warning light TESLA MODEL X 2023 User Guide

Braking SystemsWARNING: Properly functioning braking systems
are critical to ensure safety. If you experience a
problem with the brake pedal, brake calipers, or
any component of a Model X braking system,
contact Tesla immediately.
Model X has an anti-lock braking system (ABS) that
prevents the wheels from locking when you apply
maximum brake pressure. This improves steering control
during heavy braking in most road conditions.
During emergency braking conditions, the ABS
constantly monitors the speed of each wheel and varies
the brake pressure according to the grip available.
The alteration of brake pressure can be felt as a pulsing sensation through the brake pedal. This demonstrates that the ABS is operating and is not a cause for concern. Keep
firm and steady pressure on the brake pedal while
experiencing the pulsing.
The ABS indicator briefly flashes amber on
the
instrument panel when you first start
Model X. If this indicator lights up at any
other time, an ABS fault has occurred and the ABS is not operating. Contact Tesla.
The braking system remains fully
operational and is not
affected by an ABS
failure. However, braking distances may increase. Drive cautiously and avoid heavy braking.
If the instrument panel displays this red
brake indicator at any time other than
briefly when you first start Model X, a
brake system fault is detected, or the level
of the brake
fluid is low. Contact Tesla
immediately. Apply steady pressure and keep the brakes
firm to bring the vehicle to
a stop when safe to do so.
The instrument panel displays this amber
brake indicator if a brake booster fault is detected. Apply steady pressure and keep the brakes
firm to stop the vehicle when
safety permits. Hydraulic Boost Compensation will be active (see
Hydraulic
Boost Compensation on page 77).
Emergency Braking
In an emergency, fully press the brake pedal and
maintain
firm pressure, even on low traction surfaces.
The ABS varies the braking pressure to each wheel
according to the amount of traction available. This prevents wheels from locking and ensures that you stop as safely as possible.
WARNING: Do not pump the brake pedal. Doing so
interrupts operation of the ABS and can increase
braking distance.
WARNING: Always maintain a safe distance from
the vehicle in front of you and be aware of
hazardous driving conditions. While the ABS can
improve stopping distance, it cannot overcome the
laws of physics. It also does not prevent the
danger of hydroplaning (where a layer of water
prevents direct contact between the tires and the
road).
CAUTION: Automatic Emergency Braking (see
Automatic Emergency Braking on page 132) may
intervene to automatically brake in situations
where a collision is considered imminent.
Automatic Emergency Braking is not designed to
prevent a collision. At best, it can minimize the
impact of a frontal collision by attempting to
reduce your driving speed. Depending on
Automatic Emergency Braking to avoid a collision
can result in serious injury or death.
Dynamic Brake Lights (if equipped)
If you are driving over 30 mph (50 km/h) and brake
forcefully
(or if Automatic Emergency Braking engages),
the brake lights
flash quickly to warn other drivers that
Model X is rapidly slowing down. If Model X stops
completely, the hazard warning lights
flash. Flashing
continues until you press the accelerator or manually press the hazard lights button to turn them
off (see
Hazard Warning Flashers on page 70).
NOTE: When towing a trailer (if applicable), the brake
lights on the trailer also operate as described above,
even when the trailer is not equipped with a separate
braking system.
WARNING: When towing a trailer (if applicable),
always increase your following distance. Sudden
braking may result in skidding, jack-knifing, and
loss of control.
Brake Disc Wiping
To ensure brakes remain responsive in cold and wet
weather,
Model X is equipped with brake disc wiping.
When cold and wet weather is detected, this feature
repeatedly applies an imperceptible amount of brake
force to remove water from the surface of the brake
discs.
Hydraulic Fade Compensation
Model X is equipped with hydraulic fade compensation.
This assists in monitoring brake system pressure and ABS activity for instances of reduced brake
performance. If reduced brake performance is detected (for example, as a result of brake fade, or cold or wet
conditions), you may hear a sound, feel the brake pedal pull away from your foot, and notice a strong increase in
Braking and Stopping
76MODEL X Owner

