2018 LEXUS LX570 Owners Manual

5457-2. Steps to take in an emergency
LX570_OM_OM60Q78U_(U) 7
When trouble arises One of the following may be the cause of the problem: ●
One or both of the battery terminals may be disconnected. ●
The battery may be discharged. ( → P. 549)●
There may be a malfunction in the steering lock system.Contact your Lexus dealer if the problem cannot be repaired, or if repair procedures
are unknown.
When the engine does not start, the follo wing steps can be used as an interim
measure to start the engine if the engine switch is functioning normally.
Set the parking brake.
Put the shift lever in P.
Set the engine switch to the ACCESSORY mode.
Push and hold the engine switch for about 15 seconds while depressing the
brake pedal firmly.
Even if the engine can be started using the above steps, the system may be mal-
functioning. Have the vehicle in spected by your Lexus dealer.The starter motor does not turn ove r, the interior lights and headlights
do not turn on, or the horn does not sound.
Emergency start function 1
2
3
4

546
LX570_OM_OM60Q78U_(U) 7-2. Steps to take in an emergency
If the electronic key does not operate properly Use the mechanical key ( → P. 111) in
order to perform the following opera-
tions (driver’s door only):
Locks all the doors
Closes the windows and moon roof
*(turn and hold)
Unlocks the doors Turning the key rearward unlocks the
driver’s door. Turning the key once again
unlocks the other doors.
Opens the windows and moon roof
* (turn and hold)
* : These settings must be cust omized at your Lexus dealer.If communication between the electronic key and vehicle is interrupted
( → P. 134) or the electronic key ca nnot 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 engine can be started by following the procedure below.
Locking and unlocking the doors and key linked functions 1
2
3
4

5477-2. Steps to take in an emergency
LX570_OM_OM60Q78U_(U) 7
When trouble arises Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of the
electronic key to the engine switch. When the electronic key is detected, a
buzzer sounds and the engine switch
will turn to IGNITION ON mode.
When the smart access system with
push-button start is deactivated in cus-
tomization setting, the engine switch will
turn to ACCESSORY mode.
Firmly depress the brake pedal and check that is shown on the
multi-information display.
Press the engine switch. In the event that the engine still cannot be started, contact your Lexus dealer.■
Stopping the engine
Shift the shift lever to P and press the engine switch as you normally do when stopping
the engine. ■
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. 503)■
Changing engine switch modes
Release the brake pedal and press the engine switch in step above. The engine does
not start and modes will be changed e ach time the switch is pressed. ( → P. 206)■
Alarm
Using the mechanical key to lock th e doors will not set the alarm system.
If a door is unlocked using the mechanical ke y when the alarm system is set, the alarm
may be triggered. ( → P. 77)■
When the electronic key does not work properly ●
Make sure that the smart access system wi th push-button start has not been deacti-
vated in the customization setting. If it is off, turn the function on.
(Customizable features: → P. 580)●
Check if battery-saving mode is set. If it is set, cancel the function. ( → P. 134)Starting the engine 1
2
3
4
3

548 7-2. Steps to take in an emergency
LX570_OM_OM60Q78U_(U) WARNING ■
When using the mechanical key and operating the power windows or moon roof
Operate the power window or moon roof afte r checking to make sure that there is no
possibility of any passenger having any of their body parts caught in the window or
moon roof.
Also, do not allow children to op erate the mechanical key. It is possible for children and
other passengers to get caught in the power window or moon roof.

549
LX570_OM_OM60Q78U_(U) 7
When trouble arises 7-2. Steps to take in an emergency
If the vehicle battery is discharged If you have a set of jumper (or booster) cables and a second vehicle with a 12-volt
battery, you can jump start your Lexus following the steps below.
Confirm that the electronic key is
being carried.
When connecting the jumper (or
booster) cables, depending on the
situation, the alarm may activate and
doors locked. ( → P. 79)
Open the hood. Remove the engine compartment cover. ( → P. 474)
Connect the jumper cables.
Positive (+) battery terminal on your vehicle
Positive (+) battery termin al on the second vehicle
Negative (-) battery terminal on the second vehicle
Connect the jumper cable to ground on your vehicle as shown in the illus-
tration.The following procedures may be used to start the engine if the vehicle’s bat-
tery is discharged.
You can also call your Lexus dealer or qualified repair shop. 1
2
3
1
2
3
4

550 7-2. Steps to take in an emergency
LX570_OM_OM60Q78U_(U) Start the engine of the second vehicle. Increase the engine speed slightly and
maintain at that level for approximatel y 5 minutes to recharge the battery of
your vehicle.
Open and close any of the doors with the engine switch off.
Maintain the engine speed of the second vehicle and turn the engine switch to
IGNITION ON mode, then start the vehicle’s engine.
Once the vehicle’s engine has started, remove the jumper cables in the exact
reverse order in which they were connected.
Once the engine starts, have the vehicl e checked at your Lexus dealer, as soon
as possible. ■
Starting the engine when the battery is discharged
The engine cannot be started by push-starting. ■
Avoiding a discharged battery ●
Turn off the headlights and the audio system while the engine is off. ●
Turn off any unnecessary electrical componen ts when the vehicle is running at a low
speed for an extended period, such as in heavy traffic, etc. ■
Charging the battery
The electricity stored in the battery will disc harge gradually even when the vehicle is not
in use, due to natural discharge and the draini ng effects of certain electrical appliances. If
the vehicle is left for a long time, the battery may discharge, and the engine may be
unable to start. (The battery recharges automatically during driving.) ■
When the battery is removed or discharged
The power back door mu st be initialized. ( → P. 126)4
5
6
7

5517-2. Steps to take in an emergency
LX570_OM_OM60Q78U_(U) 7
When trouble arises WARNING ■
Avoiding battery fires or explosions
Observe the following precautions to preven t accidentally igniting the flammable gas
that may be emitted from the battery. ●
Make sure the jumper cable is connected to the correct terminal and that it is not
unintentionally in contact with any pa rt other than the intended terminal.●
Do not allow the jumper cables to come into contact with the “+” and “-” terminals. ●
Do not allow open flame or use matches, cigarette lighters or smoke near the battery. ■
Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while related parts
contain lead and lead compounds. Observ e the following precautions when handling
the battery. ●
When working with the battery, always wear safety glasses and take care not to allow
any battery fluids (acid) to come into cont act with skin, clothing or the vehicle body.●
Do not lean over the 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 afte r handling the battery support, terminals, and other bat-
tery-related parts. ●
Do not allow childre n near the battery.
NOTICE ■
When handling jumper cables
Be careful that the jumper cables do not be come tangled in the cooling fan or any of
the belts when connecting or disconnecting them.

552
LX570_OM_OM60Q78U_(U) 7-2. Steps to take in an emergency
If your vehicle overheats Stop the vehicle in a safe place and tu rn off the air conditioning system, and
then stop the engine.
If you see steam:
Carefully lift the hood after the steam subsides.
If you do not see steam:
Carefully lift the hood.
After the engine has cooled down suff iciently, inspect th e hoses and radiator
core (radiator) for any leaks.
Radiator
Cooling fans If a large amount of coolant leaks,
immediately contact your Lexus
dealer.The following may indicate that your vehicle is overheating. ●
The needle of the engine coolant temperature gauge ( → P. 88) enters the
red zone or a loss of engine power is experienced. (For example, the vehicle
speed does not increase.) ●
Steam is coming from under the hood.
Correction procedures 1
2
3
1
2