2022 TOYOTA TUNDRA ECU

4186-3. Do-it-yourself maintenance
WARNING
■Pre-driving check
Check that the hood is fully closed and locked.
If the hood is not locked properly, it may open while the vehicle is in motion
and cause an accident, which may result in death or serious inj u r y.
■ After installing the support rod into the slot
Make sure the rod supports the hood securely from falling down on to your
head or body.
NOTICE
■When closing the hood
Be sure to return the support rod to its clip before closing the hood. Closing
the hood with the support rod up could cause the hood to bend.

4696-3. Do-it-yourself maintenance
6
Maintenance and care
WARNING
■Replacing light bulbs
● Turn off the lights. Do not attempt to replace the bulb immedia tely after
turning off the lights.
The bulbs become very hot and may cause burns.
● Do not touch the glass portion of the light bulb with bare hand s. When it is
unavoidable to hold the glass portion, use and hold with a clea n dry cloth
to avoid getting moisture and oils on the bulb.
Also, if the bulb is scratched or dropped, it may blow out or crack.
● Fully install light bulbs and any parts used to secure them. Failure to do so
may result in heat damage, fire, or water entering the headligh t unit. This
may damage the lights or cause condensation to build up on the lens.
● Do not attempt to repair or disassemble the bulb, bulb base, el ectrical wir-
ing, or subcomponents.
Doing so could result in electric shock and serious injury.
■ To prevent damage or fire
● Make sure bulbs are fully seated and locked.
● Check the wattage of the bulb before installing to prevent heat damage.

473
7
When trouble arises
7-1. Essential information
If your vehicle has to be stopped in an
emergency
Steadily step on the brake pedal with both feet and firmly depress it.
Do not pump the brake pedal repeatedly as this will increase th e effort
required to slow the vehicle.
Shift the shift lever to N.
If the shift lever is shifted to N
After slowing down, stop the vehi cle in a safe place by the road.
Stop the engine.
If the shift lever cann ot be shifted to N
Keep depressing the brake pedal with both feet to reduce vehicl e
speed as much as possible.
Vehicles without a smart key
system: Stop the engine by
turning the engine switch to the
“ACC” position.
Vehicles with a smart key sys-
tem: To stop the engine, press
and hold the engine switch for
2 consecutive seconds or more,
or press it briefly 3 times or
more in succession.
Stop the vehicle in a s afe place by the road.
Only in an emergency, such as if it becomes impossible to stop
the vehicle in the normal way, st op the vehicle using the follow-
ing procedure:
1
2
3
4
3
4
Press and hold for 2 seconds or more
or press briefly 3 times or more
Q
R

4777-2. Steps to take in an emergency
7
When trouble arises
The following may indicate a problem with your transmission. Contact
your Toyota dealer or commercial towing service before towing.
● The engine is running but t he vehicle does not move.
● The vehicle makes an abnormal sound.
WARNING
■While towing
● When towing using cables or chains, avoid sudden starts, etc., which
place excessive stress on the towing eyelets, cables or chains. The towing
eyelets, cables or chains may become damaged, broken debris may hit
people, and cause serious damage.
● Do not turn the engine switch to the “LOCK” position (vehicles without a
smart key system) or off (vehicles with a smart key system).
There is a possibility that the steering wheel is locked and ca nnot be oper-
ated.
NOTICE
■ To prevent damage to the vehicle when towing using a wheel-lift type
truck
● Vehicles without a smart key system:
Do not tow the vehicle from the rear when the engine switch is in the
“LOCK” position or the key is removed.
The steering lock mechanism is not strong enough to hold the front wheels
straight.
● Vehicles with a smart key system:
Do not tow the vehicle from the rear when the engine switch is off.
The steering lock mechanism is not strong enough to hold the front wheels
straight.
● When raising the vehicle, ensure adequate ground clearance for towing at
the opposite end of the raised vehicle. Without adequate clearance, the
vehicle could be damaged while being towed.
■ To prevent damage to the vehicle when towing with a sling-type truck
Do not tow with a sling-type truck, either from the front or re a r.
■ To prevent damage to the vehicle during emergency towing
Do not secure cables or chains to the suspension components.
Situations when it is necessary to contact dealers before towing

4797-2. Steps to take in an emergency
7
When trouble arises
If a tow truck is not available in an emergency, your vehicle may be
temporarily towed using cables or chains secured to the emergen cy
towing hook(s). This should only be attempted on hard surfaced roads
for at most 50 miles (80 km) at under 18 mph (30 km/h).
A driver must be in the vehicle to steer and operate the brakes . The
vehicle’s wheels, drivetrain, axles, steering and brakes must b e in
good condition.
Securely attach a cables or chains to the towing hook(s).
Take care not to damage the vehicle body.
Vehicles without a smart key system:
Enter the vehicle being towed and start the engine.
If the engine does not start, turn the engine switch to the “ON ” position.
Vehicles with a smart key system:
Enter the vehicle being towed and start the engine.
If the engine does not start, turn the engine switch to IGNITIO N ON mode.
4WD models: Put the front-wheel drive control switch in “2WD”.
Shift the shift lever to N and release the parking brake.
Vehicles with an automatic trans mission: When the shift lever can-
not be shifted. ( P. 213)
■While towing
If the engine is not running, the power assist for the brakes a nd steering will
not function, making steering and braking more difficult.
Emergency towing
Emergency towing procedure
1
Ty p e AType B
2
3
4

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.

4867-2. Steps to take in an emergency
■If the malfunction indicator lamp comes on while driving
First check the following:
●Is the fuel tank empty?
If it is, fill the fuel tank immediately.
● Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after several driving trips.
If the light does not go off even after several trips, contact your Toyota dealer
as soon as possible.
■
When the tire pressure warning light comes on (if equipped)
Check the tire inflation pressure and adjust to the appropriate level. Push-
ing the tire pressur e warning reset switch will not turn off the tire pressure
warning light.
■The tire pressure warning light may come on due to natural caus es
(if equipped)
The tire pressure warning light may come on due to natural caus es such
as natural air leaks and tire inflation pressure changes caused by tem-
perature. In this case, adjusting the tire inflation pressure w ill turn off the
warning light (after several minutes).
■When a tire is replaced with a spare tire (vehicles with the ti re pres-
sure warning system)
The temporary spare tire is not equipped with a tire pressure w arning
valve and transmitter. If a tire goes flat, the tire pressure w arning light will
not turn off even though the flat tire has been replaced with t he temporary
spare tire. Replace the temporary spare tire with the repaired tire and
adjust the tire inflation pressu re. The tire pressure warning l ight will go off
after several minutes.
■Conditions that the tire pressure warning system may not functi on
properly (if equipped)
 P. 4 3 6
■If the tire pressure warning light frequently comes on after bl inking
for 1 minute (if equipped)
If the tire pressure warning light frequently comes on after bl inking for 1
minute when the engine switch is turned to “ON” position (vehic les with-
out a smart key system) or IGNITION ON mode (vehicles with a sm art
key system), have it checked by your Toyota dealer.
■Warning buzzer
In some cases, the buzzer may not be heard because of noisy pla ce or an
audio sound.

5087-2. Steps to take in an emergency
Once
The electronic key has a low
battery.
Replace the electronic
key battery. ( P. 451)
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.
Interior
buzzerExterior buzzerWarning messageDetails/Actions
(Flashes)