2023 TOYOTA TUNDRA HYBRID lock

3634-5. Using the driving support systems
Owners Manual_USA_M0C052_en
4
Driving
*: If equipped
Press the switch to turn the sys-
tem on/off.
At this time, the rear differential lock
indicator and indicator in the differ-
ential lock/unlock display will blink.
Wait a few seconds for the system
to complete operation. After the
rear different ial is locked, the indi-
cators will stop blinking and remain
on.
To unlock the rear differential, push
the switch again.
■Operating tips
●Be sure to stop the wheels before
locking the differential.
●Unlock the differential as soon as the vehicle moves out.
■Unlocking the rear differential
If the rear different ial lock indicator
still flashes even a fter unlocking the
rear differential, check the safety of
the surrounding area and slightly
turn the steering wheel in either
direction while the vehicle is in
motion.
■Automatic unlocking feature
The rear different ial lock is also
unlocked in any of the following situ-
ations:
●When the front-wheel drive control
switch is turned to “2H” or “4H”
●When the power switch is turned
off
■After unlocking the rear differ-
ential
Check that the indicators go off.
■The rear different ial lock indica-
tor and indicator in the differen-
tial lock/unlock display
●The indicators blink while lock-
ing/unlocking the rear differential.
●If the indicators c ontinue to blink
when you operate the rear differ-
ential lock switch, stop the vehicle
completely and operate the switch
again.
If the indicators continue to blink
even if doing so, have the vehicle
inspected by your Toyota dealer as
soon as possible. There may be a
trouble in the four-wheel drive sys-
tem.
■Locking the rear differential
The following systems do not oper-
ate when the rear differential is
locked.
• ABS
• Brake assist system
• VSC
• Downhill assist control system (if equipped)
•TRAC
Rear differential lock
system*
Use the rear differential lock
system only when wheel
spinning occurs in a ditch
or on a slippery or ragged
surface. This system is
effective in case one of the
rear wheels is spinning.
Rear differential lock
switch

3644-5. Using the driving support systems
Owners Manual_USA_M0C052_en
*: If equipped
WARNING
■When using the rear differen-
tial lock system
Failure to obser ve the following
precautions may result in an acci-
dent.
●Do not lock the rear differential
in the conditions other than
above.
●Do not lock the rear differential
until the wheels have stopped
spinning.
●Do not drive over 5 mph (8
km/h) when the d ifferential is
locked.
●Do not keep driving with the
rear differential lock state
Crawl Control*
Allows travel on extremely
rough off-road surfaces at a
fixed low speed without
pressing the accelerator or
brake pedal. Minimizes loss
of traction or vehicle slip
when driving on slippery
road surfaces, allowing for
stable driving.
WARNING
■When using Crawl Control
function
Do not rely solely on the Crawl
Control function. This function
does not extend the vehicle’s per-
formance limitatio ns. Always thor-
oughly check the road conditions,
and drive safely.
■These conditions may cause
the system not to operate
properly
When driving on the following sur-
faces, the system may not be able
to maintain a fixed low speed,
which may result in an accident:
●Extremely steep inclines.
●Extremely uneven surfaces.
●Snow-covered roads, or other
slippery surfaces.

3664-5. Using the driving support systems
Owners Manual_USA_M0C052_en
3“MID”
Suitable for driving on bumpy
inclines
4“HIGH 1”
Suitable for driving on bumpy
inclines, debris roads, snow-cov-
ered roads, muddy roads, gravel
roads and grass roads
5“HIGH 2”
Suitable for driving on bumpy
inclines, debris roads, snow-cov-
ered roads, muddy roads, gravel
roads and grass roads
When the “DAC/CRAWL”
switch indicator illuminates
Press the “DAC/CRAWL” switch
again.
When the “DAC/CRAWL”
switch indicator does not illu-
minate
Press the “DAC/CRAWL” switch
to turn the indicator on. Press
the “DAC/CRAWL” switch again
with the indicator turned on.
If Crawl Control is turned off, the
Crawl Control indicator and the
slip indicator will go off and a
message, stating that Crawl
Control has been turned off will
be displayed on the multi-infor-
mation display for several sec-
onds.
When turning off Crawl Control
while driving, drive extremely
carefully.
■Operating tips
Crawl Control can be used with
Multi-terrain Select (if equipped) ON
or OFF. ( P.369)
■Operation conditions of the
Crawl Control
●The hybrid system is operating.
●The shift lever is in any gear other
than P or N.
●The front-wheel drive control
switch is in “4L”.
●The driver’s door is closed.
■Automatic system cancelation
of Crawl Control
In the following si tuations, the
buzzer will sound in termittently and
the Crawl Contro l will be canceled
automatically. In this event, the
Crawl Control indica tor will flash and
then go off, and a message stating
that Crawl Control has been turned
off will be displayed on the multi-
information displa y for several sec-
onds.
●When the shift lever is moved to P
or N.
●When the front-wheel drive control
switch is in “4H”.
●When the driver’s door is opened.
■Function limitations of Crawl
Control
●On vehicles with rear differential
lock system, in the following situa-
tions, brake control can be used to
drive downhill at a constant
speed. However, hybrid system
control is not ava ilable when driv-
ing uphill at a c onstant speed.
• When the vehicle speed exceeds approximately 6 mph (10 km/h).
●In the following s ituation, hybrid
system control and brake control
will stop temporarily. In this event,
the Crawl Contro l indicator will
flash.
• With the rear differential is locked:
when the vehicle speed exceeds
Turning Crawl Control off

