2004 Acura TL sensor

Your Airbag System includes:Two SRS (Supplemental Restraint
System) f ront airbags. The driver’s
airbag is stored in the center of
the steering wheel; the f ront
passenger’sairbagisstoredinthe
dashboard. Both are marked ‘‘SRS
AIRBAG.’’
Two side airbags, one f or the
driver and one f or a f ront
passenger. The airbags are stored
in the outer edges of the seat-
backs. Both are marked ‘‘Side
Airbag’’ (see page ). Two side curtain airbags, one f or
each side of the vehicle. The
airbags are stored in the f ront,
center, and rear pillars. The f ront
and center pillars on both sides are
marked ‘‘SIDE CURTAIN
AIRBAG’’ (see page ).
Automatic front seat belt
tensioners (see page ).
An indicator on the instrument
panel that alerts you to a possible
problem with your airbags (see
page ).
Emergency backup power in case
your vehicle’s electrical system is
disconnected in a crash.
Sensors that can detect a
moderate to severe front impact or
side impact.
A sophisticated electronic system
that continually monitors and
records inf ormation about the
sensors, the control unit, the
airbag activators, and driver and
frontpassengerseatbeltusewhen
the ignition is in the ON (II)
position.
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26 20
A irbag System Components
Additional Inf ormation About Your Airbags
Driver and Passenger Saf ety22

If you ever have a moderate to
severe f rontal collision, sensors will
detect the vehicle’s rapid
deceleration. If the rate of
deceleration is high enough, the
control unit will instantly inf late
driver’s and f ront passenger’s f ront
airbags.During a f rontal crash, your seat belt
restrains your lower body and torso,
and the f ront airbag helps protect
your head and chest.
Af ter inf lating, the f ront airbags
immediately def late, so they won’t
interf ere with the driver’s visibility,
or the ability to steer or operate
other controls.
Although both airbags normally
inf late within split second of each
other, it is possible f or only one
airbag to deploy.
This can happen if the severity of a
collision is at the margin, or
threshold, that determines whether
or not the airbags will deploy. In
such cases, the seat belt will provide
suf f icient protection, and the
supplemental protection of f ered by
the airbag would be minimal.
CONT INUED
Additional Inf ormation About Your Airbags
How Your Front Airbags Work
Driver and Passenger Saf ety23

If you ever have a moderate to
severe side impact, the sensors will
detect rapid deceleration and signal
the control unit to instantly inf late
either the driver’s or the passenger’s
side airbag.To get the best protection f rom the
side airbags, front seat occupants
should wear their seat belts and sit
upright and well back in their seats.
The passenger’s side airbag has a
cutof f system designed to turn of f
the passenger’s side airbag if a child’s
head is in the airbag’s deployment
path (see page ).
A f ront seat passenger should not
use a cushion or other object as a
backrest. It may prevent the cutof f
system f rom working properly.If a short adult leans sideways, or a
larger adult slouches and leans
sideways into the side airbag
deployment path, the system may
also shut off the side airbag.
If the side airbag of f indicator comes
on, have the passenger sit upright.
Once the passenger is out of the
deployment path of the side airbag,
the system will turn the airbag back
on, and the indicator will go out.
Only one airbag will deploy during a
side impact. If the impact is on the
passenger’s side, the passenger’s
side airbag will deploy even if there
is no passenger. 27
How Your Side A irbags Work
Driver and Passenger Saf ety
Additional Inf ormation About Your Airbags
25

