
2634-5. Using the driving support systems
4
Driving
WARNING
■When to disable the pre-collision system
In  the  following  situations,  disable  the  system,  as  it  may  not  operate  prop-
erly, possibly leading to an accident resulting in death or ser ious injury:
● When the vehicle is being towed
● When your vehicle is towing another vehicle
● When  transporting  the  vehicle  via  truck,  boat,  train  or  similar   means  of
transportation
● When  the  vehicle  is  raised  on  a  lift  with  the  engine  running  an d  the  tires
are allowed to rotate freely
● When inspecting the vehicle using a drum tester such as a chass is dyna-
mometer  or  speedometer  tester,  or  when  using  an  on  vehicle  whee l  bal-
ancer
● When a strong impact is applied to the front bumper or front gr ille, due to
an accident or other reasons
● If the vehicle cannot be driven in a stable manner, such as when the vehi-
cle has been in an accident or is malfunctioning
● When the vehicle is driven in a sporty manner or off-road
● When the tires are not properly inflated
● When the tires are very worn
● When tires of a size other than specified are installed
● When tire chains are installed
● When a compact spare tire or an emergency tire puncture repair  kit is used
● If equipment (snow plow, etc.) that may obstruct the radar sens or or front
camera is temporarily installed to the vehicle 

2824-5. Using the driving support systems
WARNING
●Assisting the driver to judge proper following distance
The  dynamic  radar  cruise  control  determines  whether  the  followi ng  dis-
tance between the driver’s own vehicle and a designated vehicle  traveling
ahead  is  within  a  set  range.  It  is  not  capable  of  making  any  other  type  of
judgement.  Therefore,  it  is  absolutely  necessary  for  the  driver   to  remain
vigilant  and to determine whether or not there is a  possibility   of danger  in
any given situation.
● Assisting the driver to operate the vehicle
The dynamic radar cruise control has limited capability to prev ent or avoid
a  collision  with  a  vehicle  traveling  ahead.  Therefore,  if  there   is  ever  any
danger,  the  driver  must  take  immediate  and  direct  control  of  th e  vehicle
and act appropriately in order to ensure the safety of all involved.
■ Situations unsuitable for dynamic radar cruise control
Do not use dynamic radar cruise control in any of the following  situations.
Doing so may result in inappropriate speed control and could ca use an acci-
dent resulting in death or serious injury.
● Roads where there are pedestrians, cyclists, etc.
● In heavy traffic
● On roads with sharp bends
● On winding roads
● On slippery roads, such as those covered with rain, ice or snow
● On steep downhills, or where there are sudden changes between s harp up
and down gradients 
Vehicle speed may exceed the set speed when driving down a stee p hill.
● At entrances to freeways and highways
● When weather conditions are bad enough that they may prevent the sen-
sors from detecting correctly (fog, snow, sandstorm, heavy rain, etc.)
● When there is rain, snow, etc., on the front surface of the rad ar sensor or
front camera
● In traffic conditions that require frequent repeated acceleration and decel-
eration
● When your vehicle is towing a trailer or during emergency towin g
● When an approach warning buzzer is heard often 

2974-5. Using the driving support systems
4
Driving
WARNING
■To avoid operating the cruise control by mistake
Switch the cruise control off using the “ON-OFF” button when not in use.
■ Situations unsuitable for cruise control
Do not use cruise control in any of the following situations.
Doing so may result in loss of control and could cause an accid ent resulting
in death or serious injury.
● In heavy traffic
● On roads with sharp bends
● On winding roads
● On slippery roads, such as those covered with rain, ice or snow
● On steep hills
Vehicle speed may exceed the set speed when driving down a stee p hill.
● When your vehicle is towing a trailer or during emergency towin g 

3114-5. Using the driving support systems
4
Driving
■Conditions  under  which  the  Blind  Spot  Monitor  function  may  not  func-
tion correctly
● The Blind Spot Monitor function may not detect vehicles correct ly in the fol-
lowing conditions:
• During bad weather such as heavy rain, fog, snow, etc.
• When ice or mud, etc., is attached to the rear bumper
• When  driving  on  a  road  surface  that  is  wet  due  to  rain,  standi ng  water,
etc.
• When there is a significant difference in speed between your v ehicle and
the vehicle that enters the detection area
• When  a  vehicle  is  in  the  detection  area  from  a  stop  and  remains  in  the detection area as your vehicle accelerates
• When driving  up or  down consecutive  steep inclines, such as  hills,  a dip
in the road, etc.
• When  multiple  vehicles  approach  with  only  a  small  gap  between  each vehicle
• When  vehicle  lanes  are  wide,  and  the  vehicle  in  the  next  lane  is  too  far
away from your vehicle
• When  the  vehicle  that  enters  the  detection  area  is  traveling  a t  about  the
same speed as your vehicle
• When towing anything such as trailer, boat, etc.
• When there is a significant difference in height between your  vehicle and
the vehicle that enters the detection area
• Directly after the BSM function is set to on
• When towing a trailer
• When items such as a bicycle carrier are installed on the rear  of the vehi-
cle
● Instances of the Blind Spot Monitor function unnecessarily dete cting a vehi-
cle and/or object may increase under the following conditions:
• When there is only a short distance between your vehicle and a  guardrail,
wall, etc.
• When there is only a short distance between your vehicle and a  following
vehicle
• When vehicle lanes are narrow and a vehicle driving 2 lanes ac ross from
your vehicle enters the detection area
• When items such as a bicycle carrier are installed on the rear  of the vehi-
cle 

