2021 TOYOTA TUNDRA Owners Manual (in English)

4977-2. Steps to take in an emergency
7
When trouble arises
(If equipped)
Indicates a malfunction in the PCS (Pre-Collision
System).A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates a malfunction in the LDA (Lane Depar-
ture Alert).
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates that the LDA (Lane Departure Alert)
system cannot be used as the vehicle speed is
lower than approximately 32 mph (50 km/h).
Drive the vehicle at approximately 32 mph
(50 km/h) or more.
(If equipped)
Indicates that LDA (Lane Departure Alert) system
cannot be used due to the vehicle speed being
too high.
Slow down.
Indicates a malfunction in the SRS airbag sys-
tem.
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates the following:
• The brake fluid level is low; or
• The brake system is malfunctioning.
A buzzer also sounds.
 Immediately stop the vehicle in a safe place
and contact your Toyota dealer.
Warning messageDetails/Actions
Pre-Collision System
Malfunction
Visit Your Dealer
LDA
Malfunction
Visit Your Dealer
(Yellow)
LDA
Unavailable
Below Approx. 32MPH
LDA
Unavailable
at Current Speed
SRS Airbag System
Malfunction
Visit Your Dealer
Check Brake System

4987-2. Steps to take in an emergency
(If equipped)
Indicates that radar cruise control sensor is dirty
or covered with ice.A buzzer also sounds.
 Clean the sensor.
(If equipped)
Indicates that the dynamic radar cruise control
system cannot be used temporarily due to bad
weather
A buzzer also sounds.
 Use the dynamic radar cruise control sys-
tem when it becomes available again.
(If equipped)
Indicates that the RCTA (Rear Cross Traffic Alert)
sensors or the surrounding area on the bumper is
dirty or covered with ice (if equipped)
A buzzer also sounds.
 Clean the sensor and its surrounding area
on the bumper.
(If equipped)
The operation conditions of the front camera
(temperature, etc.) are not met.
 When the operation conditions of the front
camera (temperature, etc.) are met, the fol-
lowing systems will become available.
(P. 258, 485)
• PCS (Pre-Collision System)
• LDA (Lane Departure Alert) system
• Dynamic radar cruise control
• Automatic High Beam
(If equipped)
Indicates that dirt, rain, condensation, ice, snow,
etc., are present on the windshield in front of the
front camera. The following systems may be sus-
pended until the problem shown in the message
is resolved. ( P. 258, 485)
• PCS (Pre-Collision System)
• LDA (Lane Departure Alert) system
• Dynamic radar cruise control
• Automatic High Beam
 Tum the system off, remove any dirt, rain,
condensation, ice, snow, etc., from the
windshield, and then turn the system back
on.
Warning messageDetails/Actions
Radar Cruise
Control
Unavailable
Clean Sensor
Radar Cruise Control
Unavailable
Rear Cross Traffic Alert Unavailable
Front Camera Unavailable
(Yellow)
Front Camera
Unavailable
See Owner’s Manual
(Yellow)

4997-2. Steps to take in an emergency
7
When trouble arises
Indicates a malfunction in the Drive-start control.A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates that the shift position was changed and
Drive-Start Control was operated while depress-
ing the accelerator pedal.
Momentarily release the accelerator pedal.
(Flashes)
Indicates that the headlight switch is left on (with
the key removed and the driver’s door opened)
A buzzer also sounds.
 Turn the lights off.
Indicates a malfunction in:
• The automatic headlight leveling system; or
• The LED headlight system (if equipped).
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
(If equipped)
Indicates a malfunction in the Automatic High
Beam system.
Have the vehicle inspected by your Toyota
dealer.
Indicates that the tire inflation pressure is low.
Check the tire inflation pressure, and
adjust to the appropriate level.
(If equipped)
Indicates that the Automatic High Beam switch is
pressed while the headlights are in low beam.
Turn the high beam on and press the Auto-
matic High Beam switch again.
Warning messageDetails/Actions
Drive-Start
Control
Malfunction
Visit Your Dealer
Release
Accelerator
Turn Lights Off
Headlight System Malfunction
Visit Your Dealer
Headlight System Malfunction
Visit Your Dealer
Tire Pressure Low Check Tire
Auto High Beam Ready Turn ON High Beam to
Activate

5007-2. Steps to take in an emergency
(If equipped)
Indicates that, since the VSC (Vehicle Stability
Control) system was turned off, the pre-collision
brake system operation is stopped.
Turn the VSC on. ( P. 323)
(If equipped)
Indicates that the pre-collision system is tempo-
rarily unavailable.
Please wait until the system returns. If the
message does not disappear, the system
may be malfunctioning. Have the vehicle
inspected by your Toyota dealer immedi-
ately.
(If equipped)
Indicates that the pre-collision system sensor is
dirty, covered with ice, etc.
Remove any dirt, ice, etc.
Indicates a malfunction in the RCTA (Rear Cross
Traffic Alert).
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates that the VSC ECU or G sensor is not
communicating with trailer brake control system.
Indicates a malfunction in the VSC system.
Have the vehicle inspected by your Toyota
dealer immediately.
Warning messageDetails/Actions
VSC Turned Off
Pre-Collision Brake
System
Unavailable
Pre-Collision System Unavailable
Pre-Collision System Unavailable
Clean Sensor
Rear Cross Traffic Alert Malfunction
Visit Your Dealer
Trailer Brake Error. If Towing,
Come to a Safe Stop
with Manual Controls.
Contact dealer.

