sensor TOYOTA SEQUOIA 2021 (in English) Service Manual

3044-5. Using the driving support systems
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The RCTA functions when your vehicle is in reverse. It can dete ct
other vehicles approaching from the right or left rear of the v ehicle. It
uses radar sensors to alert the driver of the other vehicle’s existence
through flashing the outside rear view mirror indicators and so unding
a buzzer.
RCTA function
Approaching vehicles Detection areas
WARNING
■Cautions regarding the use of the function
The driver is solely responsible for safe driving. Always drive safely, taking
care to observe your surroundings.
The RCTA function is only an assist and is not a replacement fo r careful
driving. Driver must be careful when backing up, even when usin g RCTA
function. The driver’s own visual confirmation of behind you an d your vehi-
cle is necessary and be sure there are no pedestrians, other ve hicles, etc.,
before backing up. Failure to do so could cause death or seriou s injury.
According to conditions, the system may not function correctly. Therefore
the driver’s own visual confirmation of safety is necessary.

3064-5. Using the driving support systems
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Conditions under which the RCTA function will not detect a vehicle
The RCTA 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 the conditions, detection of a vehicle and/or obj ect may
occur.
■ Conditions under which the RCTA function may not function corre ctly
● The RCTA function may not detect vehicles correctly in the following situa-
tions:
• When the sensor is misaligned due to a strong impact to the se nsor or its
surrounding area
• When mud, snow, ice, a sticker, etc., is covering the sensor o r surround-
ing area on the rear bumper
• When driving on a road surface that is wet with standing water during bad
weather, such as heavy rain, snow, or fog
• When multiple vehicles are approaching with only a small gap b etween
each vehicle
• When a vehicle is approaching at high speed
• When your vehicle is towing a trailer

3074-5. Using the driving support systems
4
Driving
SEQUOIA_OM_USA_OM0C035U• Immediately after the RCTA function is set to on
• Immediately after the engine is started with the RCTA function
is set to on
• When backing up on a slope with a
sharp change in grade
• When backing out of a shallow angle parking spot
• When the sensors cannot detect a vehicle due to obstructions

3965-4. Other interior features
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WARNING
■While driving the vehicle
Do not adjust the display. Be sure to adjust the display only when the vehi-
cle is stopped.
■ When doing the circling calibration
Be sure to secure a wide space, and watch out for people and ve hicles in
the neighborhood. Do not violate any local traffic rules while performing cir-
cling calibration.
NOTICE
■ To avoid the compass malfunctions
Do not place magnets or any metal objects near the inside rear view mirror.
Doing this may cause a malfunction of the compass sensor.
■ To ensure normal operation of the compass
● Do not perform circling calibration of the compass in a place w here the
earth’s magnetic field is subject to interference by artificial magnetic fields.
● During calibration, do not operate electric systems (moon roof, power win-
dows, etc.) as they may interfere with the calibration.

4747-2. Steps to take in an emergency
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■If the malfunction indicator lamp comes on while driving
First check the following:
●Is your vehicle low on gas?
If it is, refuel the vehicle immediately.
● Is the fuel tank cap loose?
If it is, tighten it securely.
The light will go off after taking several driving trips.
If the light does not go off even after several trips, contact your Toyota dealer
as soon as possible.
■ SRS warning light
This warning light system monitors the airbag sensor assembly, front impact
sensors, side impact sensors (front door), side impact sensors (rear), driver’s
seat position sensor, driver’s seat belt buckle switch, front passenger occu-
pant classification system (ECU and sensors), “AIR BAG ON” indi cator light,
“AIR BAG OFF” indicator light, front passenger’s seat belt buck le switch, seat
belt pretensioners, airbags, interconnecting wiring and power s ources.
( P. 40)
■ 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.
■ If the low speed four-wheel drive indicator light or center dif ferential lock
indicator light blinks
Take the specified steps. ( P. 315)
■ Four-wheel drive system warning buzzer
The buzzer indicated that the transfer mode is not selected cor rectly.

4807-2. Steps to take in an emergency
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Indicates a malfunction in the rear height control
air suspension (if equipped)The malfunctioning assist-sensor is flashing.
 Immediately stop the vehicle in a safe place
and contact your Toyota dealer
Indicates a malfunction in the SRS airbag system
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the automatic transmis-
sion system
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the Brake Override
system
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the Drive-start control
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the cruise control sys-
tem
• Press the “ON-OFF” button once to deacti-vate the system, and then press the button
again to reactivate the system.
• A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Warning messageDetails/Actions
AIR SUSPENSION
System Malfunction
Visit Your Dealer
SRS Airbag System Malfunction
Visit Your Dealer
CHECK
TRANSMISSION SYSTEM
Brake Override Malfunction
Visit Your Dealer
Drive-Start Control
Malfunction
Visit Your Dealer
Cruise Control Malfunction
Visit Your Dealer

