2022 TOYOTA BZ4X ECU

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7-3. Do-it-yourself maintenance
Maintenance and care
Check the 12-volt battery as fol-
lows.
■12-volt battery exterior
Make sure that the 12-volt battery
terminals are not corroded and that
there are no loose connections,
cracks, or loose clamps.
Terminals
Hold-down clamp
■Checking 12-volt battery fluid
Check that the level is between the
“UPPER LEVEL” and “LOWER
LEVEL” lines.
“UPPER LEVEL” line
“LOWER LEVEL” line
If the fluid level is at or below the
“LOWER LEVEL” line, add distilled
water.
■Adding distilled water
1 Remove the vent plug.
2 Add distilled water.
If the “UPPER LEVEL” cannot be seen,
check the fluid level by looking directly at the cell.
3 Put the vent plug back on and
close it securely.
■Before recharging
When recharging, the 12-volt battery produces hydrogen gas which is flam-mable and explosive. Therefore,
observe the following precautions before recharging:
●If recharging with the 12-volt battery installed on the vehicle, be sure to dis-
NOTICE
■When adding coolant
Coolant is neither plain water nor
straight antifreeze. The correct mix- ture of water and antifreeze must be used to provide proper lubrication,
corrosion protection and cooling. Be sure to read the antifreeze or coolant label.
■If you spill coolant
Be sure to wash it off with water to prevent it from damaging parts or
paint.
Checking the 12-volt battery

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7-3. Do-it-yourself maintenance
Maintenance and care
■After a fuse is replaced
●When installing the lid, make sure that the tab is installed securely.
●If the lights do not turn on even after the fuse has been replaced, a bulb may need replacement.
●If the replaced fuse blows again, have the vehicle inspected by any autho-
rized Toyota retailer or Toyota autho- rized repairer, or any reliable repairer.
■If there is an overload in a circuit
The fuses are designed to blow, protect-
ing the wiring harness from damage.
■When replacing an electronic com- ponent, such as a lights, etc.
Toyota recommends that you use genu-
ine Toyota products designed for this vehicle. Because certain bulbs are con-nected to circuits designed to prevent
overload, non-genuine parts or parts not designed for this vehicle may be unus-able.
WARNING
■To prevent system breakdowns and vehicle fire
Observe the following precautions. Failure to do so may cause damage to the vehicle, and possibly a fire or
injury.
●Never use a fuse of a higher amperage rating than that indi-
cated, or use any other object in place of a fuse.
●Always use a genuine Toyota fuse or equivalent.Never replace a fuse with a wire,
even as a temporary fix.
●Do not modify the fuses or fuse
boxes.
NOTICE
■Before replacing fuses
Have the cause of electrical overload
determined and repaired by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer as soon as possible.

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8-1. Essential information
8-1.Esse ntial informa tion
Press the switch.
All the turn signal lights will flash. To
turn them off, press the switch once
again.
■Emergency flashers
●If the emergency flashers are used for a long time while the EV system is not operating (while the “READY” indica-
tor is not illuminated), the 12-volt bat- tery may discharge.
●If any of the SRS airbags deploy (inflate) or in the event of a strong rear impact, the emergency flashers will
turn on automatically. The emergency flashers will turn off automatically after operating for approximately 20 min-
utes. To manually turn the emergency flashers off, press the switch twice.
(The emergency flashers may not turn
on automatically depending on the force
of the impact and conditions of the colli-
sion.)
1 Steadily step on the brake pedal
with both feet and firmly depress
it.
Do not pump the brake pedal repeat- edly as this will increase the effort required to slow the vehicle.
2 Shift the shift position to N.
If the shift position is shifted to N
3 After slowing down, stop the
vehicle in a safe place by the
road.
4 Stop the EV system.
If the shift position cannot be
shifted to N
3 Keep depressing the brake
pedal with both feet to reduce
vehicle speed as much as possi-
ble.
4 To stop the EV system, press
and hold the power switch for 2
consecutive seconds or more,
Emergency flashers
The emergency flashers are
used to warn other drivers
when the vehicle has to be
stopped in the road due to a
breakdown, etc.
Operating instructions
If your vehicle has to be
stopped in an emer-
gency
Only in an emergency, such as
if it becomes impossible to
stop the vehicle in the normal
way, stop the vehicle using the
following procedure:
Stopping the vehicle

