2012 Lexus IS F brake

5
When trouble arises
463
5-2. Steps to take in an emergency
If a warning light turns on or a warning buzzer sounds...
Stop the vehicle immediately. Continuing to drive the vehicle may be dangerous.
The following warning indicates a possible problem in the brake system.
Immediately stop the vehi cle in a safe place and contact your Lexus
dealer.
*: Parking brake engaged warning buzzer:
 P. 4 7 7
Warning lightWarning light/Details
(U.S.A.)

(Canada)
Brake system warning light (warning buzzer)*
•Low brake fluid
• Malfunction in the brake booster system
This light also comes on when the parking brake is not
released. If the light turns off after the parking brake is fully
released the system is operating normally.
Calmly perform the following actions if any of the warning lights turn on or
flash. If a light turns on or flashes, bu t then turns off, this does not necessar-
ily indicate a malfunction in the system.

5
When trouble arises
465
5-2. Steps to take in an emergency
Warning lightWarning light/Details
(U.S.A.)

(Canada)
ABS warning lightIndicates a malfunction in:
•The ABS; or
• The brake assist system.
Electric power steering system warning lightIndicates a malfunction in the EPS (Electric Power Steering)
system.
Pre-collision system warning light (if equipped)Indicates a malfunction in the pre-collision system.
The warning light will operate as follows, even when the sys-
tem is not malfunctioning:
• The light will flash quickly wh en the system is operating.
( P. 2 0 3 )
• The light will flash when the pre-collision braking is dis- abled. ( P. 2 0 4 )
• The light will flash when the system cannot temporarily be used. ( P. 4 7 7 )
Slip indicator
Indicates a malfunction in:
• The VSC system;
•The TRAC system; or
• The hill-start assist control system
■Electric power steering system warning light
When the voltage is low or drops, the electric power steering system warning light
may come on.

470
5-2. Steps to take in an emergency
CAUTION
■If the tire pressure warning light comes on
Be sure to observe the following precautions. Failure to do so could cause loss of
vehicle control and result in death or serious injury.
●Stop your vehicle in a safe place as soon as possible. Adjust the tire inflation pres-
sure immediately.
●If the tire pressure warning light comes on even after tire inflation pressure adjust-
ment, it is probable that you have a flat tire. Check the tires. If the tire is flat,
change to the spare tire and have the flat tire repaired by the nearest Lexus
dealer.
●Avoid abrupt maneuvering and braking. If the vehicle tires deteriorate, you could
lose control of the steering wheel or the brakes.
■If a blowout or sudden air leakage should occur
The tire pressure warning system may not activate immediately.

478
5-2. Steps to take in an emergency
Indicates that the trunk is
not fully closed. flashes and a
buzzer sounds to indi-
cate that trunk is not fully
closed (with the vehicle
having reached a speed
of 3 mph [5 km/h]).
Close the trunk.
(Flashing)
(If equipped)
Indicates that the moon
roof is not fully closed
(with the “ENGINE
START STOP” switch
OFF and the driver’s
door opened).
Close the moon roof.
Indicates that the parking
brake is still engaged.
flashes and a
buzzer sounds to indi-
cate that the parking
brake is still engaged
(with the vehicle having
reached a speed of 3
mph [5 km/h]).
Release the parking
brake.
(Flashing)
Indicates that the auto-
matic transmission fluid
temperature is too high
 P. 1 4 6
Wa r n i n g m e s s a g eDetailsCorrection procedure

5
When trouble arises
481
5-2. Steps to take in an emergency
(Flashing and then con-tinuously on)
(Flashing)
(If equipped)Indicates that the radar
cruise control sensor is
dirty or covered with ice.
Clean the sensor.
(Flashing and then con- tinuously on)
(Flashing)
(If equipped)Indicates that the radar
cruise control system is
unable to judge vehicle-
to-vehicle distance.
• Switch the driving mode to either the normal or
“Sport” mode.
• If the windshield wipers are on, turn them off or
set them to either the
intermittent or the slow
mode.
(Flashing)
(If equipped)
Indicates that your vehi-
cle is nearing the vehicle
ahead (in radar cruise
mode).
Slow the vehicle by apply-
ing the brakes.
Wa r n i n g m e s s a g eDetailsCorrection procedure

482
5-2. Steps to take in an emergency
*: Refer to the separate “Scheduled Maintenance” or “Owner’s Manual Supple-ment” for the maintenance interval applicable to your vehicle.
(Flashing)
(If equipped)
Indicates that there is a
high possibility of a fron-
tal collision, or that the
pre-collision braking
function is operating.
Slow the vehicle by apply-
ing the brakes.
■Warning light display in dynamic radar cruise mode (if equipped)
In the following cases, the warning light may not be displayed even if vehicle-to-
vehicle distance decreases.
●When your vehicle and the vehicle ahead are traveling at the same speed or the
vehicle ahead is traveling more quickly than your vehicle
●When the vehicle ahead is traveling at a very low speed
●Immediately after cruise control speed is set
●At the instant the accelerator pedal is depressed
Wa r n i n g m e s s a g eDetailsCorrection procedure

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When trouble arises
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5-2. Steps to take in an emergency
Once(Comes on for 10 sec-onds.)
(Flashing)
Indicates that the
key battery is low.Replace the bat-
tery. ( P. 4 2 9 )

Indicates that the
“ENGINE START
STOP” switch has
been turned
twice to ACCES-
SORY mode
without starting
the engine when
a closed door is
opened.
Press the
“ENGINE START
STOP” switch
while applying the
brakes.

(Flashing)
Indicates that the
steering lock has
not released
within 3 seconds
of pressing the
“ENGINE START
STOP” switch.Press the
“ENGINE START
STOP” switch
again while turn-
ing the steering
wheel with the
brake pedal
depressed.
Interior
buzzerExterior buzzerWa r n i n g m e s s a g eDetailsCorrection
procedure

5
When trouble arises
487
5-2. Steps to take in an emergency
If you have a flat tire
Remove the flat tire and replace it with the spare tire provided. The spare
tire can only be used on the front wheels.
■ 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 engine.
● Turn on the emergency flashers.
■ Location of the spare tire, jack and tools
Tool bag
(including towing eyelet) Jack
Spare tireJack handle
Tighten Loosen