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LEXUS RX 450HL (2019 year). Instruction - part 43

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8-2. Steps to take in an emergency

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WARNING

■

When using the compact spare tire

●

Remember that the compact spare tire provided is specifically designed for use with

your vehicle. Do not use your compact spare tire on another vehicle.

●

Do not use more than one compact spare tire simultaneously.

●

Replace the compact spare tire with a standard tire as soon as possible.

●

Avoid sudden acceleration, abrupt steering, sudden braking and shifting operations

that cause sudden engine braking.

■

When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may not

operate correctly:

Also, not only can the following system not be utilized fully, but it may even negatively

affect the drive-train components:
• E-Four

■

Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is

installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to observe

this precaution may lead to an accident causing death or serious injury.

■

After using the tools and jack
Before driving, make sure all the tools and jack are securely in place in their storage

location to reduce the possibility of personal injury during a collision or sudden brak-

ing.

• ABS & Brake assist

• VSC

• TRAC

• EPS

• Trailer Sway Control

• VDIM

• Adaptive Variable Suspension System

(if equipped)

• Dynamic radar cruise control with full-

speed range

• PCS (Pre-Collision System)

• LKA (Lane-Keeping Assist)

• Automatic High Beam

• AFS (Adaptive Front-lighting System)

(if equipped)

• Tire pressure warning system

• Intuitive parking assist (if equipped)

• Intelligent Clearance Sonar (ICS) (if

equipped)

• Lexus parking assist monitor (if

equipped)

• Panoramic view monitor (if equipped)

• BSM (Blind Spot Monitor) (if

equipped)

• Navigation system (if equipped)

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NOTICE

■

Be careful when driving over bumps with the compact spare tire installed on the vehi-

cle
When driving with the compact spare tire installed, the vehicle height will be different

than when driving with standard tires. Be careful when driving over uneven road sur-

faces, etc.

■

Driving with tire chains and the compact spare tire
Do not fit tire chains to the compact spare tire.

Tire chains may damage the vehicle body and adversely affect driving performance.

■

When replacing the tires
When removing or fitting the wheels, tires or the tire pressure warning valve and trans-

mitter, contact your Lexus dealer as the tire pressure warning valve and transmitter

may be damaged if not handled correctly.

■

When stowing the flat tire (RX450hL)

●

Ensure that there is no object caught between the tire and the vehicle underbody.

●

Securely tighten the spare tire clamp bolt to hold the spare wheel carrier by the hook.

●

Stow the flat tire in the spare tire location. Failure to do so may cause damage to the

spare tire carrier. Proper storage reduces the possibility of injury in a collision or

during sudden braking.

●

Have the flat tire repaired and the spare tire replaced with it as soon as possible.

■

Proper storage of the spare tire (RX450hL)

●

If the spare tire clamp bolt is turned without a tire on the hoist assembly, the wire cable

may not be able to be lowered. If the wire cable cannot be lowered, contact your

Lexus dealer.

●

If the hoist assembly is slanted when stowing a

tire, the hoist assembly may become stuck in

the wheel opening and the tire may not be

raised properly, causing damage to the wheel

or the wire cable.

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8-2. Steps to take in an emergency

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One of the following may be the cause of the problem:

●

The electronic key may not be functioning properly.

(

P. 692)

●

There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.

●

There may be a malfunction in the immobilizer system. (

P. 83)

●

There may be a malfunction in the steering lock system.

●

The hybrid system may be malfunctioning due to an electrical problem such
as electronic key battery depletion or a blown fuse. However, depending on
the type of malfunction, an interim measure is available to start the hybrid sys-
tem. (

P. 691)

One of the following may be the cause of the problem:

●

The 12-volt battery may be discharged. (

P. 695)

●

The 12-volt battery terminal connections may be loose or corroded.
(

P. 691)

If the hybrid system will not start

Reasons for the hybrid system not starting vary depending on the situation.
Check the following and perform the appropriate procedure:

The hybrid system will not start even though the correct starting proce-
dure is being followed. (

P. 239)

The interior lights and headlights are dim, or the horn does not sound or
sounds at a low volume.

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One of the following may be the cause of the problem:

●

The 12-volt battery may be discharged. (

P. 695)

●

One or both of the 12-volt battery terminals may be disconnected. (

P. 605)

Contact your Lexus dealer if the problem cannot be repaired, or if repair procedures

are unknown.