Tire Pressures when Towing
When towing a trailer, tire pressures must be adjusted to accommodate the additional load. Keep tires
inflated to
the pressures shown below (these pressures override the pressures that are provided on the Tire and Loading
information label):
Front TiresRear TiresCold Tire Inflation Pressure
255/45R20
265/45R20
275/45R2046 psi (320 kPa)265/35ZR22285/35ZR2250 psi (345 kPa)
WARNING: Check tire pressures using an accurate
pressure gauge when tires are cold. Driving one
mile (1.6 km) warms the tires sufficiently to affect

tire pressures. Parking the vehicle in direct sunlight
or in hot weather can also affect tire pressures. If
you must check warm tires, expect increased
pressures. Do not let air out of warm tires in an
attempt to match recommended cold tire
pressures. A hot tire at or below the recommended
cold tire inflation pressure is dangerously under-
inflated.
WARNING: Never attempt to tow a trailer when a
Model X tire is faulty or has been inflated using a
tire repair kit. A temporarily repaired tire is not
designed to sustain the towing load. Towing using
a faulty or temporarily repaired tire can result in
tire failure and loss of vehicle stability.
Before Towing a Trailer
Before towing a trailer, you must do the following:

4. To change your speed while using Traffic-Aware
Cruise Control, you can roll the right scroll wheel on
the steering wheel up or down. For more details, see
Changing the Cruising Speed on page 102.
5.
To cancel Traffic-Aware Cruise Control, press the right
scroll wheel, or press the brake pedal. See
Canceling
and Resuming on page 104 for more information.
Set Traffic-Aware Cruise Control
Chime
If you want a chime to sound when you engage or cancel
Traffic-Aware Cruise Control, touch Controls >
Autopilot > Traffic-Aware Cruise Control Chime.
NOTE: Model X must be in Park.
Changing the Cruising Speed
Roll the right scroll wheel up to increase, or down to decrease, the set speed. Slowly rolling the scroll wheel
changes the set speed in
1 mph (1 km/h) increments and
quickly rolling the scroll wheel changes the set speed to the closest
5 mph (5 km/h) increment. For example, if
you are traveling at
57 mph and quickly roll the scroll
wheel, the speed increases to
60 mph.
NOTE: It may take a few seconds for Model X to reach
the new cruising speed, assuming
Model X is not
cruising behind a vehicle that is driving slower than your
set speed.
Cruising at the Set Speed
Traffic-Aware Cruise Control maintains your set cruising
speed whenever a vehicle is not detected in front of
Model X. When cruising behind a detected vehicle,
Traffic-Aware Cruise Control accelerates and decelerates
Model X as needed to maintain a chosen following
distance (see
Adjust the Following Distance on page
103), up to the set speed.
Traffic-Aware Cruise Control also adjusts the cruising
speed when entering and exiting curves.
You can manually accelerate at any time when cruising
at a set speed, but when you release the accelerator,
Traffic-Aware Cruise Control resumes cruising at the set
speed.
NOTE: When Traffic-Aware Cruise Control is actively
slowing down
Model X to maintain the selected distance
from the vehicle ahead, brake lights turn on to alert other road users that you are slowing down. You may
notice slight movement of the brake pedal. However,
when
Traffic-Aware Cruise Control is accelerating
Model X, the accelerator pedal does not move.
WARNING: Traffic-Aware Cruise Control may
occasionally cause Model X to brake when not
required or when you are not expecting it. This can
be caused by closely following a vehicle ahead,
detecting vehicles or objects in adjacent lanes
(especially on curves), etc.
WARNING: Due to limitations inherent in the
onboard GPS (Global Positioning System), you
may experience situations in which Model X slows
down, especially near exits or off-ramps where a
curve is detected and/or you are navigating to a
destination and not following the route.
WARNING: Traffic-Aware Cruise Control may not
detect all objects and, especially when cruising
over 50 mph (80 km/h), may not brake/decelerate
when a vehicle or object is only partially in the
driving lane or when a vehicle you are following
moves out of your driving path and a stationary or
slow-moving vehicle or object is in front of you.
Always pay attention to the road ahead and stay
prepared to take immediate corrective action.
Depending on Traffic-Aware Cruise Control to
avoid a collision can result in serious injury or
death. In addition, Traffic-Aware Cruise Control
may react to vehicles or objects that either do not
exist, or are not in your lane of travel, causing
Model X to slow down unnecessarily or
inappropriately.
WARNING: Traffic-Aware Cruise Control may be
unable to provide adequate speed control because
of limited braking capability and hills. It can also
misjudge the distance from a vehicle ahead.
Driving downhill can increase driving speed,
causing Model X to exceed your set speed (and
potentially the road