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8-2. Steps to take in an emergency
When trouble arises
When using a flat-bed truck to
transport the vehicle, use tire strap-
ping belts. Refer to the owner’s
manual of the flat-bed truck for the
tire strapping method.
In order to suppress vehicle move-
ment during transportation, set the
parking brake and turn the power
switch off.
If a tow truck is not available in an
emergency, your vehicle may be
temporarily towed using cables or
chains secured to the emergency
towing eyelets. This should only be
attempted on hard surfaced roads
for short distances at under 30
km/h (18 mph).
A driver must be in the vehicle to
steer and operate the brakes. The
vehicle’s wheels, drive train, axles,
steering and brakes must be in
good condition.
WARNING
AWD models
Be sure to transport the vehicle with
all four wheels raised off the ground. If
the vehicle is towed with the tires con-
tacting the ground, the drivetrain or
related parts may be damaged, the
vehicle may fly off the truck, or elec-
tricity generated by the operation of
the motor may cause a fire to occur
depending on the nature of the dam-
age or malfunction.
NOTICE
■To prevent damage to the vehicle
when towing using a wheel-lift type truck
●Right-hand drive vehicles: Do not
tow the vehicle from the rear when the power switch is OFF. The steer-ing lock mechanism is not strong
enough to hold the front wheels straight.
●When raising the vehicle, ensure adequate ground clearance for tow-ing at the opposite end of the raised
vehicle. Without adequate clear- ance, the vehicle could be dam-aged while being towed.
■Towing with a sling-type truck
Do not tow with a sling-type truck to prevent body damage.
Using a flatbed truck
Emergency towing

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8-2. Steps to take in an emergency
To have your vehicle towed by
another vehicle, the towing eyelet
must be installed to your vehicle.
Install the towing eyelet using the
following procedure.
1 Take out the wheel bolt wrench
and towing eyelet.
( P.489,530)
2 Remove the eyelet cover using
a flathead screwdriver.
To protect the bodywork, place a rag between the screwdriver and the vehi-cle body as shown in the illustration.
3 Insert the towing eyelet into the
hole and tighten partially by
hand.
4 Tighten down the towing eyelet
securely using a wheel bolt
wrench or hard metal bar.
5 Securely attach cables or chains
to the towing eyelet.
Take care not to damage the vehicle body.
6 Enter the vehicle being towed
and start the EV system.
If the EV system does not start, turn the power switch to ON.
7 Shift the shift position to N and
release the parking brake.
Turn automatic mode off. ( P.255)
■While towing
If the EV system is off, the power assist
for the brakes and steering will not func- tion, making steering and braking more difficult.
■Wheel bolt wrench
Wheel bolt wrench is installed in lug- gage compartment. ( P.489, 530)
Emergency towing proce-
dure
WARNING
Observe the following precautions.
Failure to do so may result in death or serious injury.