When the hybrid system does not start, the following steps can be used as an
interim measure to start the hybrid system if the power switch is functioning nor-
mally.
Do not use this starting procedure except in cases of emergency.

Turn the power switch to ON mode and check that the parking brake is set.
(

P. 240, 253)

Shift the shift lever to P.
Turn the power switch to ACCESSORY mode.
Press and hold the power switch for about 15 seconds while depressing the
brake pedal firmly.

Even if the hybrid system can be started using the above steps, the system may
be malfunctioning. Have the vehicle inspected by your Lexus dealer.

The interior lights and headlights do not turn on, or the horn does not
sound.

Emergency start function

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8-2. Steps to take in an emergency

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■

Unlocking the door
Use the mechanical key (

P. 133) in order to perform the following opera-

tions:

Insert the mechanical key while
pulling on the driver’s door han-
dle.

Unlocking the door.

Turning the key rearward unlocks the

driver’s door. Turning the key again

unlocks the other doors.

Remove the key, return the handle, and then pull the handle again.

If the electronic key does not operate properly

If communication between the electronic key and vehicle is interrupted
(

P. 160) or the electronic key cannot be used because the battery is

depleted, the smart access system with push-button start and wireless
remote control cannot be used. In such cases, the doors can be opened and
the hybrid system can be started by following the procedure below.

Locking and unlocking the doors

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Locking the door

With the door open, push down
the inside lock button.

Close the door.

■

Key linked functions

Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of the
electronic key to the power switch.

When the electronic key is detected, a

buzzer sounds and the power switch will

turn to ON mode.

When the smart access system with

push-button start is deactivated in cus-

tomization setting, the power switch will

turn to ACCESSORY mode.

Firmly depress the brake pedal and check that

is shown on the multi-

information display.
Press the power switch shortly and firmly.

In the event that the hybrid system still cannot be operated, contact your Lexus
dealer.

Closes the windows and the moon roof

panoramic moon roof

(turn and hold)

Opens the windows and the moon roof

panoramic moon roof

(turn and hold)

These settings must be customized at your

Lexus dealer.

: If equipped

Starting the hybrid system

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8-2. Steps to take in an emergency

RX450h_RX450hL_U

■

Stopping the hybrid system
Shift the shift lever to P, set the parking brake, and press the power switch as you normally

do when stopping the hybrid system.

■

Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the electronic

key battery be replaced immediately when the battery is depleted. (

P. 630)

■

Changing power switch modes
Release the brake pedal and press the power switch in step above.

The hybrid system does not start and modes will be changed each time the switch is

pressed. (

P. 240)

■

When the electronic key does not work properly

●

Make sure that the smart access system with push-button start has not been deacti-

vated in the customization setting. If it is off, turn the function on.

(Customizable features

P. 740)

●

Check if battery-saving mode is set. If it is set, cancel the function. (

P. 160)

WARNING

■

When using the mechanical key and operating the power windows or the moon roof

or panoramic moon roof
Operate the power window or the moon roof or panoramic moon roof after checking

to make sure that there is no possibility of any passenger having any of their body parts

caught in the window or the moon roof or panoramic moon roof.

Also, do not allow children to operate the mechanical key. It is possible for children and

other passengers to get caught in the power window or the moon roof or panoramic

moon roof.

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8-2. Steps to take in an emergency

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If you have a set of jumper (or booster) cables and a second vehicle with a 12-volt
battery, you can jump start your vehicle by following the steps below.

Confirm that the electronic key is
being carried.

When connecting the jumper (or

booster) cables, depending on the situa-

tion, the alarm may activate and doors

locked. (



P. 87)

Open the hood (

P. 595) and fuse

box cover.

Open the exclusive jump starting
terminal cover.

If the 12-volt battery is discharged

The following procedures may be used to start the hybrid system if the vehi-
cle’s 12-volt battery is discharged.
You can also call your Lexus dealer or a qualified repair shop.

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8-2. Steps to take in an emergency

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Remove the engine cover.

Connect the jumper cables according to the following procedure:

Connect a positive jumper cable clamp to the exclusive jump starting ter-
minal on your vehicle.
Connect the clamp on the other end of the positive cable to the positive (+)
battery terminal on the second vehicle.
Connect a negative cable clamp to the negative (-) battery terminal on the
second vehicle.
Connect the clamp at the other end of the negative cable to a solid, station-
ary, unpainted metallic point away from the exclusive jump starting terminal
and any moving parts, as shown in the illustration.

