brake TOYOTA TUNDRA 2023 Manual Online

4807-2. Steps to take in an emergency
If you think something is wrong
●Fluid leaks un der the vehicle.
(Water dripping from the air conditioning a fter use is normal.)
● Flat-looking tires or uneven tire wear
● Engine coolant temperature gauge needle continually points high er
than normal.
● Changes in exhaust sound
● Excessive tire squeal when cornering
● Strange noises related to the suspension system
● Pinging or other noises related to the engine
● Engine misses, stumbli ng or running roughly
● Appreciable loss of power
● Vehicle pulls heavily to one side when braking
● Vehicle pulls heavily to one s ide when driving on a level road
● Loss of brake effectiveness, spongy feeling, pedal almost touch es
the floor
If you notice any of the followi ng symptoms, your vehicle proba -
bly needs adjustment or repair. Contact your Toyota dealer as
soon as possible.
Visible symptoms
Audible symptoms
Operational symptoms

4827-2. Steps to take in an emergency
If a warning light turns on or a war ning
buzzer sounds
Calmly perform the following actions if any of the warning ligh ts
comes on or flashes. If a light comes on or flashes, but then
goes off, this does not necessarily indicate a malfunction in the
system. However, if this continues to occur, have the vehicle
inspected by your Toyota dealer.
Warning light and w arning buzzer list
Warning lightWarning light/Details/Actions
(U.S.A.)
(Canada)
Brake system warning light • Low brake fluid
• Malfunction in the brake system
*1
 Immediately stop the vehicle in a safe place and con-
tact your Toyota dealer.
(U.S.A.)
(Canada)
Malfunction indicator lamp Indicates a malfunction in:
• The emission control system;
• The electronic engine control system;
• The electronic throttle control system; or
• The electronic automatic transmission control system.
 Have the vehicle inspected by your Toyota dealer
immediately.
SRS warning light
Indicates a malfunction in:
• The SRS airbag system;
• The front passenger occupant classification system; or
• The seat belt pretensioner system
 Have the vehicle inspected by your Toyota dealer
immediately.
(U.S.A.)
(Canada)
ABS warning light Indicates a malfunction in:
• The ABS; or
• The brake assist system
 Have the vehicle inspected by your Toyota dealer
immediately.

4837-2. Steps to take in an emergency
7
When trouble arises
Slip indicator lightIndicates a malfunction in:
• The VSC system;
• Trailer Sway Control system (if equipped);
• The TRAC system;
• The hill-start assist control system (if equipped);
• The active traction control system (if equipped);
• The AUTO LSD system; or
• The Crawl Control system (if equipped)
 Have the vehicle inspected by your Toyota dealer
immediately.
(Flashes rapidly)
Rear differential lock indicator light*2
Indicates a malfunction in the rear differential lock system
 Have the vehicle inspected by your Toyota dealer
immediately.
(Flashes)
Low speed four-wheel drive indicator light*2
Indicates a malfunction in the four-wheel drive system
 Have the vehicle inspected by your Toyota dealer
immediately.
Low fuel level warning light
Indicates remaining fuel is approximately 3.2 gal. (12.0 L,
2.6 Imp.gal.) or less
 Refuel the vehicle.
Seat belt reminder light (warning buzzer)*3
Warns the driver and/or front passenger to fasten their
seat belts
 Fasten the seat belt.
If the front passenger’s seat is occupied, the front
passenger’s seat belt also needs to be fastened to
make the warning light (warning buzzer) turn off.
(U.S.A.)
(Canada)Parking brake indicator (warning buzzer)*4
Warns the driver to release parking brake.
 Release the parking brake.
Master warning light (warning buzzer)
A buzzer sounds and the warning light comes on and
flashes to indicate that the master warning system has
detected a malfunction.
 P. 489
Warning lightWarning light/Details/Actions

4857-2. Steps to take in an emergency
7
When trouble arises
*3: Driver’s seat belt buzzer:The driver’s seat belt warning buzzer sounds to alert the drive r that his or
her seat belt is not fastened. Once the engine switch is turned to the “ON”
position (vehicles without smart entry & start system) or IGNIT ION ON
mode (vehicles with smart entry & start system), the buzzer sou nds. If the
seat belt is still unfastened, the buzzer sounds intermittently for a certain
period of time after the vehicle reaches a certain speed.
Front passenger’s seat belt buzzer:
The front passenger's seat belt warning buzzer sounds to alert the front
passenger that his or her seat belt is not fastened. If the sea t belt is unfas-
tened, the buzzer sounds intermittently for a certain period of time after the
vehicle reaches a certain speed.
*4: Parking brake engaged warning buzzer:
A buzzer will sound if the vehicle is driven at a speed of approximately
3 mph (5 km/h) or more.
*5: If equipped
■ SRS warning light
This warning light system monitors the airbag sensor assembly, front impact
sensors, side impact sensors (front), side impact sensors (rear ), driver’s seat
position sensor, driver’s seat belt buckle switch, front passen ger occupant
classification system (ECU and sensors), “AIR BAG ON” indicator light, “AIR
BAG OFF” indicator light, front passenger’s seat belt buckle switch, seat belt
pretensioners assemblies, airbags, interconnecting wiring and power
sources. ( P. 38)
■ Front passenger detection sensor, seat belt reminder and warnin g
buzzer
● If luggage is placed on the front passenger seat, the front pas senger detec-
tion sensor may cause the warning light to flash and the warnin g 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.

