battery LEXUS LS600H 2017 Repair Manual

5386-3. Do-it-yourself maintenance
LS600h/LS600hL_EE(OM50G20E)
Trunk (type A fuse box)
Remove the 12-volt battery cover
( P. 502) and then remove the
lid.
Trunk (type B fuse box)
Remove the cover.
Trunk (type C fuse box)
Remove the 12-volt battery cover
( P. 502) and then remove the
terminal cover.
Remove the fuse with the pullout
tool.
Only type A fuse can be removed
using the pullout tool.
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545
7When trouble arises
LS600h/LS600hL_EE(OM50G20E)
7-1. Essential information
Emergency flashers ..................546
If your vehicle has
to be stopped
in an emergency ...................... 547
7-2. Steps to take
in an emergency
If your vehicle needs
to be towed ............................... 548
If you think something
is wrong .......................................554
If a warning light turns
on or a warning buzzer
sounds......................................... 555
If a warning message
is displayed.................................563
If you have a flat tire
(vehicles with
a spare tire)................................ 567
If you have a flat tire
(vehicles without
a spare tire)................................ 578
If the hybrid system
will not start................................ 597
If the parking brake
cannot be released................. 599
If the electronic key does
not operate properly .............603
If the 12-volt battery
is discharged............................. 607
If your vehicle overheats ............ 611
If the vehicle becomes
stuck ...............................................616

546
LS600h/LS600hL_EE(OM50G20E)
7-1. Essential information
Press the switch.
All the turn signals 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 hybrid system is not
operating (while the “READY” indicator is not illuminated), the 12-volt battery may
discharge.
Emergency flashers
The emergency flashers are used to warn other drivers when the vehi-
cle has to be stopped in the road due to a breakdown, etc.

5607-2. Steps to take in an emergency
LS600h/LS600hL_EE(OM50G20E)
■Front passenger detection sensor, seat belt reminder and warning buzzer
●If luggage is placed on the front passenger seat, the front passenger detection sen-
sor may cause the warning light to flash and the warning buzzer to sound even if a
passenger is not sitting in the seat.
●If a cushion is placed on the seat, the sensor may not detect a passenger, and the
warning light may not operate properly.
■Electric power steering system warning light (warning buzzer)
When the 12-volt battery charge becomes insufficient of the voltage temporarily
drops, the electric power steering system warning light may come on and the warn-
ing buzzer may sound.
■If the malfunction indicator lamp comes on while driving
The malfunction indicator lamp will come on if the fuel tank becomes completely
empty. If the fuel tank is empty, refuel the vehicle immediately. The malfunction indi-
cator lamp will go off after several trips.
If the malfunction indicator lamp does not go off, contact any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional as soon as
possible.
■When the tire pressure warning light comes on
Carry out the following procedure after the tire temperature has lowered sufficiently.
●Check the tire inflation pressure and adjust it to the appropriate level.
●If the warning light does not go out after several minutes, check that the tire infla-
tion pressure is at the specified level and carry out initialization.
The warning light may come on again if the above operations are conducted without
first allowing the tire temperature to lower sufficiently.
■The tire pressure warning light may come on due to natural causes
The tire pressure warning light may come on due to natural causes such as natural
air leaks and tire inflation pressure changes caused by temperature. In this case,
adjusting the tire inflation pressure will turn off the warning light (after a few minutes).

5977-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
One of the following may be the cause of the problem:
●The electronic key may not be functioning properly. (P. 605)
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
●There may be a malfunction in the immobilizer system. ( P. 96)
●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 system. ( P. 598)
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 607)
●The 12-volt battery terminal connections may be loose or corroded.
If the hybrid system will not start
Reasons for the hybrid system not starting vary depending on the situa-
tion. Check the following and perf orm the appropriate procedure:
The hybrid system will not start even though the correct starting
procedure is being followed. ( P. 247)
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.

5987-2. Steps to take in an emergency
LS600h/LS600hL_EE(OM50G20E)
One of the following may be the cause of the problem:
●One or both of the 12-volt battery terminals may be disconnected.
●The 12-volt battery may be discharged. (P. 607)
Contact any authorized Lexus dealer or repairer, or another duly qualified and
equipped professional 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 func-
tioning normally:
Turn the power switch to ON mode ( P. 248) and check that the
parking brake is set.
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 star ted using the above steps, the system
may be malfunctioning. Have the vehicle inspected by any authorized
Lexus dealer or repairer, or another duly qualified and equipped profes-
sional.
The interior lights and headlights do not turn on, or the horn does
not sound.
Emergency start function
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5997-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
●Shift the shift lever to P.
●Turn the power switch off.
●Check that the parking brake indicator is off.
●Chock the tires.
Vehicles with a spare tire
Take out the parking brake release tool and the screwdriver from the
trunk. ( P. 568)
Replace the screwdriver head
with the parking brake release
tool.
Take out the spare tire. ( P. 571)
If the parking brake cannot be released
In the event that the 12-volt battery is discharged or switch operation
does not release the parking brake, the parking brake can be released
manually using the procedure below. This procedure should be per-
formed only if necessary, su ch as in an emergency.
If the switch cannot be operated ev en when the 12-volt battery is nor-
mal, the parking brake system may be malfunctioning. Have the vehicle
inspected by any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional immediately.
Before releasing the parking brake manually
Releasing the parking brake manually
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6037-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
Use the mechanical key built in to the electronic keys to operate the
doors. ( P. 141)
Vehicles with an alarm: An alarm will sound if the alarm is set when the trunk or
doors are unlocked. ( P. 103)
■Doors
Remove the cover on the
driver’s door handle.
If the electronic key does not operate properly
If communication between the electronic key and vehicle is inter-
rupted ( P. 159) or the electronic key cannot be used because the
battery is depleted, the smart entry & start system and wireless remote
control cannot be used. In such cases, the doors and trunk can be
opened and the hybrid system can be started by following the proce-
dure below.
Locking and unlocking the doors, unlocking the trunk and key
linked functions
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6057-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
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.
If any of the doors is opened or closed
after the key was touched to the
switch to start the vehicle, an alarm
will sound to indicate that the start
function cannot detect the key.
Press the power switch within 10 seconds of the buzzer sounding,
keeping the brake pedal depressed.
In the event that the hybrid system still cannot be started, contact any
authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
■Stopping the hybrid system
Shift the shift lever to P and press the power switch as you normally do when stop-
ping the hybrid system.
■Replacing the key battery
As the above procedure is a temporary measure, it is recommended that the elec-
tronic key battery be replaced immediately when the battery is depleted. ( P. 532)
■Alarm (if equipped)
Using the mechanical key to lock the doors will not set the alarm system.
If a door is unlocked using the mechanical key when the alarm system is set, the
alarm may be triggered.
■Changing power switch modes
Within 10 seconds of the buzzer sounding, release the brake pedal and press the
power switch.
The hybrid system does not start and modes will be changed each time the switch is
pressed. ( P. 248)
Starting the hybrid system
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6077-2. Steps to take in an emergency
7
When trouble arises
LS600h/LS600hL_EE(OM50G20E)
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 sit-
uation, the alarm may activate and
doors locked. (P. 105)
Open the trunk lid and remove the 12-volt battery cover. ( P. 502)
In the event that the trunk opener cannot be used, use the mechanical key to open
the trunk. ( P. 603)
If the 12-volt battery is discharged
The following procedures may be used to start the hybrid system if the
12-volt battery is discharged.
You can also call any authorized Lexus dealer or repairer, or another
duly qualified and equipped professional.
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