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Start the engine of the second vehicle. Increase the engine speed slightly and
maintain at that level for approximately 5 minutes to recharge the 12-volt bat-
tery of your vehicle.
Open and close any of the doors of your vehicle with the power switch off.
Maintain the engine speed of the second vehicle and start the hybrid system
of your vehicle by turning the power switch to ON mode.
Make sure the “READY” indicator comes on. If the indicator light does not
come on, contact your Lexus dealer.
Once the hybrid system has started, remove the jumper cables in the exact
reverse order from which they were connected.
Close the exclusive jump starting terminal cover, and reinstall the fuse box
cover to its original position.

Once the hybrid system starts, have the vehicle inspected at your Lexus dealer
as soon as possible.

■

Starting the hybrid system when the 12-volt battery is discharged
The hybrid system cannot be started by push-starting.

■

To prevent 12-volt battery discharge

●

Turn off the headlights and the audio system while the hybrid system is off.

●

Turn off any unnecessary electrical components when the vehicle is running at a low

speed for an extended period, such as in heavy traffic.

■

When removing the battery terminals
When the battery terminals are removed, the information stored in the ECU is cleared.

Before removing the battery terminals, contact your Lexus dealer.

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8-2. Steps to take in an emergency

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■

Charging the 12-volt battery
The electricity stored in the 12-volt battery will discharge gradually even when the vehicle

is not in use, due to natural discharge and the draining effects of certain electrical appli-

ances. If the vehicle is left for a long time, the 12-volt battery may discharge, and the

hybrid system may be unable to start. (The 12-volt battery recharges automatically while

the hybrid system is operating.)

■

When the 12-volt battery is removed or discharged

●

In some cases, it may not be possible to unlock the doors using the smart access system

with push-button start when the 12-volt battery is discharged. Use the wireless remote

control or the mechanical key to lock or unlock the doors.

●

The hybrid system may not start on the first attempt after the 12-volt battery has

recharged but will start normally after the second attempt. This is not a malfunction.

●

The power switch mode is memorized by the vehicle. When the 12-volt battery is

reconnected, the system will return to the mode it was in before the 12-volt battery was

discharged. Before disconnecting the 12-volt battery, turn the power switch off.

If you are unsure what mode the power switch was in before the 12-volt battery dis-

charged, be especially careful when reconnecting the 12-volt battery.

●

The power back door must be initialized. (

P. 150)

■

When replacing the 12-volt battery

●

RX450h: Use a Central Degassing type 12-volt battery (European Regulations).

RX450hL: Use a 12-volt battery designed for this vehicle.

●

RX450h: Use a 12-volt battery that the case size is same as the previous one (LN2),

20 hour rate capacity (20HR) is equivalent (60Ah) or greater, and performance rating

(CCA) is equivalent (460A) or greater.
• If the sizes differ, the 12-volt battery cannot be properly secured.

• If the 20 hour rate capacity is low, even if the time period where the vehicle is not

used is a short time, the 12-volt battery may discharge and the hybrid system may

not be able to start.

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●

Use a 12-volt battery with a handle. If a 12-volt battery without a handle is used, removal

is more difficult.

●

After replacing, firmly attach the following items to the exhaust hole of the 12-volt bat-

tery.
• Use the exhaust hose that was attached to

the 12-volt battery before replacing and

confirm that it is firmly connected to the

hole section of the vehicle.

• Use the exhaust hole plug included with the

12-volt battery replaced or the one installed

on the 12-volt battery prior to the replace-

ment. (Depending on the 12-volt battery to

be replaced, the exhaust hole may be

plugged.)

Exhaust hole plug
Exhaust hole
Exhaust hose
Hole section of the vehicle



RX450h

For details, consult your Lexus dealer.



RX450hL

WARNING

■

When removing the battery terminals
Always remove the negative (-) terminal first. If the positive (+) terminal contacts any

metal in the surrounding area when the positive (+) terminal is removed, a spark may

occur, leading to a fire in addition to electrical shocks and death or serious injury.

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8-2. Steps to take in an emergency

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WARNING

■

Avoiding 12-volt battery fires or explosions
Observe the following precautions to prevent accidentally igniting the flammable gas

that may be emitted from the 12-volt battery:

●

Make sure each jumper cable is connected to the correct terminal and that it is not

unintentionally in contact with any other than the intended terminal.