5017-2. Steps to take in an emergency
7
When trouble arises
*: Refer to the separate “Scheduled Maintenance Guide” or “Owner’s Manual
Supplement” for the maintenance interval applicable to your veh icle.
■Warning message in radar cruise mode (if equipped)
In the following cases, the warning message may not be displaye d even if
vehicle-to-vehicle distance decreases:
● When your vehicle and the vehicle ahead are traveling at the sa me 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
■
Conditions that the tire pressure warning system may not functi on
properly
 P. 4 3 2
Indicates that an internal switch failure of trailer
brake control system, an over current detected by
trailer brake control system.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates that an internal microprocessor error,
output circuit to trailer brakes unintended current,
or manual brake output slider is stuck or broken
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates that the output circuit has reverse volt-
age, or the internal trailer brake control system
temperature is too high.
Check trailer wiring issue, check trailer
connection. If there is still a problem, have
the vehicle inspected by your Toyota dealer
immediately.
Warning messageDetails/Actions
Trailer Brake Error.
If Towing,
Come to a Safe Stop
Contact dealer.
Trailer Wiring,
Type, or Connection
fault.
See Owner’s manual.

5027-2. Steps to take in an emergency
After taking the specified steps to correct the suspected problem,
check that the warning m essage and light go off.
Have the malfunction repaired immediately. (vehicles with a
smart key system)
Interior
buzzerExterior buzzerWarning messageDetails/Actions
Contin-
uous  The driver’s door was opened
when the shift lever was not in
P and the engine switch was
not turned off.

Shift the shift lever to P.
Contin-
uousContin-
uous
The driver’s door was opened
and closed while the elec-
tronic key was not in the vehi-
cle, the shift lever was not in P
and the engine switch was not
turned off.
Shift the shift lever to P.
 Bring the electronic key
back into the vehicle.
Once3 times
The driver’s door was opened
and closed while the elec-
tronic key was not in the vehi-
cle, the shift lever was in P
and the engine switch was not
turned off.
Turn the engine switch
off.
 Bring the electronic key
back into the vehicle.
The electronic key was carried
outside the vehicle and a door
other than the driver’s door
was opened and closed while
the engine switch was in a
mode other than off.
Bring the electronic key
back into the vehicle.
Shift into P Position
(Flashes)
Shift into P Position
Key Not Detected
(Flashes)
Key Not Detected
(Flashes)

5037-2. Steps to take in an emergency
7
When trouble arises
OnceContin-
uous
An attempt was made to exit
the vehicle with the electronic
key and lock the doors without
first turning the engine switch
off when the shift lever was in
P.
Turn the engine switch
off and lock the doors
again.
Once
The electronic key is not
detected when an attempt is
made to start the engine.
Start the engine with the
electronic key present.
9 times
An attempt was made to drive
when the electronic key was
not inside the vehicle.
Confirm that the elec-
tronic key is inside the
vehicle.
Contin-
uous
An attempt was made to lock
the doors using the smart key
system while the electronic
key was still inside the vehicle.
Retrieve the electronic
key from the vehicle and
lock the doors again.
OnceContin-
uous
An attempt was made to lock
either front door by opening a
door and putting the inside
lock button into the lock posi-
tion, then closing the door with
the electronic key still inside
the vehicle.
Retrieve the electronic
key from the vehicle and
lock the doors again.
Once
The electronic key has a low
battery.
Replace the electronic
key battery. ( P. 451)
Interior
buzzerExterior buzzerWarning messageDetails/Actions
Turn Power OFF
Key Not Detected
(Flashes)
Key Not Detected
(Flashes)
Key Not Detected
(Flashes)
Key Detected in Vehicle
(Flashes)
Key Detectedin Vehicle
(Flashes)
Key Battery Low

5047-2. Steps to take in an emergency
Once
The steering lock could not be
released within 3 seconds of
the engine switch being
pressed.
Press the engine switch
while depressing the
brake pedal and moving
the steering wheel left
and right.
Once
• When the doors were
unlocked with the mechani-
cal key and then the engine
switch was pressed, the
electronic key could not be
detected in the vehicle.
• The electronic key could not be detected in the vehicle
even after the engine switch
was pressed two consecu-
tive times.
 Touch the electronic key
to the engine switch
while depressing the
brake pedal.
Once
Indicates that:
• With the engine switch off,
the doors were unlocked
and then the driver’s door
was opened and closed
• The engine switch was turned to ACC without start-
ing the engine
 Press the engine switch
while depressing the
brake pedal.
Once
The engine switch has been
turned off with the shift lever in
a position other than P.
Shift the shift lever to P.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
Steering Lock ON
(Flashes)
Engine Start:
Press Brake Pedal,
Touch Engine Switch
with Key
Engine Start:
Press Brake Pedal and
Push Engine Switch
Shift into P Position
(Flashes)