NOTE: Depending on market region, vehicle
configuration, options purchased, and software version,
your vehicle may not be equipped with Autosteer, or the
feature may not operate exactly as described.
NOTE: Autosteer is a BETA feature.
Autosteer builds upon Traffic-Aware Cruise Control (see
Traffic-Aware Cruise Control on page 101), intelligently
keeping
Model X in its driving lane when cruising at a set
speed.
Autosteer also allows you to use the turn signals
to move Model X into an adjacent lane (see Auto Lane
Change on page 107). Autosteer detects lane markings
and the presence of vehicles and objects to
steer
Model X.
NOTE: To display more details about the roadway and its
surroundings, such as road markings, stop lights, objects (such as trash cans and poles), etc., touch
Controls >
Autopilot > Full Self-Driving Visualization Preview (if
equipped).
CAUTION: Ensure all cameras and sensors (if
equipped) are clean. Dirty cameras and sensors, as
well as environmental conditions such as rain and
faded lane markings, affect performance.
WARNING: Autosteer is a hands-on feature. You
must keep your hands on the steering yoke (or
steering wheel) at all times.
WARNING: Autosteer is intended for use on
controlled-access highways with a fully attentive
driver. When using Autosteer, hold the steering
yoke (or steering wheel) and be mindful of road
conditions and surrounding traffic. Do not use
Autosteer in construction zones, or in areas where
bicyclists or pedestrians may be present. Never
depend on Autosteer to determine an appropriate
driving path. Always be prepared to take
immediate action. Failure to follow these
instructions could cause damage, serious injury or
death.
Operating Autosteer
Before you can operate Autosteer, you must enable it by touching
Controls > Autopilot > Autosteer (Beta).
To indicate that Autosteer is available (but
not actively steering
Model X), the
instrument panel displays a gray Autosteer
icon.
Steering yoke option
To initiate Autosteer, press the right scroll wheel.
NOTE: If the setting for Autosteer Activation is set to
Single Click (touch Controls > Autopilot > Autosteer
Activation), Autosteer engages when you single-press
the right scroll wheel. If set to
Double Click, you must
double-press the right scroll wheel to engage Autosteer.
To indicate that Autosteer is now actively
steering
Model X, the instrument panel
displays the Autosteer icon in blue. When
Autosteer is able to detect lane markings,
it also displays the driving lane in blue.
Steering yoke option
Autosteer briefly displays a message on the instrument
panel reminding you to pay attention to the road and be
ready to take over at any time.
The speed at which you can initiate Autosteer can vary depending on various conditions and whether or not a
vehicle is detected ahead of you. When no vehicle is
detected ahead of you, you must be driving at least
18 mph (30 km/h), unless certain vehicle and
environmental conditions are met, in which case, you
may be able to initiate it at lower speeds. When a
vehicle is detected ahead of you, you can initiate
Autosteer at any speed, even when stationary, provided
Model X is at least 5 feet (150 cm) behind the detected
vehicle.
NOTE: Auto High Beam is automatically enabled when
Autosteer is engaged and the maximum cruising speed is
85 mph (140 km/h).
CAUTION: If available in your market region,
Model X detects lights from an emergency vehicle
when using Autosteer at night on a high speed
road, the driving speed is automatically reduced
and the instrument panel displays a message
informing you of the slowdown. You will also hear
a chime and see a reminder to keep your hands on
the steering yoke (or steering wheel). When the
light detections pass by or cease to appear,
Autopilot resumes your cruising speed.
Alternatively, you may tap the accelerator to
resume your cruising speed.
WARNING: Never depend on Autopilot features to
determine the presence of emergency vehicles.
Model X may not detect lights from emergency
vehicles. Keep your eyes on your driving path and
always be prepared to take immediate action.
In situations where Autosteer is temporarily unavailable, the Autosteer icon disappears. For example, your driving speed is not within the speed required for Autosteer to operate. Autosteer may also be unavailable if it is not receiving adequate data from the camera(s).
Autosteer
105Autopilot