●

Do not allow the other end of the jumper cable connected to the “+” terminal to come

into contact with any other parts or metal surfaces in the area, such as brackets or

unpainted metal.

●

Do not allow the + and - clamps of the jumper cables to come into contact with each

other.

●

Do not smoke, use matches, cigarette lighters or allow open flame near the 12-volt

battery.

■

12-volt battery precautions
The 12-volt battery contains poisonous and corrosive acidic electrolyte, while related

parts contain lead and lead compounds. Observe the following precautions when han-

dling the 12-volt battery:

●

When working with the 12-volt battery, always wear safety glasses and take care not

to allow any battery fluids (acid) to come into contact with skin, clothing or the vehicle

body.

●

Do not lean over the 12-volt battery.

●

In the event that battery fluid comes into contact with the skin or eyes, immediately

wash the affected area with water and seek medical attention.

Place a wet sponge or cloth over the affected area until medical attention can be

received.

●

Always wash your hands after handling the 12-volt battery support, terminals, and

other battery-related parts.

●

Do not allow children near the 12-volt battery.

■

After recharging the 12-volt battery
Have the 12-volt battery inspected at your Lexus dealer as soon as possible.

If the 12-volt battery is deteriorating, continued use may cause the 12-volt battery to

emit a malodorous gas, which may be detrimental to the health of passengers.

■

When replacing the 12-volt battery

●

When the vent plug and indicator are close to the hold down clamp, the battery fluid

(sulfuric acid) may leak.

●

For information regarding 12-volt battery replacement, contact your Lexus dealer.

●

Make sure to replace the 12-volt battery with one designed for this vehicle. Other-

wise, hydrogen gas may enter the vehicle, possibly causing a fire or explosion.

●

After replacing, securely attach the exhaust hose and exhaust hole plug to the

exhaust hole of the replaced 12-volt battery. If not properly installed, gases (hydro-

gen) may leak into the vehicle interior, and there is the possible danger of the gas

igniting and exploding.

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NOTICE

■

When handling jumper cables
When connecting the jumper cables, ensure that they do not become entangled in the

cooling fans or belt.

■

To prevent damaging the vehicle
The exclusive jump starting terminal is to be used when charging the 12-volt battery

from another vehicle in an emergency. It cannot be used to jump start another vehicle.

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8-2. Steps to take in an emergency

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■

“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown on the multi-information display

Stop the vehicle in a safe place and turn off the air conditioning system, and
then stop the hybrid system.
If you see steam:

Carefully lift the hood after the steam subsides.

If you do not see steam:

Carefully lift the hood.

After the hybrid system has
cooled down sufficiently, inspect
the hoses and radiator core (radi-
ator) for any leaks.

Radiator
Cooling fans

If a large amount of coolant leaks,

immediately contact your Lexus

dealer.

The coolant level is satisfactory if
it is between the “FULL” and
“LOW” lines on the reservoir.

Reservoir
“FULL” line
“LOW” line
Radiator cap

If your vehicle overheats

The following may indicate that your vehicle is overheating.

●

The needle of the engine coolant temperature gauge (

P. 96) enters the

red zone, or a loss of hybrid system power is experienced. (For example, the
vehicle speed does not increase.)

●

“Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” or
“Hybrid System Overheated Reduced Output Power” is shown on the
multi-information display.

●

Steam comes out from under the hood.

Correction procedures

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Add coolant if necessary.

Water can be used in an emergency

if coolant is unavailable.

Start the hybrid system and turn the air conditioning system on to check
that the radiator cooling fans operate and to check for coolant leaks from
the radiator or hoses.

The fans operate when the air conditioning system is turned on immediately after a

cold start. Confirm that the fans are operating by checking the fan sound and air

flow. If it is difficult to check these, turn the air conditioning system on and off

repeatedly. (The fans may not operate in freezing temperatures.)

If the fans are not operating:
Stop the hybrid system immediately and contact your Lexus dealer.
If the fans are operating:
Have the vehicle inspected at the nearest Lexus dealer.
Check if “Engine Coolant Temp High Stop in a Safe Place See Owner’s
Manual” is shown on the multi-information display.
If the message does not disappear:
Stop the hybrid system and contact your Lexus dealer.
If the message is not displayed:
Have the vehicle inspected at the nearest Lexus dealer.

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