3674-5. Using the driving support systems
Owners Manual_USA_M0C052_en
4
Driving
approximately 6 mph (10 km/h).
• With the rear d ifferential is
unlocked: when the vehicle speed
exceeds approximately 15 mph
(25 km/h).
■When the Crawl Control sys-
tem is operated continuously
●If Crawl Control is used continu-
ously for a long time, the brake
system overheats . In this case, a
buzzer will sou nd, a message
stating a malfunction will be dis-
played on the multi-information
display, and the Crawl Control
indicator will flash and then go off.
In this event, as Crawl Control will
be temporarily inoperable, stop
the vehicle immediately in a safe
place, and allow the brake system
to cool down suffi ciently until the
message goes off. (In the mean-
time, normal driving is possible.)
●If Crawl Control is used continu-
ously for a long time, the auto-
matic transmission overheats. In
this case, a buzzer will sound, the
system will be temporarily can-
celed, and a message stating a
malfunction may be displayed on
the multi-informat ion display. In
this event, stop th e vehicle in a
safe place until the message goes
off.
■Sounds and vibrations caused
by the Crawl Control system
●A sound may be heard from the
hybrid system compartment when
the hybrid system is started or just
after the vehicle begins to move.
This sound does not indicate that
a malfunction has occurred in
Crawl Control system.
●Either of the following conditions
may occur when the Crawl Control
system is operating. None of
these are indicators that a mal-
function has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after
the vehicle comes to a stop.
■When there is a malfunction in
the system
Warning lights and/or warning mes-
sages will tu rn on. (P.501, 511)

3704-5. Using the driving support systems
Owners Manual_USA_M0C052_en
■Multi-terrain Select
Multi-terrain Sel ect controls the
vehicle so that i t can maximize the
drive force and imp rove drivability
on rough roads. As a result, fuel effi-
ciency may diminish when com-
pared to driving in normal mode.
■Automatic system cancelation
In the following situations, Multi-ter-
rain Select will be canceled auto-
matically.
●When the power switch is turned
off
●When the front-wheel drive control
switch is in “2H”
●When “TOW HAUL” mode and
“TOW+” mode is selected while
the front-wheel drive control
switch is in “4H”
●When drive mode select is
selected while the front-wheel
drive control switch is in “4H”
■Turning off Mult i-terrain Select
Performing the following turns Multi-
terrain Select off, and then the dis-
play on the multi-information display
will disappear.
When the “MTS” switch indicator
is illuminated
Press the “MTS” switch while the
system is in operation.
When the “MTS” switch indicator
is not illuminated
Press the “MTS” switch to turn the
indicator on.
Press the “MTS” switch again with
the Multi-terr ain Select indicator illu-
minated.
■When the vehic le is stuck
Switching the transfer and differen-
tial For the operation of the following
functions, refer to the following
pages. (If equipped)
●Four-wheel drive system
(  P.361)
●Rear differential lock ( P.364)
■Driving in Multi-terrain Select
The following types of situations
may occur, but they are not malfunc-
tions.
●Vibrations may be felt throughout
the vehicle or steering wheel.
●Operating noise may be heard
from the hybrid system compart-
ment.
■When an inspection at your
Toyota dealer is necessary
In the following situ ations, the sys-
tem may be malf unctioning. Have
the vehicle inspected by your Toyota
dealer immediately.
●When the slip indica tor light illumi-
nates.
●When the indicator for each mode
does not illuminate on the multi-
information display even though
Multi-terrain Select is selected.

