. Secure the damaged tire to the vehicle using the flat tire
hold-down bolt.
1. Flat tire hold-down bolt
2. Sub-woofer

If Trouble Arises
Flat Tire
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(Vehicles without flat tire hold-down
bolt)
1. Secure the damaged tire to thevehicle using the spare tire
hold-down bolt removed when
removing the spare tire.
9. Place the trunk mat (4-door) orluggage mat (5-door) on the damaged
tire.
10. Remove the tire blocks and store thetools and jack.
11. Check the inflation pressure. Refer to Tires on page 9-9.
12. Have the flat tire repaired or replaced
as soon as possible.
13. After repairing or replacing the flat
tire, install the wh eel cover (vehicles
with steel wheels) or center cap
(vehicles with aluminum wheels) using
the following procedure.
(Wheel cover)
1. Align the notch on the wheel cover with the tire valve of the wheel and
install the wheel cover to the
wheel.
1. Notch
2. Tire valve
CAUTION
Always align the notch on the wheel
cover with the tire valve of the
wheel. Otherwise, it could cause
damage to the wheel cover and the
tire valve.
(Center cap)
1. Align the center cap with the center hole of the wheel and install the
center cap to the wheel.
If Trouble Arises
Flat Tire
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Connect the negative cable to a good ground point away from the battery:
Connecting the end of the second jumper cable to the negative (–) terminal of the discharged
battery is dangerous.
A spark could cause the gas around the battery to explode and injure someone.
Route the jumper cables away from parts that will be moving:
Connecting a jumper cable near or to moving parts (cooling fans, belts) is dangerous. The
cable could get caught when the engine starts and cause serious injury.
CAUTION
Use only a 12 V booster system. You can damage a 12 V starter, ignition system, and other
electrical parts beyond repair with a 24 V power supply (two 12 V batteries in series or a 24 V
motor generator set).
1. Move the booster vehicle so that its battery is as close as p ossible to your vehicle's
battery.
2. Make sure that the power such as for the headlights and air c onditioner is turned off.
3. Remove the battery cover.
4. Turn off the booster vehicle's engine and connect the jumper cables in the following
order.
Make sure that the jumper cables are securely connected so that they do not disconnect
due to engine vibrations.
1st lead
Positive (+) terminal o n the discharged battery
Positive (+) terminal on booster vehicle's battery
2nd lead
Negative (-) terminal on booster vehicle's battery
If Trouble Arises
Battery Runs Out
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