NOTE: In low light conditions (dusk or dark), Autosteer
aborts or is unavailable if headlights are set to
Off. For
best results, set headlights to
Auto.
If unable to detect lane markings, Autosteer may determine the driving lane based on a vehicle you are
following.
In most cases, Autosteer attempts to center Model X in
the driving lane. However, there may be situations in which Autosteer may steer
Model X in a driving path
that is
offset from the center of the lane (for example,
detection of guard rails).
WARNING: Autosteer is not designed to, and will
not, steer Model X around objects partially in a
driving lane and in some cases, may not stop for
objects that are completely blocking the driving
lane. Always watch the road in front of you and
stay prepared to take immediate action. It is the
driver

In situations where Auto Lane Change is unable to operate at optimal performance, or cannot operate due to inadequate data, the
instrument panel displays a
series of warnings. Therefore, when using Auto Lane
Change, always pay attention to the
instrument panel
and be prepared to manually steer Model X.
Adjacent Lane Speed
NOTE: Depending on market region, vehicle
configuration, options purchased, and software version,
your vehicle may not be equipped with Adjacent Lane
Speed, or the feature may not operate exactly as
described.
When moving significantly faster than vehicles in
adjacent lanes,
Model X automatically reduces the
driving speed. This is especially helpful in heavy
traffic
situations or when vehicles are constantly merging into
different lanes. When Model X detects other vehicles
driving
significantly slower, the instrument panel
highlights the adjacent lanes with arrows and detected
vehicles in gray, and
Model X reduces the driving speed
as appropriate. To temporarily override this feature,
press the accelerator pedal.
WARNING: Never depend on Autopilot to
determine a safe driving speed; you are
responsible for driving safely and according to
traffic laws in your market region.
Stop Light and Stop Sign Warning
NOTE: Depending on market region, vehicle
configuration, options purchased, and software version,
your vehicle may not be equipped with Stop Light and
Stop Sign Warning, or the feature may not operate
exactly as described.
While Autosteer is in use, Model X displays a warning on
the
instrument panel and sounds a chime if it detects
that you are likely to run through a red stop light or stop sign. If this happens,
TAKE IMMEDIATE CORRECTIVE
ACTION!
The visual and audible warnings cancel after a few seconds, or when you press the brake pedal, whichever
comes
first.
Stop Light and Stop Sign Warning provides warnings
only. It does not slow down or stop
Model X at red traffic
lights, stop signs, road markings, etc. If equipped with
Traffic Light and Stop Sign Control, you can enable this
feature to automatically stop Model X at traffic lights
and stop signs (see Traffic Light and Stop Sign Control
on page 113).
CAUTION: Stop Light and Stop Sign Warning
requires on-board maps to know that a particular
stop light or stop sign exists at a location. In some
cases, map data is inaccurate or outdated and may
not include all stop lights or stop signs. Therefore,
Stop Light and Stop Sign Warning may not detect
all stop lights and stop signs.
WARNING: The Stop Light and Stop Sign Warning
feature does not apply the brakes or decelerate
Model X and may not detect all stop lights and
stop signs. Stop Light and Stop Sign Warning is
designed for guidance purposes only and is not a
substitute for attentive driving and sound
judgment. Keep your eyes on the road when
driving and never depend on Stop Light and Stop
Sign Warning to warn you of a stop light or stop
sign.
WARNING: Stop Light and Stop Sign Warning is
designed to warn you only when approaching a
visible red stop sign, solid red or later portion of a
yellow traffic light. It may not warn you of
intersections with flashing lights and it does not
warn you of yield signs or temporary stop and
yield signs (such as those used in construction
areas). Additionally, Stop Light and Stop Sign
Warning does not warn you of approaching stop
lights or stop signs when you are pressing the
accelerator pedal or brake pedal (which disables
Autosteer).
Limitations
Autosteer and its associated functions are particularly
unlikely to operate as intended when:

Stop Signs and Road Markings
When driving with Autosteer or Traffic-aware Cruise Control engaged, and Traffic Light and Stop Sign Control
enabled,
Model X is designed to respond as follows when approaching intersections controlled by stop signs, stop
lines, or road markings:
Type of IntersectionVehicle Intended Response
No Traffic Control
Arm of T-junction
Model X assumes the right of way and continues straight without slowing down or
stopping.
End of T-junction
If Model X detects a T-junction based on the map data, Model X slows down and
comes to a complete stop at the red stop line displayed on the
instrument panel.
When you want to proceed, you must take over steering and acceleration.
WARNING: Model X may not stop at a T-junction that does not have a stop
sign or stop line, or if the T-junction is not included in the map data. Drive
attentively and be prepared to stop (when necessary and/or appropriate).
Stop Sign
Model X slows down and comes to a complete stop at the red stop line displayed on
the
instrument panel. When you want to proceed through the intersection, you must
briefly press the accelerator pedal.
NOTE: If you confirm that you want to proceed through an intersection controlled by
a stop sign by
briefly pressing the accelerator pedal before Model X has stopped,
your
confirmation is ignored. Model X is not designed to proceed through a stop
sign without stopping.
NOTE: Even when using Autosteer, and even if you have engaged a turn signal, you
must turn the
steering yoke (or steering wheel) yourself (which cancels Autosteer)
to complete a turn at an intersection.
Traffic Light and Stop Sign Control
117Autopilot

Type of IntersectionVehicle Intended Response
Stop Sign and Road Marking
Road Marking
WARNING: Model X also slows down and stops at a roundabout. You must take over steering (which cancels
Autosteer) and briefly press the accelerator pedal to confirm that you want to continue through the
roundabout.
WARNING: At crosswalks, Model X may slow down and may stop, depending on whether the crosswalk is
controlled by a traffic light and whether the cameras detect pedestrians, bicyclists, etc. in the crosswalk. Pay
particular attention at crosswalks and be prepared to take over at any time. Failure to do so can result in injury
or death.
Limitations
Depending on many different circumstances and environmental conditions, Traffic Light and Stop Sign Control may
or may not stop at:

During Charging
During charging, the charge port light pulses green, and the
touchscreen displays real-time charging status. The
frequency at which the green charge port light pulses
slows down as the charge level approaches full. When charging is complete, the light stops pulsing and is solid green.
NOTE: If Model X is locked, the charge port light does
not light up.
If the charge port light turns red while charging, a fault
is detected. Check the
instrument panel or touchscreen
for an alert describing the fault. A fault can occur due to something as common as a power outage. If a power
outage occurs, charging resumes automatically when power is restored.
NOTE: The thermal system may produce steam under
certain conditions. For example, odorless steam can come from the front of your vehicle while charging at a Supercharger in cold temperature. This is normal and not a cause for concern.
NOTE: It is normal to hear sounds during charging.
Particularly at high currents, the refrigerant compressor and fan operate as needed to keep the Battery cool.
NOTE: Air conditioning performance is generally not
affected by charging. However, in some circumstances
(for example, charging at high currents during a particularly warm day), the air coming from the vents may not be as cool as expected and a message displays on the
instrument panel. This is normal and ensures that
the Battery stays within an optimum temperature range while charging to support longevity and optimum
performance.
WARNING: Never spray liquid at a high velocity
(for example, a pressure washer) towards the
charge port while charging. Doing so can result in
serious injury or damage to the vehicle, charging
equipment, or property.
Stopping Charging
Stop charging at any time by disconnecting the charge
cable or touching
Stop Charging on the touchscreen.
NOTE: To prevent unauthorized unplugging of the
charge cable, the charge cable latch remains locked and
Model X must be unlocked or able to recognize your key
before you can disconnect the charge cable.
To disconnect the charge cable:
1.
Press and hold the button on the connector handle to release the latch.
NOTE: You can also release the latch using the
touchscreen or mobile app, or by pressing and
holding the rear trunk button on the key fob.
If your
vehicle is equipped with a motorized charge port,
you can also press the button to the left of the
charge port to release the latch.
2.
Pull the connector from the charge port. The charge
port door automatically closes.
To disconnect the charge cable when using an adapter at a public charge station:
1.
Unlock Model X.
2.
While holding the public charging handle in one hand and the adapter in the other hand, press and hold the button on the public charging handle and pull both
outwards, removing the handle and adapter at the same time.
NOTE: If the charging station handle separates from
the adapter, leaving the adapter in
Model X, use the
touchscreen to unlock the charge port.
3.
Press and hold the button on the charging handle
again to release the adapter from the public charging handle.
NOTE: The charge port door automatically closes within
approximately 10 seconds of removing the connector from the charge port.
CAUTION: Tesla strongly recommends leaving
Model X plugged in when not in use. This
maintains the Battery at the optimum level of
charge.
Charge Settings
Access charge settings by touching Controls > Charging
when Model X is in Park.
When charging, you can also touch the
charge icon on the touchscreen to access charge settings.1.
Driving distance: Displays the total estimated driving
distance available.
Charging Instructions
182MODEL X Owner

Cautions for Exterior CleaningCAUTION: Do not wash in direct sunlight.CAUTION: Do not use windshield treatment fluids.