3734-5. Using the driving support systems
Owners Manual_USA_M0C052_en
4
Driving
system indicator switches to steadily
illuminated after a short while and
the system will become available.
■Sounds and vibrations caused
by the downhill assist control
system
●A sound may be heard from the
hybrid system compartment when
the hybrid system is started or just
after the vehicle begins to move.
This sound does not indicate that
a malfunction has occurred in
downhill assist control system.
●Either of the following conditions
may occur when the downhill
assist control system is operating.
None of these are indicators that a
malfunction has occurred.
• Vibrations may be felt through the vehicle body and steering.
• A motor sound may be heard after the vehicle comes to a stop.
■System malfunction
In the following ca ses, have your
vehicle checked by your Toyota
dealer.
●The downhill assist control system
indicator does not come on when
the “DAC/CRAWL” switch is
pressed.
●The slip indicator light comes on.
■ECB (Electronically Con-
trolled Brake System)
The electronically controlled
system generates braking force
corresponding to the brake
operation
■ABS (Anti-lock Brake Sys-
tem)
Helps to prevent wheel lock
when the brakes are applied
suddenly, or if the brakes are
applied while driving on a slip-
pery road surface, or in off-road
conditions (such as rough
roads, sand and mud)
The ABS operates in synchroni-
zation with the Multi-terrain
Select
■Brake assist
Generates an increased level of
braking force after the brake
pedal is depressed when the
WARNING
■The system may not operate
on the following surfaces,
which may lead to an acci-
dent causing death or serious
injury
●Slippery surfaces such as wet
or muddy roads
●Icy surface
●Very bumpy and rough roads
Driving assist systems
To keep driving safety and
performance, the following
systems operate automati-
cally in response to various
driving situations. Be
aware, however, that these
systems are supplementary
and should not be relied
upon too heavily when oper-
ating the vehicle.
Summary of the driving
assist systems

3794-5. Using the driving support systems
Owners Manual_USA_M0C052_en
4
Driving
*: If equipped
“GAIN” (+/-) selection button
Pressing the “GAIN” (+/-) buttons
will adjust the amount of power that
can be outputted to the trailer
brakes. The “gain” can be adjusted
from 0 (no trailer braking) to 10
(maximum output) in 0.5 incre-
ments. Each press of the button will
increase or decrease the “gain” set-
ting by one step. T he “gain” value
will appear in the mu lti-information
display.
Trailer brake type
Trailer brake type can be selected
by using the multi-information. The
combination meter will show which
trailer brake type is selected in the
multi-information display.
Manual brake slider
Adjusting this slider position will
engage the trailer’s brakes only. If
the manual brake slider is used
while the vehicle brake is applied,
the greater of the two outputs will
be sent to the trailer brakes.
Trailer brake control-
ler*
The trailer brakes can be
controlled by the Trailer
brake controller via the 7-
pin connector. By selecting
the type of brakes that are
being used on the trailer
(electric or electric-over-
hydraulic) and setting the
“gain” for the controller, the
manual brake slider is used
to slow just the trailer. The
vehicle brake pedal will also
slow down as well as stop
the trailer when applied,
also via the same connec-
tor. “Gain” values, manual
brake outputs, trailer brake
types, and the trailer con-
nection status are displayed
in the multi-information dis-
play.
WARNING
■When driving on slippery
road surfaces
When stopping with ABS acti-
vated, output to the trailer might
be reduced in order to reduce the
likelihood of trailer wheels to lock.
The trailer is not equipped with
ABS. Drive safely on slippery road
surfaces.
System operation

3804-5. Using the driving support systems
Owners Manual_USA_M0C052_en
Select the item desired to be
setup and select as follows on
the multi-information screen
(P.100):
1 Press or on the meter
control switch and then select
.
2 Press or on the meter
control switch, select “Trailer
Settings”, and then press and
hold on the meter control
switch.
3 According to the display,
select the desired setting and
then press .
Changing trailer brake type or
trailer ID will cause the current
“gain” setting to reset to zero.
Make sure to set the “gain” as
described in the following sec-
tion.
“Gain” setting on trailer brake
controller should be set for a
specific towing condition. “Gain”
setting should be adjusted each
time the vehicle load, trailer
load, road conditions, or
weather changes. Setting the
“gain” value to 0 will disable the
trailer brake controller output. 1
Make sure the trailer brakes
are in good working condition
and functioning normally. See
trailer dealer if necessary.
2 Hook up the trailer and make
proper electrical connections.
3 Select the correct type of
trailer brakes that are
equipped on the trailer by
using the multi-information
display.
4 Drive vehicle with trailer
attached on a level road sur-
face similar to towing condi-
tion and in traffic-free
environment. Driving speed
should be approximately 20 -
25 mph [35 - 40 km/h].
5 Using the “GAIN” (+/-) selec-
tion buttons, set a starting
“gain” of 5.0.
6 While driving 20 - 25 mph [35
- 40 km/h], fully apply the
manual brake slider.
7 Adjust the “gain” setting,
using the “GAIN” (+/-) selec-
tion buttons, to either
increase or decrease to just
below the point of trailer
wheel lock-up.
Changing settings of the
trailer brake type
Setting the “Gain”