4817-2. Steps to take in an emergency
7
When trouble arises
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Indicates a malfunction in the BSM (Blind Spot
Monitor)A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the RCTA (Rear Cross
Traffic Alert)
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in the intuitive parking
assist sensor (if equipped)
The malfunctioning assist-sensor is flashing.
 Have the vehicle inspected by your Toyota
dealer immediately.
Indicates a malfunction in:
• The automatic headlight leveling system; or
• The LED headlight system.
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates a malfunction in the tire pressure
monitoring system
Stop the vehicle in a safe place and turn
the engine off then start again.
If the tire pressure warning indicator
flashes for 1 minute then illuminates,
there is a malfunction in the system.
Have the vehicle inspected by your Toy-
ota dealer.
Indicates that the BSM (Blind Spot Monitor) sen-
sors or the surrounding area on the bumper is
dirty or covered with ice
A buzzer also sounds.
 Clean the sensor and its surrounding area
on the bumper.
Warning messageDetails/Actions
Blind Spot Monitor Malfunction
Visit Your Dealer
Rear Cross Traffic Alert Malfunction
Visit Your Dealer
Parking Assist Malfunction
Headlight System Malfunction
Visit Your Dealer
Tire Pressure Warning System Malfunction, Visit Your Dealer
(Flashes and
then remains
on)
Blind Spot Monitor
Unavailable

4827-2. Steps to take in an emergency
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Indicates that the RCTA (Rear Cross Traffic Alert)
sensors or the surrounding area on the bumper is
dirty or covered with iceA buzzer also sounds.
 Clean the sensor and its surrounding area
on the bumper.
Indicates that the engine was stopped with the
shift lever not in P. A buzzer also sounds.
 Shift the shift lever to P.
Indicates that the engine was stopped while driv-
ing.
A buzzer also sounds.
 Stop the vehicle in a safe place such as the
shoulder of a road.
Indicates that one or more of the doors or the
hood is not fully closed
The system also indicates which doors are not
fully closed. If the vehicle reaches a speed of
3 mph (5 km/h), flashes and a buzzer
sounds to indicate that the door(s) are not yet
fully closed.
 Make sure that all the doors and the hood
are closed.
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 br ake is still engaged.
Release the parking brake.
Indicates that the accelerator and brake pedals
are being depressed simultaneously, and the
Brake Override System is operating. ( P. 177)
 Release the accelerator pedal and depress
the brake pedal.
Warning messageDetails/Actions
Rear Cross Traffic Alert
Unavailable
Engine Stopped Shift Into P
(Flashes)
Engine Stopped
Stop in a Safe Place
(Flashes)
(Flashes)
Release
Parking Brake
(Flashes)
Accelerator and
Brake Pedals Pressed
Simultaneously

4837-2. Steps to take in an emergency
7
When trouble arises
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Indicates the following:• The brake fluid level is low; or
• The brake system is malfunctioning.
 Immediately stop the vehicle in a safe place
and contact your Toyota dealer.
Indicates remaining fuel is approximately 4.0 gal.
(15.0 L, 3.3 Imp.gal.) or less
A buzzer also sounds.
 Refuel the vehicle.
Indicates that the tire inflation pressure is low
Check the tire inflation pressure, and
adjust to the appropriate level.
Indicates that the washer fluid level is low
 Add washer fluid.
Indicates that intuitive parking assist sensor is
dirty or covered with ice (if equipped)
Clean the sensor.
Indicates that the headlight switch is in or
position (with the key removed and the
driver’s door opened) A buzzer also sounds.
 Turn the lights off.
Indicates that the moon roof is not fully closed
(with the engine switch off, and the driver’s door
open)
A buzzer also sounds.
 Close the moon roof.
Indicates that all maintenance according to the
driven distance on the maintenance schedule
*
should be performed soon.
Comes on approximately 4500 miles (7200 km)
after the message has been reset.
If necessary, perfo rm maintenance.
Warning messageDetails/Actions
Check Brake System
Fuel Low
Tire Pressure Low
Check Tire
Windshield
Washer Fluid Low
Clean Parking Assist Sensor
Turn Lights Off
(Flashes)
Moon Roof Open
(Flashes)
Maintenance
Required Soon

4847-2. Steps to take in an emergency
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Indicates that all maintenance is required to cor-
respond to the driven distance on the mainte-
nance schedule
*.
Comes on approximately 5000 miles (8000 km)
after the message has been reset.
(The indicator will not work properly unless the
message has been reset.)
 Perform the necessary maintenance.
Please reset the message after the mainte-
nance is performed. ( P. 406)
Indicates a malfunction in the PCS (Pre-Collision
System).
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
Indicates a malfunction in the LDA (Lane Depar-
ture Alert).
A buzzer also sounds.
 Have the vehicle inspected by your Toyota
dealer.
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.
Indicates that LDA (Lane Departure Alert) system
cannot be used due to the vehicle speed being
too high.
Slow down.
Indicates that radar cruise control sensor is dirty
or covered with ice.
A buzzer also sounds.
 Clean the sensor.
Warning messageDetails/Actions
Maintenance
Required
Visit Your Dealer
Pre-Collision System Malfunction
Visit Your Dealer
LDA
Malfunction
Visit Your Dealer
(Yellow)
LDA
Unavailable
Below Approx. 32MPH
LDA
Unavailable
at Current Speed
Radar Cruise Control
Unavailable
Clean Sensor