2016 LEXUS RX450H key battery

506 6-3. Do-it-yourself maintenance
RX450h_U_OM0E013U ●
Flathead screwdriver ●
Lithium battery CR2032
Take out the mechanical key.
Remove the cover. To prevent damage to the key, cover the
tip of the flathead screwdriver with a
tape.
Remove the depleted battery. Insert a new battery with the “+” termi-
nal facing up.Electronic key battery Replace the battery with a new one if it is depleted.
You will need the following items:
Replacing the battery 1
2
3

5076-3. Do-it-yourself maintenance
6
Maintenance and care
RX450h_U_OM0E013U ■
Use a CR2032 lithium battery ●
Batteries can be purchased at your Lexus dealer, local electrical appliance shops or
camera stores. ●
Replace only with the same or equivalent type recommended by the manufacturer. ●
Dispose of used batteries according to the local laws. ■
If the electronic key battery is depleted
The following symptoms may occur: ●
The smart access system with push-button start and wireless remote control will not
function properly. ●
The operational range will be reduced.
WA R N I N G ■
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 afte r 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.

527
7When trouble arises
RX450h_U_OM0E013U 7-1. Essential information
Emergency flashers .................. 528
If your vehicle has to be
stopped in an
emergency................................. 529
7-2. Steps to take in an
emergency
If your vehicle needs to be
towed ...........................................530
If you think something is
wrong ........................................... 535
If a warning light turns
on or a warning buzzer
sounds.......................................... 536
If a warning message is
displayed..................................... 543
If you have a flat tire................... 549
If the hybrid system will not
start .................................................561
If the shift lever cannot be
shifted from P............................ 563
If the electronic key does
not operate properly ............. 564
If the 12-volt battery is
discharged .................................568
If your vehicle overheats .......... 574
If the vehicle becomes
stuck ............................................. 578

544 7-2. Steps to take in an emergency
RX450h_U_OM0E013U * : A buzzer sounds the first time a message is shown on the multi-information display.
●
If the following messages are shown, there may be a malfunction.
Immediately stop the vehicle in a safe place and contact your Lexus dealer.
Continuing to drive the vehicle may be dangerous.
• “Braking Power Low Stop in a Safe Place See Owner’s Manual”
• “Oil Pressure Low Stop in a Safe Place See Owner’s Manual”
• “Charging System Malfunction See Owner’s Manual” ●
If the following messages are shown, there may be a malfunction.
Immediately have the vehicle inspected by your Lexus dealer.
• “Hybrid System Malfunction”
•“Check Engine”
• “Hybrid Battery System Malfunction”
• “Accelerator System Malfunction”
• “Access System with Elec. Key Malfunction See Owner’s Manual” ●
If “Engine Coolant Temp High Stop in a Safe Place See Owner’s Manual” is
shown, following the instructions, accordingly. (  P. 5 74 )Flashes  Sounds Indicates a situation, such as when
damage to the vehicle or danger may
result
Comes
on  Does not sound Indicates a condition, such as malfunc-
tion of electrical components, their
condition, or indicates the need for
maintenance
Flashes  Does not sound Indicates a situation, such as when an
operation has been performed incor-
rectly, or indicates how to perform an
operation correctly
If a message instructing to refer to the Owner’s Manual is displayed System
warning
light Wa r n i n g b u z z e r
* Wa r n i n g

546 7-2. Steps to take in an emergency
RX450h_U_OM0E013U ■
If “Shift Is in N Release Accelerator Before Shifting” is shown
Message is displayed when the acceler ator pedal has been depressed and
the shift lever is in N. Release the accelerator pedal and shift the shift lever to
D or R. ■
If “Depress Brake when Vehicle Is Stopped Hybrid System May Overheat”
is shown
Message is displayed when the accelerator pedal is depressed to maintain the
vehicle position when stopped on a upward slope, etc.
If this continues, the hybrid system may overheat.
Release the accelerator pedal and depress the brake pedal. ■
If “Power Turned Off to Save Battery” is displayed
This message is displayed when the power was cut off due to the automatic
power off function.
The next time the hybrid system is star ted, increase the engine speed slightly
and maintain it at that speed for appr oximately 5 minutes to recharge the 12-
volt battery. ■
If “A New Key has been Registered Contact Your Dealer for Details” is dis-
played
This message will be displayed each time the driver's door is opened when the
doors are unlocked from the outside for approximately one week after a new
electronic key has been registered.
If this message is displayed but you have not had a new electronic key regis-
tered, ask your Lexus dealer to check if an unknown electronic key (other than
those in your possession) has been registered. ■
When “Headlight System Malfunctio n Visit Your Dealer” is displayed
The following systems may be malfunct ioning. Have the vehicle inspected by
your Lexus dealer immediately. ●
The LED headlight system ●
The automatic headlight leveling system ●
Automatic High Beam (if equipped) ●
AFS (Adaptive Front-lighting System) (if equipped)

5617-2. Steps to take in an emergency
7
When trouble arises
RX450h_U_OM0E013U One of the following may be the cause of the problem: ●
The electronic key may not be functioning properly.
(  P. 5 6 4 )●
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 5 )●
There may be a malfunction in the steering lock system. ●
The hybrid system may be malfunctioni ng due to an electrical problem such
as electronic key battery depletion or a blown fuse. However, depending on
the type of malfunction, an interim meas ure is available to start the hybrid sys-
tem. (  P. 5 6 2 )
One of the following may be the cause of the problem: ●
The 12-volt battery may be discharged. (  P. 5 6 8 )●
The 12-volt battery terminal connections may be loose or corroded.
(  P. 4 8 3 )If the hybrid system will not start Reasons for the hybrid system not starting vary depending on the situation.
Check the following and perform the appropriate procedure:
The hybrid system will not start ev en though the correct starting proce-
dure is being followed. (  P. 2 3 2 )
The interior lights and headlights are dim, or the horn does not sound or
sounds at a low volume.

564 7-2. Steps to take in an emergency
RX450h_U_OM0E013U ■
Unlocking the door
Use the mechanical key (  P. 133) in order to perform the following opera-
tions:
Insert the mechanical key while
pulling on the driver’s door han-
dle.
Unlocking the door. Turning the key rearward unlocks the
driver’s door. Turning the key again
unlocks the other doors.
Remove the key, return the handle, and then pull the handle again.If the electronic key do es not operate properlyIf communication between the electron ic key and vehicle is interrupted
(  P. 160) 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 hybrid system can be started by following the procedure below.
Locking and unlocking the doors 1
2
3

5677-2. Steps to take in an emergency
7
When trouble arises
RX450h_U_OM0E013U ■
Stopping the hybrid system
Shift the shift lever to P, set the parking brake, and press the power switch as you normally
do when stopping the hybrid system. ■
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. 5 0 6 )■
Changing power switch modes
Release the brake pedal and press the power switch in step above.
The hybrid system does not start and mode s will be changed each time the switch is
pressed. (  P. 2 3 3 )■
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 custom ization setting. If it is off, turn the function on.
(Customizable features  P. 6 1 0 )●
Check if battery-saving mo de is set. If it is se t, cancel the function. (  P. 1 6 0 )
WA R N I N G ■
When using the mechanical key and operating the power windows or the moon roof
or panoramic moon roof
Operate the power window or the moon roof or panoramic moon roof after checking
to make sure that there is no possibility of any passenger ha ving any of their body parts
caught in the window or the moon roof or panoramic moon roof.
Also, do not allow children to operate the mech anical key. It is possible for children and
other passengers to get caught in the powe r window or the moon roof or panoramic
moon roof. 3