2010 TOYOTA SIENNA brake sensor

188 2-3. Operating the lights and wipers
■Daytime running light system (if equipped)
To make your vehicle more visible to other drivers, the headlights turn on
automatically (at a reduced intensity) whenever the engine is started and the
parking brake is released. Daytime running lights are not designed for use at
night.
■ Headlight control sensor (if equipped)
■ Automatic light off system
●When the light switch is in the
or position with the tail
lights on: The tail lights turn off after driver’s door is opened if the engine
switch has been turned to the “ACC” or “LOCK” position.
● When the light switch is in the or position with the head-
lights on: The headlights and all lights turn off 30 seconds after all the
side doors and back door are closed if the engine switch has been turned
to the “ACC” or “LOCK” position. (The lights turn off immediately if the
on the wireless remote control is pressed after all doors are
locked.)
To turn the lights on again, turn the engine switch to the “ON” position, or
turn the light switch off once and then back to the
or position.
■ Customization that can be co nfigured at Toyota dealer
Settings (e.g. light sensor sensitivity) can be changed.
(Customizable features P. 565)
The sensor may not function properly if
an object is placed on the sensor, or any-
thing that blocks the sensor is affixed to
the windshield.
Doing so interferes with the sensor
detecting the level of ambient light and
may cause the automatic headlight sys-
tem to malfunction.

202 2-4. Using other driving systems
Driving in vehicle-to-vehicle distance control mode This mode employs a laser radar sensor to detect the presence of
vehicles within 400 ft. (120 m) ahead and to judge the distance
between your vehicle and those vehicles.
Note that vehicle-to-vehicle distanc e will close when traveling on long
downhill slopes.
Example of constant speed cruising (when there are no vehicles
ahead):
When set to 62 mph (100 km/h)
The vehicle travels at the speed set by the driver. The desired vehicle-to-
vehicle distance can also be set by operating the vehicle-to-vehicle dis-
tance switch.
Example of deceleration cruising (when the vehicle ahead is driv-
ing slower than the set speed):
When fixed speed cruising is set at 62 mph (100 km/h) and the
vehicle ahead is driving at 50 mph (80 km/h)
When a vehicle is detected running ahead of you, in the same lane, the
system automatically decelerates your vehicle. When a greater reduction
in vehicle speed is necessary, the system applies the brakes. A warning
tone warns you when the system cannot decelerate sufficiently to prevent
your vehicle from closing on the vehicle ahead.

208 2-4. Using other driving systems
CAUTION
■When the laser radar sensor may not be correctly detecting the vehicle
ahead
Apply the brakes as necessary when any of the following types of vehicles
are in front of you.
As the sensor may not be able to correctly detect these types of vehicles,
the proximity alarm ( P. 204) will not be activated, and an accident may
result.
● Vehicles that cut in suddenly
● Vehicles traveling at low speeds
● Vehicles that are not moving
● Vehicles with small rear ends (trailers with no load on board etc.)
● Motorcycles traveling in the same lane
■ Conditions under which the vehicle -to-vehicle distance control may
not function correctly
Apply the brakes as necessary in the following conditions as the laser radar
sensor may not be able to correctly detect vehicles ahead, and an accident
may result.
● When water or snow thrown up by the surrounding vehicles hinders the
functioning of the sensor
● When your vehicle is pointing upwards (caused by a heavy load in the lug-
gage compartment, etc.)
● When the road curves or when the lanes are narrow
● When steering wheel operation or your position in the lane is unstable
■ To ensure the laser rada r sensor functions correctly
Do not do the following to the sensor as doing so may cause the sensor not
to function correctly and could result in an accident.
● Stick or attach anything to it
● Leave it dirty
● Disassemble, subject it to strong shocks
● Modify or paint it
● Replace it with non-genuine parts