4877-2. Steps to take in an emergency
7
When trouble arises
WARNING
■If both the ABS and the brake system warning lights remain on
Stop your vehicle in a safe place immediately and contact your Toyota
dealer. The vehicle will become extremely unstable during braki ng, and the
ABS system may fail, which could cause an accident resulting in death or
serious injury.
■ If the tire pressure warning light comes on (if equipped)
Be sure to observe the following precautions. Failure to do so could cause a
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 infla-
tion pressure immediately.
● If the tire pressure warning light comes on even after tire inf lation pressure
adjustment, it is probable that you have a flat tire. Check the tires. If a tire
is flat, change it with the spare tire and have the flat tire repaired by the
nearest Toyota dealer.
● Avoid abrupt maneuvering and braking. If the vehicle tires dete riorate, you
could lose control of the steering wheel or the brakes.
■ If a blowout or sudden air leakage should occur (vehicles with the tire
pressure warning system)
The tire pressure warning system may not activate immediately.
■
Maintenance of the tires (vehicles with the tire pressure warning
system)
Each tire, including the spare (if provided), should be checked monthly
when cold and inflated to the inflation pressure recommended by the
vehicle manufacturer on the vehicle placard or tire inflation p ressure
label (tire and load information label). (If your vehicle has t ires of a dif-
ferent size than the size indicated on the vehicle placard or t ire inflation
pressure label [tire and load information label], you should de termine
the proper tire inflation p ressure for those tires.)
As an added safety feature, your vehicle has been equipped with a tire
pressure monitoring system (TPMS-tire pressure warning system) that
illuminates a low tire pressure telltale (tire pressure warning light)
when one or more of your tires is significantly under-inflated. Accord-
ingly, when the low tire pressure telltale (tire pressure warni ng light)
illuminates, you should stop and check your tires as soon as po ssible,
and inflate them to the proper pressure. Driving on a significa ntly
under-inflated tire causes the tire to overheat and can lead to tire fail-
ure. Under-inflation also reduces fuel efficiency and tire tread life, and
may affect the vehicle’s handling and stopping ability.

489
7
When trouble arises
7-2. Steps to take in an emergency
If a warning message is displayed
Master warning light
The master warning light also
comes on or flashes in order to
indicate that a message is cur-
rently being displayed on the multi-
information display.
Multi-information display
If any of the warning light comes on again after the following actions
have been performed, contact your Toyota dealer.
If a warning is shown on the multi-information display, stay ca lm
and perform the following actions:
1
2
Warning message and warning buzzer list
Warning messageDetails/Actions
Indicates the following: • The brake fluid level is low; or,
• The brake system is malfunctioning
*1.
 Immediately stop the vehicle in a safe place
and contact your Toyota dealer.
(U.S.A.)
(Canada)
(U.S.A.) (Canada)

4917-2. Steps to take in an emergency
7
When trouble arises
Indicates a malfunction in:• The ABS; or
• The brake assist system
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates a malfunction in: • The VSC system;
• Trailer Sway Control system (if equipped);
• The TRAC system;
• The hill-start assist control system (ifequipped);
• The active traction control system (if equipped);
• The AUTO LSD system; or
• The Crawl Control system (if equipped)
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates a malfunction in the tire pressure moni-
toring system.
The tire pressure warning light comes on after
flashing for 1 minute.
 Have the vehicle inspected by your Toyota
dealer.
Warning messageDetails/Actions
(U.S.A.)
(Canada)
(U.S.A.) (Canada)
(Flashes and then
remains on)

4927-2. Steps to take in an emergency
(If equipped)
Indicates a malfunction in the cruise control sys-
tem.Press the “ON-OFF” button once to deactivate
the system, and then press the button again to
reactivate the system.
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates a malfunction in the dynamic radar
cruise control system.
Press the “ON-OFF” button once to deactivate
the system, and then press the button again to
reactivate the system.
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates a malfunction in the Brake Override
System. A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
(2GR-FKS engine only)
Indicates that the engine oil level is low.
A buzzer also sounds.
 Check the level of engine oil, and add if
necessary.
This message may appear if the vehicle is
stopped on a slope.
Move the vehicle to a level surface and
check to see if the message disappears.
Warning messageDetails/Actions

4937-2. Steps to take in an emergency
7
When trouble arises
Indicates that the accelerator and brake pedals
are being depressed simultaneously, and the
Brake Override System is operating. (
P. 170)
 Release the accelerator pedal and depress
the brake pedal.
(If equipped)
Indicates that the tire inflation pressure is low.
 Check the tire inflation pressure, and
adjust to the appropriate level.
(Canada only)
Indicates that the washer fluid level is low.
Add washer fluid.
Indicates that remaining fuel is approximately
3.2 gal. (12.0 L, 2.6 Imp.gal.) or less
 Refuel the vehicle.
Warning messageDetails/Actions
(Flashes)

4967-2. Steps to take in an emergency
Indicates that the parking brake is still engaged.If the vehicle reaches a speed of 3 mph
(5 km/h), flashes and a buzzer
sounds to indicate that the parking brake is
still engaged.
 Release the parking brake.
(If equipped)
Indicates a malfunction in the smart key system.
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates that a Blind Spot Monitor sensor or the
surrounding area on the bumper is dirty or cov-
ered with ice.
A buzzer also sounds.
 Clean the sensor and its surrounding area
on the bumper.
(If equipped)
Indicates a malfunction in the BSM (Blind Spot
Monitor) system. A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Warning messageDetails/Actions
(U.S.A.) (Canada)
(Flashes)