Doing so can interfere with wiper friction and
cause a chattering sound.
CAUTION: Do not use hot water, detergents, or
highly alkaline or caustic cleaning products,
especially those containing hydroxide.
CAUTION: If using a pressure washer, maintain a
distance of at least 12" (30 cm) between the
nozzle and the surface of Model X. Avoid aiming
the water jet directly at parking sensors (if
equipped). Keep the nozzle moving and do not
concentrate the water jet on any one area.
CAUTION: Do not aim water hoses directly at
windows, door, or hood seals or at electronic
modules or exposed cabling.
CAUTION: To avoid corrosive damage that may
not be covered by the warranty, rinse away any
road salt from the underside of the vehicle, wheel
wells, and brakes. After cleaning the vehicle, dry
the brakes by going on a short drive and applying
the brakes multiple times.
CAUTION: Avoid using tight-napped or rough
cloths, such as washing mitts. A high-quality
microfiber cleaning cloth is recommended.
CAUTION: If washing in an automatic car wash, use
touchless car washes only. These car washes have
no parts (brushes, etc.) that touch the surfaces of
Model X. Some touchless car washes use caustic
solutions that, over time, can cause discoloration
of decorative exterior trim. Avoid exposure to
soaps and chemicals above pH 13. If unsure, check
the product label or ask the staff at the car wash.
Damage caused by improper washing is not
covered by the warranty.
CAUTION: If washing in an automatic car wash,
make sure the vehicle is locked. In addition, avoid
using controls on the touchscreen that can result
in accidentally opening doors or trunks while the
vehicle is being washed. Any damage caused is
not covered by the warranty.
CAUTION: Ensure the wipers are off before
washing Model X to avoid the risk of damaging the
wipers.
CAUTION: Do not use chemical based wheel
cleaners or pre-wash products. These can damage
the finish on the wheels.
WARNING: Never spray liquid at a high velocity
(for example, if using a pressure washer) towards
the charge port while Model X is charging. Failure
to follow these instructions can result in serious
injury or damage to the vehicle, charging
equipment, or property.
Cleaning the Interior
Frequently inspect and clean the interior to maintain its
appearance and to prevent premature wear. If possible,
immediately wipe up spills and remove marks. For
general cleaning, wipe interior surfaces using a soft cloth (such as
microfiber) dampened with a mixture of warm
water and mild non-detergent cleaner (test all cleaners on a concealed area before use). To avoid streaks, dry immediately with a soft lint-free cloth.
Interior Glass
Do not scrape, or use any abrasive cleaning fluid on
glass or mirrored surfaces. This can damage the
reflective surface of the mirror and the heating elements
in the rear window.
Airbags
Do not allow any substance to enter an airbag cover. This could
affect correct operation.
Dashboard and Plastic Surfaces
Do not polish the upper surfaces of the dashboard. Polished surfaces are
reflective and could interfere with
your driving view.
Seats
Wipe spills and chemical residues from interior surfaces as soon as possible using a soft cloth moistened with warm water and non-detergent soap. Wipe gently in a circular motion. Then wipe dry using a soft, lint-free cloth.
Although seating surfaces are designed to repel stains, Tesla recommends regular cleaning to maintain
performance and an as-new appearance. Promptly treat
dye transfer from clothing, such as indigo-dyed denim.
Avoid contact with harsh chemicals, including certain cosmetics. Never use cleaners containing alcohol or bleach. Spot-test cleaners on an inconspicuous area
before applying to visible surfaces.
If equipped with leather seats, note that leather is prone to dye-transfer which can cause discoloration, particularly on light colored leather. White and tan
leather is coated with an anti-soiling treatment. Using detergents or commercially available leather cleaners and conditioners is not recommended because they can discolor or dry out the leather.
Vacuum cloth seats as needed to remove any loose dirt.
CAUTION: Aftermarket, non-Tesla seat covers may
inhibit the sensitivity of a seat