battery Lexus GX460 2012 Workshop Manual

676
GX460_U.S.A. (OM60J00U)
5-1. Essential information
Emergency flashers
NOTICE
■To prevent battery discharge
Do not leave the emergency flashers on longer than necessary when the engine is
not running.
Use the emergency flashers if the vehicle malfunctions or is involved in an
accident.
Press the switch to flash all the
turn signal lights. To turn them
off, push the switch once again.

5
When trouble arises
717
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)

Po w e r w a s t u r n e d
off due to the
automatic power
off function.
Next time when
starting the
engine, increase
the engine speed
slightly and main-
tain that level for
approximately 5
minutes to
recharge the bat-
tery.
Sounds
onceThe electronic key
has a low battery.Replace the elec-
tronic key battery.
(→ P. 6 4 4 )
Interior
buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure

5
When trouble arises
735
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
If the engine will not start
If the engine will not start even though correct starting procedures are
being followed (
→P. 179), consider each of the following points:
■The engine will not start even when the starter motor operates
normally
One of the following may be the cause of the problem:
● There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
● The engine may be flooded.
Try to restart the engine once more following correct starting
procedures. ( →P. 1 7 9 )
● There may be a malfunction in the engine immobilizer system.
(→ P. 115)
■ The starter motor turns over slowly, interior lights and headlights
are dim, or the horn does not sound or sounds at a low volume
One of the following may be the cause of the problem:
● The battery may be discharged. ( →P. 74 1 )
● The battery terminal connections may be loose or corroded.
■ The starter motor does not turn over
The engine starting system may be malfunctioning due to an electri-
cal problem such as an open circuit or a blown fuse. However, an
interim measure is available to start the engine. ( →P. 7 3 9 )

736
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
Emergency start function
When the engine does not start, the following steps can be used as an
interim measure to start the engine if the “ENGINE START STOP” switch
is functioning normally:Set the parking brake.
Shift the shift lever to P.
Turn the “ENGINE START STOP” switch to ACCESSORY
mode.
Press and hold the “ENGINE START STOP” 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 malfunctioning. Have the vehicle inspected by your Lexus dealer.
■ The starter motor does not turn ov er, interior lights and headlights
do not turn on, or the horn does not sound
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. 74 1 )
● 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.
STEP1
STEP2
STEP3
STEP4

5
When trouble arises
739
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
If the electronic key does not operate properly
Locking and unlocking the doors and key linked functions
Use the mechanical key ( →P. 2 6 )
in order to perform the following
operations (driver’s door only):
Locks all the doors
Closes the windows and moon
roof (turn and hold)
*
Unlocks the door
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)
*
*
: This setting must be customized at your Lexus dealer.
If communication between the electronic key and vehicle is interrupted
(→ P. 39) 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 or
the engine can be started by following the procedure below.

740
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
Changing “ENGINE START STOP” switch modes and starting the engine
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 START STOP” switch.
If any of the doors is opened or
closed while the key is being
touched to the switch, an alarm will
sound to indicate that the start
function cannot detect the elec-
tronic key.
To change “ENGINE START ST OP” switch modes: Within 10
seconds of the buzzer sounding, release the brake pedal and
press the “ENGINE START STOP” switch. Modes can be
changed each time the switch is pressed. ( →P. 1 8 1 )
To start the engine: Press the “ENGINE START STOP” switch
within 10 seconds of the buzzer sounding, keeping the brake
pedal depressed.
In the event that the “ENGINE START STOP” switch still cannot be oper-
ated, contact your Lexus dealer.
STEP1
STEP2
■Stopping the engine
Shift the shift lever to P and press the “ENGINE START STOP” switch as you nor-
mally do when stopping the engine.
■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. 6 4 4 )
STEP3

5
When trouble arises
741
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
If the vehicle battery is discharged
The following procedures may be used to start the engine if the vehicle’s
battery is discharged.
You can call your Lexus dealer, or qualified repair shop.
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 by following the
steps below.
Open the hood. ( →P. 6 0 8 )
Connecting the jumper cables according to the following procedure: Positive (+) battery terminal on your vehicle.
Positive (+) battery terminal on the second vehicle.
Negative (-) battery terminal on the second vehicle.
Connect the jumper cable to ground on your vehicle as shown in the
illustration.
STEP1
STEP2

742
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
■Starting the engine when the battery is discharged
The engine cannot be started by push-starting.
■To prevent battery discharge
●Turn off the headlights and the audio system while the engine 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, etc.
■Charging the battery
The electricity stored in the battery will discharge gradually even when the vehicle
is not in use, due to natural discharge and the draining 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.)
Start the engine of the second vehicle. Increase the engine
speed slightly and maintain at that level for approximately 5
minutes to recharge the battery of your vehicle.
Open and close any of the doors of your vehicle with the
“ENGINE START STOP” switch off.
Maintain the engine speed of the second vehicle and start the
engine of your vehicle by turning the “ENGINE START STOP”
switch to IGNI TION ON mode.
Once your vehicle’s engine has started, remove the jumper
cables in the exact reverse order in which they were con-
nected.
Once the engine starts, have the vehicle checked at your Lexus dealer
as soon as possible.STEP3
STEP4
STEP5
STEP6

5
When trouble arises
743
5-2. Steps to take in an emergency
GX460_U.S.A. (OM60J00U)
CAUTION
■Avoiding battery fires or explosions
Observe the following precautions to prevent 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 part other than the intended terminal.
●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 bat-
tery.
■Battery precautions
The battery contains poisonous and corrosive acidic electrolyte, while related parts
contain lead and lead compounds. Observe the following precautions when han-
dling the battery:
●When working with the battery, always wear safety glasses and take care not to
allow any battery fluids (acid) to come into contact with skin, clothing or the vehi-
cle body.
●Do not lean over the battery.
●If the 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 battery support, terminals, and other
battery-related parts.
●Do not allow children near the battery.
NOTICE
■When handling jumper cables
When connecting the jumper cables, ensure that they do not become entangled in
the cooling fans or belt.

758
6-1. Specifications
GX460_U.S.A. (OM60J00U)
Electrical system
Front differential
*: Your Lexus vehicle is filled with “Toyota Genuine Differential Gear Oil” at the
factory.
Use Lexus approved “Toyota Genuine Differential Gear Oil” or an equivalent of
matching quality to satisfy the above specification. Please contact your Lexus
dealer for further details.
Battery
Open voltage* at
68 °F (20 °C):12.6  12.8 V Fully charged
12.2  12.4 V Half charged
11.8  12.0 V Discharged
(
*: Voltage is checked 20 minutes after the
engine and all the lights are turned off.)
Charging rates5A max.
Oil capacity1.48 qt. (1.40 L, 1.23 Imp.qt.)
Oil type and viscosity*Toyota Genuine Differential
Gear Oil LT 75W-85 GL5 or equivalent