3144-5. Using the driving support systems
■Conditions  under  which  the  Rear  C ross  Traffic  Alert  function  will  not
detect a vehicle
The  Rear  Cross  Traffic Alert  function  is  not  designed  to  detect   the  following
types of vehicles and/or objects.
● Small motorcycles, bicycles, pedestrians, etc.
*
●Vehicles approaching from directly behind
● Guardrails, walls, signs, parked vehicles and similar stationar y objects
*
●Vehicles moving away from your vehicle
● Vehicles approaching from the parking spaces next to your vehic le
*
●Vehicles backing up in the parking space next to your vehicle*
*
: Depending on conditions, detection of a vehicle and/or object  may occur.
■ Conditions under which the Rear C ross  Traffic  Alert  function  may  not
function correctly
The Rear Cross Traffic Alert function may not detect vehicles c orrectly in the
following conditions.
● When ice or mud, etc., is attached to the rear bumper
● During bad weather such as heavy rain, fog, snow, etc.
● When multiple vehicles approach continuously
● Shallow angle parking
● When a vehicle is approaching at high speed
● When parking on a steep incline, such as hills, a dip in the ro ad, etc.
● Directly after the RCTA function is set to on
● Directly after the engine is started with the RCTA function is  on
● When towing a trailer
● Vehicles  that  the  sensors  cannot  detect
because of obstacles 

3284-5. Using the driving support systems
Trailer brake type
Trailer  brake  type  can  be  selected  by  using  the  multi-informati on.  The
combination  meter  will  show  which  trailer  brake  type  is  selected  in  the
multi-information display.
Manual TRAILER BRAKE OUTPUT slider
Adjusting  this  slider  position  will  engage  the  trailer’s  brakes   only.  If  the
manual  TRAILER  BRAKE  OUTPUT  slider  is  used  while  the  vehicle
brake is applied, the greater of the two outputs will be sent to the trailer
brakes.
The trailer brake type can be se lected on the multi-information display
as following:
Press “ ” or “” of meter control sw itches and select  .
Press  “ ”  or  “ ”  of  meter  control  switches  and  select  “Vehicle  Set-
tings”, and press  .
Press  “ ”  or  “ ”  of  meter  control  switches  and select “TBC Trailer
Type”, and press   to select the correct type of trailer brakes  that
are equipped on the trailer.
Changing trailer brake type will  cause the current gain setting to reset
to  zero.  Make  sure  to  set  the  gain  as  described  in  the  followin g  sec-
tion.
Gain setting on trailer brake controller should be set for a sp ecific tow-
ing  condition.  Gain  setting  should  be  adjusted  each  time  the  ve hicle
load,  trailer  load,  road  conditions,  or  weather  changes.  Settin g  the
gain value to 0 will disable the tra iler brake controller output.
Make  sure  the  trailer  brakes  are  in  good  working  condition  and
functioning normally. See trailer dealer if necessary.
Hook up the trailer and make p roper electrical connections.
Select  the  correct  type  of  trailer  brakes  that  are  equipped  on  the
trailer by using the multi-information display.
Drive vehicle with trailer attached on a level road surface sim ilar to
towing  condition  and  in  traffic-free  environment.  Driving  speed
should be approximately 20 -  25 mph [35 - 40 km/h].
Changing settings of the trailer brake type
Setting the Gain
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![TOYOTA TUNDRA 2021  Owners Manual (in English) 3294-5. Using the driving support systems
4
Driving
Using  the  GAIN  (+/-)  selection
buttons,  set  a  starting  gain  of
5.0.
While  driving  20  -  25  mph  [35  -  40  km/h],  fully  apply  the 
 TOYOTA TUNDRA 2021  Owners Manual (in English) 3294-5. Using the driving support systems
4
Driving
Using  the  GAIN  (+/-)  selection
buttons,  set  a  starting  gain  of
5.0.
While  driving  20  -  25  mph  [35  -  40  km/h],  fully  apply  the](/manual-img/14/43052/w960_43052-328.png)
3294-5. Using the driving support systems
4
Driving
Using  the  GAIN  (+/-)  selection
buttons,  set  a  starting  gain  of
5.0.
While  driving  20  -  25  mph  [35  -  40  km/h],  fully  apply  the 
manual
TRAILER BRAKE OUTPUT
 slider.
Adjust  the  gain  setting,  using  t he  GAIN  (+/-)  selection  buttons ,  to
either  increase  or  decrease  to  j ust  below  the  point  of  trailer wheel
lock-up.
For confirmation, repeat steps   and   until desired gain setting
is reached (just below point of trailer wheel lock-up).
■ When using the trailer brake control system
Please  turn  off  the  intuitive  parking  assist  while  towing  a  tra iler.  If  left  on,
sonar sensors will detect the trailer being towed.
■ When setting the gain
Wheel  lock-up  occurs  when  the  trailer  wheel  squeals  or  tire  smo ke  occurs.
Trailer wheels may not lock-up while driving heavily loaded trailer. During this
case,  adjust  the  Trailer  gain  to  the  highest  allowable  setting  for  the  towing
condition.
■ When disconnecting and reco nnecting battery terminals
The gain setting data will be reset.
5
6
7
867 

3725-3. Using the storage features
Front door
Rear door (CrewMax models)
Bottle holders
WARNING
■Items unsuitable for the bottle holders
Do not place anything other than a bottle in the bottle holders .
Other items may be thrown out of the holders in the event of an  accident or
sudden braking and cause injury.
NOTICE
■ Items that should not be st owed in the bottle holders
Put the cap on before stowing a bottle. Do not place open bottles in the bot-
tle  holders, or glasses and paper cups  containing liquid. The  c ontents may
spill and glasses may break.