2015 LEXUS RX450h brake

7625-2. Steps to take in an emergency
Sounds
once 
(Flashes) The driver's door
was opened and
closed with the
“POWER” switch
turned off and
then the
“POWER” switch
was put in
ACCESSORY
mode twice with-
out the hybrid sys-
tem being started. Press the
“POWER” switch
while depressing
the brake pedal.
During an hybrid
system starting
procedure in the
event that the
electronic key was
not functioning
properly
(  P. 7 8 2 ) , t h e
“POWER” switch
was touched with
the electronic key. Press the
“POWER” switch
within 10 seconds
of the buzzer
sounding.
Sounds
once 
(Flashes) The steering lock
could not be
released within 3
seconds of the
“POWER” switch
being pressed. Press the
“POWER” switch
while depressing
the brake pedal
and moving the
steering wheel left
and right.Interior
buzzer Exterior
buzzer Wa r n i n g m e s s a g e Details Correction
procedure

7645-2. Steps to take in an emergency
If you have a flat tire Your vehicle is equipped with a spare ti re. The flat tire can be replaced with
the spare tire.
■ Before jacking up the vehicle
● Stop the vehicle on a hard, flat surface.
● Set the parking brake.
● Shift the shift lever to P.
● Stop the hybrid system.
● Turn on the emergency flashers.

7745-2. Steps to take in an emergency
CAUTION■
Replacing a flat tire ●
Observe the following precautions.
Failure to do so may result in serious injury:
• Do not touch the disc wheels or the ar ea around the brakes immediately after
the vehicle has been driven.
After the vehicle has been driven the disc wheels and the area around the
brakes will be extremely hot. Touching these areas with hands, feet or other
body parts while changing a tire, etc. may result in burns.
• Do not attach a heavily damaged wheel ornament, as it may fly off the wheel
while the vehicle is moving.●
Failure to follow these precautions could cause the wheel nuts to loosen and the
tire to fall off, resulting in death or serious injury.
• Never use oil or grease on the wheel bolts or wheel nuts.
Oil and grease may cause the wheel nuts to be excessively tightened, leading
to bolt or disc wheel damage. In addition, the oil or grease can cause the
wheel nuts to loosen and the wheel may fall off, causing a serious accident.
Remove any oil or grease from the wheel bolts or wheel nuts.
• Have the wheel nuts tightened with a to rque wrench to 76 ft•lbf (103 N•m,
10.5 kgf•m) as soon as possible after changing wheels.
• When installing a tire, only use whee l nuts that have been specifically
designed for that wheel.
• If there are any cracks or deformations in the bolt screws, nut threads or bolt
holes of the wheel, have the vehicle inspected by your Lexus dealer.■
Replacing a flat tire for ve hicles with power back door
In cases such as when replacing tires, make sure to turn off the power back door
main switch (  P. 77). Failure to do so may cause the back door to operate uninten-
tionally if the power back door switch is accidentally touched, resulting in hands and
fingers being caught and injured.

5
When trouble arises
7755-2. Steps to take in an emergency
CAUTION■
When using the compact spare tire ●
Remember that the compact spare tire prov ided is specifically designed for use
with your vehicle. Do not use your compact spare tire on another vehicle.●
Do not use more than one compact spare tire simultaneously.●
Replace the compact spare tire with a standard tire as soon as possible.●
Avoid sudden acceleration, abrupt steeri ng, sudden braking and shifting opera-
tions that cause sudden engine braking.■
When the compact spare tire is attached
The vehicle speed may not be correctly detected, and the following systems may
not operate correctly: ●
ABS & Brake assist●
VSC●
TRAC●
VDIM●
Intuitive parking assist (if equipped)●
Navigation system (if equipped)●
Cruise control (if equipped)●
Dynamic radar cruise control (if equipped)●
Pre-Collision System (if equipped)
Also, not only can the following system not be utilized fully, but it may even nega-
tively affect the drive-train components: ●
AWD system (if equipped)■
Speed limit when using the compact spare tire
Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is
installed on the vehicle.
The compact spare tire is not designed for driving at high speeds. Failure to observe
this precaution may lead to an accident causing death or serious injury.

7785-2. Steps to take in an emergency
Emergency start function
When the hybrid system does not start, the following steps can be used as
an interim measure to start the hybr id system if the “POWER” switch is
functioning normally:
Set the parking brake.
Shift the shift lever to P.
Turn the “POWER” switch to ACCESSORY mode.
Press and hold the “POWER” swit ch for about 15 seconds while
depressing the brake pedal firmly.
Even if the hybrid system can be star ted using the above steps, the system
may be malfunctioning. Have the vehi cle inspected by your Lexus dealer.STEP 1
STEP 2
STEP 3
STEP 4

5
When trouble arises
7795-2. Steps to take in an emergency
If the shift lever cannot be shifted from P If the shift lever cannot be shifted with your foot on the brake pedal, there
may be a problem with the shift lock system (a system to prevent accidental
operation of the shift lever). Have the vehicle inspected by your Lexus
dealer immediately.
The following steps may be used as an emergency measure to ensure that
the shift lever can be shifted:
Set the parking brake.
Turn the “POWER” switch to ACCESSORY mode.
Depress the brake pedal.
Pry the cover up with a flathead
screwdriver or equivalent.
Press the shift lock override but-
ton. The shift lever can be shifted
while the button is pressed.STEP 1
STEP 2
STEP 3
STEP 4
STEP 5

7825-2. Steps to take in an emergency
Starting the hybrid system
Ensure that the shift lever is in P and depress the brake pedal.
Touch the Lexus emblem side of
the electronic key to the
“POWER” 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.
Press the “POWER” switch within 10 seconds of the buzzer
sounding, keeping the brake pedal depressed.
In the event that the hybrid system still cannot be operated, contact your
Lexus dealer. STEP 1
STEP 2
STEP 3

5
When trouble arises
7835-2. Steps to take in an emergency
■
Stopping the hybrid system
Shift the shift lever to P 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 elec-
tronic key battery be replaced immediately when the battery is depleted.
(  P. 6 8 7 )■
Changing “POWER” switch modes
Within 10 seconds of the buzzer sounding, release the brake pedal and press the
“POWER” switch.
The hybrid system does not start and modes will be changed each time the switch is
pressed. (  P. 1 7 8 )