2015 TOYOTA 4RUNNER key battery

3796-3. Do-it-yourself maintenance
6
Maintenance and care
4RUNNER (U)_(OM35B18U)
■Use a CR2016 (vehicles without a sm art key system) or CR1632 (vehicles
with a smart key system) lithium battery
● Batteries can be purchased at your Toyota dealer, local electrical appliance
shops or camera stores.
● Replace only with the same or equivalent type recommended by the manu-
facturer.
● Dispose of used batteries according to local laws.
■ If the electronic key battery is depleted
The following symptoms may occur:
●The smart key system and wireless remote control will not function properly.
● The operational range will be reduced.
CAUTION
■Removed battery and other parts
These parts are small and if swallowed by a child, they can cause choking.
Keep away from children. Failure to do so could result in death or serious
injury.
NOTICE
■For normal operation after replacing the battery
Observe the following precautions to prevent accidents:
● Always work with dry hands.
Moisture may cause the battery to rust.
● Do not touch or move any other component inside the remote control.
● Do not bend either of the battery terminals.

399
When trouble arises7
4RUNNER (U)_(OM35B18U)7-1. Essential information
Emergency flashers .......... 400
If your vehicle has to be stopped in an
emergency ...................... 401
7-2. Steps to take in an emergency
If your vehicle needs to be towed ..................... 403
If you think something is wrong .............................. 410
Fuel pump shut off system ............................ 411
If a warning light turns on or a warning buzzer
sounds ............................ 412
If a warning message or indicator is displayed ...... 421
If you have a flat tire.......... 428
If the engine will not start ........................... 441
If the shift lever cannot be shifted from P............. 443
If you cannot operate back door opener .................... 444
If the electronic key does not operate properly........ 445
If the vehicle battery is discharged ...................... 447
If your vehicle overheats ........................ 450
If the vehicle becomes stuck ............................... 453

4267-2. Steps to take in an emergency
4RUNNER (U)_(OM35B18U)
Once
An attempt was made to start
the engine with the shift lever in
an incorrect position.
Shift the shift lever to P
and start the engine.

Power was turned off due to the
automatic power off function.
Next time when starting
the engine, increase the
engine speed slightly and
maintain that level for
approximately 5 minutes
to recharge the battery.
Once
The electronic key has a low
battery.
Replace the electronic key
battery. ( P. 378)
Once
The driver’s door was opened
and closed with the engine
switch turned off and then the
engine switch was put in
ACCESSORY or IGNITION ON
mode twice without the engine
being started.
Press the engine switch
while depressing the brake
pedal.
During an engine starting pro-
cedure in the event that the
electronic key was not function-
ing properly ( P. 445), the
engine switch was touched with
the electronic key.
 Press the engine switch
while depressing the brake
pedal within 10 seconds of
the buzzer sounding.
Interior
buzzerExterior
buzzerWarning messageDetails/Actions
(Flashes)
(Flashes)

4427-2. Steps to take in an emergency
4RUNNER (U)_(OM35B18U)
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. 447)
● There may be a malfunction in the steering lock system (vehicles
with a smart key system).
Contact your Toyota dealer if the problem cannot be repaired, or if repair
procedures are unknown.
When the engine does not start, the following steps can be used as an
interim measure to start the engine if the engine switch is functioning
normally:
Set the parking brake.
Shift the shift lever to P.
Turn the engine switch to ACCESSORY mode.
Press 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 malfunctioning. Have the v ehicle inspected by your Toyota
dealer.
The starter motor does not turn ov er, the interior lights and head-
lights do not turn on, or the horn does not sound.
Emergency start function (vehicles with a smart key system)
1
2
3
4

4457-2. Steps to take in an emergency
7
When trouble arises
4RUNNER (U)_(OM35B18U)
Use the mechanical key
( P. 92) in order to perform the
following operations:
Locks all the doors
Closes the windows and moon
roof (turn and hold)
*
(  P. 147, 154)
Unlocks all 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)*
(  P. 147, 154)
*: This setting must be customized at your Toyota dealer.
If the electronic ke y does not operate
properly (vehicles with a smar t key system)
If communication between the electronic key and vehicle is
interrupted ( P. 106) or the electronic key cannot be used
because the battery is depleted, the smart key system and wire-
less remote control cannot be used. In such cases, the doors
can be opened and the engine ca n be started by following the
procedure below.
Locking and unlocking the doors
1
2
3
4

4467-2. Steps to take in an emergency
4RUNNER (U)_(OM35B18U)
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Toyota emblem side
of the electronic key to the
engine 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 key.
Press the engine switch.
In the event that the engine still c annot be started, contact your Toyota
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. 378)
■ Changing engine switch modes
Within 10 seconds of the buzzer sounding, release the brake pedal and press
the engine switch.
The engine does not start and modes will be changed each time the switch is
pressed.( P. 195)
Starting the engine
1
2
3
CAUTION
■When using the mechanical key and operating the power windows,
power back window and moon roof
Operate the power windows, power back window or moon roof after check-
ing 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 operate the mechanical key. It is possible for
children and other passengers to get caught in power windows, power back
window and moon roof.

4487-2. Steps to take in an emergency
4RUNNER (U)_(OM35B18U)
Vehicles with a smart key system only: Open and close any of the
doors of your vehicle with the engine switch off.
Maintain the engine speed of the second vehicle and start the
engine of your vehicle by turni ng the engine switch to the “ON”
position (vehicles without a smart key system) or turning the engine
switch to IGNITION ON mode (v ehicles with a smart key system).
Once the vehicle’s engine has started, remove the jumper cables in
the exact reverse order from which they were connected.
Once the engine starts, have the vehicle inspected at your Toyota
dealer as soon as possible.
■ 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.
■ 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 cer-
tain 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 recharging or replacing the battery
●Vehicles with a smart key system: In some cases, it may not be possible to
unlock the doors using the smart key system when the battery is dis-
charged. Use the wireless remote control or the mechanical key to lock or
unlock the doors.
● The engine may not start on the first attempt after the battery has recharged
but will start normally after the second attempt. This is not a malfunction.
● Vehicles with a smart key system: The engine switch mode is memorized by
the vehicle. When the battery is reconnected, the system will return to the
mode it was in before the battery was discharged. Before disconnecting the
battery, turn the engine switch off.
If you are unsure what mode the engine switch was in before the battery dis-
charged, be especially careful when reconnecting the battery.
● Make sure that the key is not inside the vehicle when recharging or replac-
ing the battery. The key may be locked in the vehicle if the alarm is acti-
vated. ( P. 73)
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5
6

504
4RUNNER (U)_(OM35B18U)
What to do if... (Troubleshooting)
What to do if... (Troubleshooting)
●If you lose your keys or mechanical keys, new genuine mechanical keys
can be made by your Toyota dealer. (P. 93)
●If you lose your keys or electronic keys, the risk of vehicle theft increases
significantly. Contact your Toyota dealer immediately. ( P. 95)
●Is the key battery weak or depleted? (P. 377)
●Vehicles with a smart key system:
Is the engine switch in IGNITION ON mode?
When locking the doors, turn the engine switch off. ( P. 195)
●Vehicles with a smart key system:
Is the electronic key left inside the vehicle?
When locking the doors, make sure that you have the electronic key on
your person.
●The function may not operate properly due to the condition of the radio
wave. ( P. 106)
If you have a problem, check the following before contacting
your Toyota dealer.
The doors cannot be locked, unlocked, opened or closed
You lose your keys
The doors cannot be locked or unlocked