2015 LEXUS RX450h battery

6994-3. Do-it-yourself maintenance
4
Maintenance and care
■ Engine compartment (type C fuse box) 49
BIXENON 10 A50
H-LP RH LO 15 A Right-hand headlight (low beam)51
H-LP LH LO 15 A Left-hand headlight (low beam)52
HORN 10 A Horn53
A/F 20 A Multiport fuel injection system/
sequential multiport fuel injection sys-
tem54
S-HORN 7. 5 A S-HORN
Fuse Ampere Circuit1
ABS MAIN NO. 1 10 A Brake system
2
ABS MAIN
NO. 2 10 A Brake system
3
BATT FAN 15 A Battery cooling fan
4
OIL PMP 10 A Hybrid system
5
A/C W/P 10 A Air conditioning systemFuse Ampere Circuit

When trouble arises
5
7235-1. Essential information
Emergency flashers............... 724
If your vehicle needs to be
towed ...................................... 725
If you think something is
wrong ...................................... 732 5-2. Steps to take in an
emergency
If a warning light turns on
or a warning buzzer
sounds... ................................. 733
If a warning message is
displayed................................. 743
If you have a flat tire................ 764
If the hybrid system will
not start ................................... 777
If the shift lever cannot be
shifted from P ........................ 779
If you lose your keys .............. 780
If the electronic key does
not operate properly........... 781
If the vehicle 12-volt
battery is discharged ......... 784
If your vehicle overheats ..... 788
If the vehicle becomes
stuck........................................ 793
If your vehicle has to
be stopped in an
emergency ............................ 795

7245-1. Essential information
Emergency flashers
■
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.The emergency flashers are used to warn other drivers when the vehicle
has to be stopped in the road due to a breakdown, etc.
Press the switch. All the turn signal lights will flash.
To turn them off, press the switch
once again.

7385-2. Steps to take in an emergency
■
If the malfunction indicator lamp comes on while driving
First check the following: ●
Is the fuel tank empty?
If it is, fill the fuel tank immediately.●
Is the fuel tank cap loose?
If it is, tighten it securely.
The lamp will go off after several driving trips.
If the light does not go off even after several trips, contact your Lexus dealer as soon
as possible.■
SRS warning light
This warning light system monitors the airb ag sensor assembly, front airbag sensors,
side and curtain shield airbag sensors, curtain shield and rear side airbag sensors,
door sensors, driver's seat position sensor, driver's seat belt buckle switch, front
passenger occupant classification system (ECU and sensors), “AIR BAG ON” indi-
cator light, “AIR BAG OFF” in dicator light, front pass enger's seat belt buckle
switch, seat belt pretensioner assemblies, inflators, interconnecting wiring and
power sources. (  P. 1 3 2 )■
Front passenger detection sensor, passen ger seat belt reminder and warning
buzzer ●
If luggage is placed on the front passenger seat, the front passenger detection
sensor 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 or the voltage temporarily
drops, the electric power steering system warning light may come on and the warn-
ing buzzer may sound.
■
When the tire pressure warning light comes on
Check the tire inflation pressure and adjust to the appropriate level. Pushing the tire
pressure warning reset switch will not turn off the tire pressure warning light.

5
When trouble arises
7535-2. Steps to take in an emergency
Indicates that the hybrid
system has overheated
A buzzer also sounds.
This message may be
displayed when driving
under severe operating
conditions. (For exam-
ple, when driving up a
long steep hill.) Stop and check.
(  P. 7 8 8 )
(Flashes) Indicates that the hybrid
battery (traction battery)
is low. • If a buzzer sounds inter-
mittently, stop the vehicle
in a safe place and shift
the shift lever to P to
charge the hybrid bat-
tery (traction battery).
• If a buzzer sounds con-
tinuously, immediately
stop the vehicle in a safe
place. Turn the
“POWER” switch off and
then to ON mode to
restart the hybrid system.
Ensuring the shift lever is
in P, charge the hybrid
battery (traction bat-
tery).
Indicates that remaining
fuel is approximately 2.7
gal. (10.1 L, 2.2 Imp. gal.)
or less Refuel the vehicle.Wa r n i n g m e s s a g e Details Correction procedure

5
When trouble arises
7615-2. Steps to take in an emergency
Sounds
once 
(Flashes) An attempt was
made to turn the
“POWER” switch
off when the shift
lever was not in P. To turn off the
hybrid system,
first shift the shift
lever to P and
then turn the
“POWER” switch
off.
  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 hybrid
system, increase
the hybrid system
speed slightly and
maintain that level
for approximately
5 minutes to
recharge the 12-
volt battery.
Sounds
once  The electronic key
has a low battery. Replace the elec-
tronic key battery.
(  P. 6 8 7 )Interior
buzzer Exterior
buzzer Wa r n i n g m e s s a g e Details Correction
procedure

5
When trouble arises
7775-2. Steps to take in an emergency
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 even though the correct starting
procedure is being followed. (  P. 1 7 7 )
One of the following may be the cause of the problem:
● The electronic key may not be functioning properly. (  P. 7 8 2 )
● There may be a malfunction in the immobilizer system. (  P. 1 2 4 )
● There may be a malfunction in the steering lock system.
● The hybrid system may be malfunc tioning due to an electrical
problem such as an open circ uit or a blown fuse. However,
depending on the type of malfunc tion, an interim measure is avail-
able to start the hybrid system. (  P. 7 7 8 )
■ The 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 12-volt battery may be discharged. (  P. 7 8 4 )
● The 12-volt battery terminal co nnections may be loose or cor-
roded.
■ The 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 12-volt battery terminals may be discon-
nected.
● The 12-volt battery may be discharged. (  P. 7 8 4 )
Contact your Lexus dealer if the problem cannot be repaired, or if
repair procedures are unknown.

5
When trouble arises
7815-2. Steps to take in an emergency
If the electronic key do es not operate properly
Locking and unlocking the side doors and key linked functions
Use the mechanical key (  P. 5 2 )
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)If communication between the electron ic key and vehicle is interrupted
(  P. 62) 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 and
the hybrid system can be started by following the procedure below.