2013 Lexus ES300h key battery

799
ES350 300h_OM_OM33A01U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If the hybrid system will not start (hybrid vehicles)
One of the following may be the cause of the problem:
●The electronic key may not be functioning properly. (P. 8 0 3 )
●There may not be sufficient fuel in the vehicle’s tank.
Refuel the vehicle.
●There may be a malfunction in the immobilizer system. ( P. 8 2 )
●There may be a malfunction in the steering lock system.
●The hybrid system may be malfunctio ning due to an electrical problem
such as electronic key battery de pletion or a blown fuse. However,
depending on the type of malfuncti on, an interim measure is available
to start the hybrid system. ( P. 800)
One of the following may be the cause of the problem:
●The 12-volt battery may be discharged. ( P. 8 0 9 )
●The 12-volt battery terminal connecti ons may be loose or corroded.
Reasons for the hybrid system not st arting 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. 2 0 4 )
The interior lights and headlights are dim, or the horn does not
sound or sounds at a low volume.

802
ES350 300h_OM_OM33A01U_(U)
7-2. Steps to take in an emergency
If the electronic key does not operate properly
■Doors
Use the mechanical key
(P. 120) in order to perform
the following operations:
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 within 5 seconds
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 ele ctronic key and vehicle is inter-
rupted ( P. 130) 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 us ed. In such cases, the doors and
trunk can be opened and the engine can be started by
following the procedure below.
Locking and unlocking the doors, unlocking the trunk and key
linked functions
1
2
3
4

8047-2. Steps to take in an emergency
ES350 300h_OM_OM33A01U_(U)
■Stopping the engine
Shift the shift lever to P and press the “START STOP ENGINE” <“POWER”> 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 elec-
tronic key battery be replaced immediately when the battery is depleted. ( P. 7 1 0 )
■Changing “START STOP ENGINE” <“POWER”> switch modes
Release the brake pedal and press the “START STOP ENGINE” <“POWER”> switch
in step above.
The engine does not start and modes will be changed each time the
switch is pressed. ( P. 198, 205)
■When the electronic key does not work properly
●Make sure that the smart access system with push-button start has not been deac-
tivated in the customization setting. If it is off, turn the function on.
(Customizable features  P. 8 5 2 )
●Check if battery-saving mode is set. If it is set, cancel the function. ( P. 1 2 9 )
3

8077-2. Steps to take in an emergency
ES350 300h_OM_OM33A01U_(U)
7
When trouble arises
■When recharging or replacing the 12-volt battery
●Make sure the key is not inside the vehicle when recharging or replacing the 12-volt
battery to prevent the doors from being locked with the key left inside the vehicle
when the alarm operates.
●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 wire-
less remote control or the mechanical key to lock or unlock the doors.
●The engine may not start on the first atte mpt after the 12-volt battery has recharged
but will start normally after the second attempt. This is not a malfunction.
●The “START STOP ENGINE” 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 “START STOP ENGINE” switch off.
If you are unsure what mode the “START STOP ENGINE” switch was in before the
12-volt battery discharged, be especially careful when reconnecting the 12-volt
battery.
CAUTION
■Avoiding 12-volt battery fires or explosions
Observe the following precautions to prev ent 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.

809
ES350 300h_OM_OM33A01U_(U)
7
When trouble arises
7-2. Steps to take in an emergency
If the 12-volt battery is discharged (hybrid vehicles)
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.
Open the trunk lid and remove the 12-volt battery cover.
( P. 6 9 0 )
In the event that the trunk opener cannot be used, use the mechanical key to open
the trunk. ( P. 8 0 2 )
Connect the jumper cables according to the following procedure:
The following procedures may be used to start the hybrid system if the
12-volt battery is discharged.
You can also call your Lexus dealer or a qualified repair shop.
1
2

8117-2. Steps to take in an emergency
ES350 300h_OM_OM33A01U_(U)
7
When trouble arises
■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.
■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 elec-
trical appliances. If the vehicle is left for a long time, the 12-volt battery may dis-
charge, and the hybrid system may be unable to start. (The 12-volt battery recharges
automatically while the hybrid system is operating.)
■When recharging or replacing the 12-volt battery
●Make sure the key is not inside the vehicl e when recharging or replacing the 12-volt
battery to prevent the doors from being locked with the key left inside the vehicle
when the alarm operates.
●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 wire-
less remote control or the mechanical key to lock or unlock the doors.
●The hybrid system may not start on the fir st 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 bat-
tery was discharged. Before disconnectin g 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
discharged, be especially careful when reconnecting the 12-volt battery.

882What to do if... (Troubleshooting)
ES350 300h_OM_OM33A01U_(U)
What to do if... (Troubleshooting)
●If you lose your mechanical keys, new genuine mechanical keys
can be made by your Lexus dealer. ( P. 121)
●If you lose your electronic ke ys, the risk of vehicle theft
increases significantly. Contact your Lexus dealer immediately.
( P. 122)
●Is the electronic key battery weak or depleted? ( P. 710)
●Is the “START STOP ENGINE” <“POWER”> switch in IGNI-
TION ON mode?
When locking the doors, turn the “START STOP ENGINE”
<“POWER”> switch off. ( P. 1 9 8 , 2 0 5 )
●Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the elec-
tronic key on your person.
●The function may not operate pr operly due to the condition of
the radio wave. ( P. 130)
If you have a problem, check the following before contacting your
Lexus dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked

884What to do if... (Troubleshooting)
ES350 300h_OM_OM33A01U_(U)●
Did you press the “START STOP ENGINE” <“POWER”>
switch while firmly depressing the brake pedal? (
P. 1 9 7 , 2 0 4 )
●Is the shift lever in P? ( P. 200, 207)
●Is the electronic key anywhere detectable inside the vehicle?
( P. 1 2 6 )
●Is the steering wheel unlocked? ( P. 201, 208)
●Is the electronic key battery weak or depleted?
In this case, the engine can be started in a tem-
porary way. ( P. 803)
●Is the 12-volt battery discharged? ( P. 805, 809)
●Is the “START STOP ENGINE” <“POWER”> switch in IGNI-
TION ON mode?
If you cannot release the shift lever by depressing the brake
pedal with the “START STOP ENGINE” <“POWER”> switch in
IGNITION ON mode ( P. 8 0 1 )
If you think something is wrong
The engine does not start
The shift lever cannot be shifted from P even if you depress the
brake pedal