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8-2. Steps to take in an emergency
When trouble arises
Fluid leaks under the vehicle
(Water dripping from the air con-
ditioning after use is normal.)
 Flat-looking tires or uneven tire
wear
 Excessive tire squeal when cor-
nering
 Strange noises related to the
suspension system
 Other noises related to the EV
system
 Stumbling or running roughly
 Appreciable loss of power
 Vehicle pulls heavily to one side
when braking
 Vehicle pulls heavily to one side
when driving on a level road
WARNING
■While towing
●When towing using cables or
chains, avoid sudden starts, etc., which place excessive stress on the towing eyelets, cables or chains.
The towing eyelets, cables or chains may become damaged, bro-ken debris may hit people, and
cause serious damage.
●Do not perform any of the following
as doing so may cause the parking lock mechanism to engage, locking the front wheels and possibly lead-
ing to an accident resulting in death or serious injury:
• Unfasten the driver’s seat belt and open the driver’s door.
• Turn the power switch off.
■Installing towing eyelets to the
vehicle
Make sure that towing eyelets are installed securely. If not securely
installed, towing eyelets may come loose during towing.
NOTICE
■To prevent damage to the vehicle during emergency towing
Do not secure cables or chains to the
suspension components.
If you think something is
wrong
If you notice any of the follow-
ing symptoms, your vehicle
probably needs adjustment or
repair. Contact any authorized
Toyota retailer or Toyota
authorized repairer, or any reli-
able repairer as soon as possi-
ble.
Visible symptoms
Audible symptoms
Operational symptoms

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8-2. Steps to take in an emergency
When trouble arises
■If a message that indicates the
need for visiting any authorized Toyota retailer or Toyota authorized repairer, or any rel iable repairer is
displayed
The system or part shown on the multi- information display is malfunctioning.
Have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer immediately.
■If a message that indicates the need for the rotary shifter operation is displayed
To prevent the rotary shifter from being operated incorrectly or the vehicle from moving unexpectedly, a message that
requires shifting the shift position may be displayed on the multi-information display. In that case, follow the instruc-
tion of the message and shift the shift position.
■If a message that indicates the need for referring to Owner’s Man-
ual is displayed
●If any of the following messages are
shown on the multi-information dis- play, follow the instructions.• “Battery Low” ( P.544)
• “Check Charging System Close Charging Port Lid” ( P.160) • “Charging system malfunction”
( P.160) • “Charging stopped High energy use” ( P.160)
●If any of the following messages are shown on the multi-information dis-
play, it may indicate a malfunction. Have the vehicle inspected by any authorized Toyota retailer or Toyota
authorized repairer, or any reliable repairer immediately.• “Entry & Start System Malfunction”
• “Traction battery system malfunction” • “Accelerator system malfunction”• “Plug-in Charging System Malfunc-
tion” • “EV system malfunction”• “Shift System Malfunction Apply Park-
ing Brake Securely When Parking See
Owner’s Manual”
• “Shift System Malfunction See Owner’s Manual”• “Shift System Malfunction Stop in a
Safe Place See Owner’s Manual” • “P Switch Malfunction Apply Parking Brake Securely When Parking See
Owner’s Manual” • “Shift System Unavailable Apply Park-ing Brake Securely When Parking See
Owner’s Manual” • “Battery Low Shifting Unavailable See Owner’s Manual”
●If any of the following messages are shown on the multi-information dis-
play, it may indicate a malfunction. Immediately stop the vehicle and con-tact any authorized Toyota retailer or
Toyota authorized repairer, or any reli- able repairer.• “Braking Power Low”
NOTICE
■If “High Power Consumption Power to Climate Temporarily Limited” is displayed frequently
There is a possible malfunction relat- ing to the charging system or the 12-volt battery may be deteriorating.
Have the vehicle inspected by any authorized Toyota retailer or Toyota authorized repairer, or any reliable
repairer.
■If “Battery Low” is displayed fre-
quently
The 12-volt battery may have deterio- rated. As the battery may discharge in
this state when left unattended, have the battery inspected by any autho-rized Toyota retailer or Toyota autho-
rized repairer, or any reliable repairer.

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8-2. Steps to take in an emergency
When trouble arises
2Remove the hose and take out
the power plug from the com-
pressor.
3 Connect the bottle to the com-
pressor.
Insert and connect the bottle straight into the compressor as shown in the
illustration, and check that the claws of the bottle are concealed in the holes.
4 Connect the hose to the bottle.
As shown in the illustration, make sure the hose is connected securely to the
bottle.
5 Remove the valve cap from the
valve of the punctured tire.
6 Extend the hose. Remove the
air release cap from the hose.
You will use the air release cap again.