213
2-4. Using other
driving systems
2
When driving
■Sensor detection information
●Certain vehicle conditions and the surrounding environment may affect
the ability of the sensor to correctly detect obstacles. Particular instances
where this may occur are listed below.
• There is dirt, snow or ice on the sensor.
• The sensor is frozen.
• The sensor is covered in any way.
• The vehicle is leaning considerably to one side.
• On an extremely bumpy road, on an incline, on gravel, or on grass
• The vicinity of the vehicle is noisy due to vehicle horns, motorcycle
engines, air brakes of large vehicles, or other loud noises producing
ultrasonic waves.
• There is another vehicle equipped with parking assist sensors in the vicinity.
• The sensor is coated with a sheet of spray or heavy rain.
• The vehicle is equipped with a fender pole or wireless antenna.
• The bumper or sensor receives a strong impact.
• The vehicle is approaching a tall or curved curb.
• In harsh sunlight or intense cold weather
In addition to the examples above, there are instances in which, because of
their shapes, signs and other objects may be judged by the sensor to be
closer than they are.
● The shape of the obstacle may prevent the sensor from detecting it. Pay
particular attention to the following obstacles:
• Wires, fences, ropes etc.
• Cotton, snow and other materials that absorb radio waves
• Sharply-angled objects
• Low obstacles
• Tall obstacles with upper sections projecting outwards in the direction
of your vehicle
• Objects just under the bumper
• Objects very close to your vehicle
• A person near the vehicle (depending on the type of clothes worn)

502
5-1. Essential information
Event data recorder
In a crash or a near car crash eventThe SRS airbag sensor assembly contains the EDR. In a crash or a
near car crash event, this device may record some or all of the follow-
ing information:
● Engine speed
● Whether the brake pedal was applied or not
● Vehicle speed
● To what extent the accelerator pedal was depressed
● Position of the transmission shift lever
● Whether the driver and front passenger wore seat belts or not
● Driver's seat position
● SRS airbag deployment data
● SRS airbag system diagnostic data
● Front passenger's occupant classification
The information above is intended to be used for the purpose of
improving vehicle safety performan ce. Unlike general data recorders,
the EDR does not record sound data such as conversation between
passengers.
Your vehicle has computers that monitor and control certain aspects
of your vehicle. These computers assi st in driving and maintaining
optimal vehicle performance.
Besides storing data useful for tr oubleshooting, there is an event
data recorder (EDR) that records data in a crash or a near car
crash event.

584 Alphabetical index
MaintenanceDo-it-yourself
maintenance ....................... 430
General maintenance ............ 426
Maintenance data.................. 542
Maintenance requirements.... 424
Meter Instrument panel light
control ................................. 176
Meters ................................... 174
Mirrors
Conversation mirror............... 386
Inside rear view mirror.............95
Side mirror heaters................260
Side mirrors .............................97
Vanity mirrors ........................ 384
Moon roof ................................. 104
MP3 disc ................................... 279
Noise from under vehicle ..........20
Note pad holder........................ 381
Odometer .................................. 174
Oil
Engine oil .............................. 439
Opener Back door ................................47
Fuel filler door ....................... 107
Hood...................................... 434
Outer foot lights
Outer foot lights ..................... 361
Replacing light bulbs ............. 486
Wattage ................................. 549
Outside rear view mirrors Adjusting and folding ...............97
Driving position memory..........80
Overheating, Engine ................536 Parking assist sensors............ 209
Parking brake ........................... 173
Parking lights
Replacing light bulbs ............. 486
Switch ................................... 185
Wattage................................. 549
Personal lights Switch ................................... 362
Wattage................................. 549
Power outlets ........................... 387
Power windows ................ 100, 102
Quarter windows...................... 102
Radiator .................................... 446
Radio ......................................... 265
Rear automatic air conditioning system ............. 256
Rear manual air conditioning system .................................... 253
Rear seat
Adjustment ........................ 59, 61
Folding third seats............. 71, 72
Installing second seats............ 66
Removing second seats.......... 65
Seating configurations ............ 63
Stowing third seats............ 73, 75
Tumbling second seats ........... 63
Rear seat entertainment system Initial setting .......................... 320
Rear seat entertainment
system ................................ 296
Rear side marker lights
Replacing light bulbs ............. 486
Wattage................................. 549M
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