In a moderate to severe side impact,
sensors will detect rapid deceleration
and signal the control unit to
instantly inflate the side curtain
airbag on the driver’s or the
passenger’s side of the vehicle. If the
impact is on the passenger’s side, the
passenger’s side curtain airbag will
inflate even if there are no occupants
on that side of the vehicle.
To get the best protection f rom the
side curtain airbags, occupants
should wear their seat belts and sit
upright and well back in their seats.The SRS indicator alerts
you to a potential problem
with your airbags or seat belt
tensioners.
When you turn the ignition switch to
ON (II), this indicator will come on
brief ly then go out. This tells you
that the system is working properly.
If the indicator comes on at any
other time, or does not come on at all,
you should have the system checked
by your dealer. For example:
If the SRS indicator does not come
on after you turn the ignition to
ON (II).
If the indicator stays on after the
engine starts.
Your vehicle is equipped with side
curtain airbags. These airbags are
stored in the f ront, center, and rear
pillars on both sides. The f ront and
rear pillars on both sides are marked
‘‘SIDE CURTAIN AIRBAG.’’
Additional Inf ormation About Your Airbags
How Your Side Curtain A irbags
Work
How the SRS Indicator Works
Driver and Passenger Saf ety26
SIDE CURTAIN AIRBAG

To reset a trip meter, display it, then
press and hold the Select/Reset
button until the number resets to
‘‘0.0’’.
Both trip meters will reset if the
vehicle’s battery goes dead or is
disconnected.This shows the outside Fahrenheit
temperature in U.S. models, and
Centigrade temperature in Canadian
models.
In certain weather conditions,
temperature readings near f reezing
(32°F, 0°C) could mean that ice is
f orming on the road surf ace. The temperature sensor is in the
f ront bumper. The temperature
reading can be affected by heat
ref lection f rom the road surf ace,
engine heat, and the exhaust f rom
surrounding traf f ic. This can cause
an incorrect temperature reading
when your speed is under
19 mph (30 km/h). When you start
your trip, the sensor is not f ully
acclimatized, theref ore it may take
several minutes until the proper
temperature is displayed.
Multi-Inf ormation Display
Inst rument s and Cont rols
Outside Temperature
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SELECT/
RESET
BUTTON

Both f ront seats are equipped with
seat heaters. The ignition switch
must be in the ON (II) position to
usethem.PushtheHIsideof the
switch to rapidly heat up the seat.
After the seat reaches a comfortable
temperature, push the LO side of the
switch. This will keep the seat warm.The HI or LO indicator stays on until
youturnitoff bypushingthe
opposite side of the switch lightly.
In HI, the heater turns of f when the
seat gets warm, and turns back on
after the seat’s temperature drops. It
continues to cycle as long as you
leave it set on HI. The HI indicator
stays on as a reminder that you have
the heater on.
In LO, the heater runs continuously.
It does not cycle with temperature
changes.
Follow these precautions whenever
you use the seat heaters:
Use the HI setting only to heat the
seats quickly. Select the LO
setting when the seats f eel warm.
The HI setting draws large
amounts of current f rom the
battery.
Do not use the seat heaters, even
on the LO setting, if the engine is
lef t idling f or an extended period.
Thiscanweakenthebattery,
causing hard starting.
Because of the sensors f or the side
airbag system, there is no heater in
the passenger’s seat-back.
Seat Heaters
Inst rument s and Cont rols96
SEAT HEATERS

Theclimatecontrolsystemhastwo
sensors. A sunlight sensor is in the
top of the dashboard, and a
temperature sensor is next to the
steering column. Do not cover the
sensors or spill any liquid on them.
Climat e Cont rol
Comf ort and Convenience Feat ures
Sunlight and T emperature
Sensors
116
SUNLIGHT SENSORTEMPERATURE SENSOR

The exhaust emissions controls
include f our systems: PGM-FI,
Ignition Timing Control, Exhaust
Gas Recirculation and Three Way
Catalytic Converter. These four
systems work together to control the
engine’s combustion and minimize
the amount of HC, CO, and NOx that
comes out the tailpipe. The exhaust
emissions control systems are
separate f rom the crankcase and
evaporative emissions control
systems.
The PGM-FI System uses sequential
multiport f uel injection.
It has three subsystems: Air Intake,
Engine Control, and Fuel Control.
The Powertrain Control Module
(PCM) uses various sensors to
determine how much air is going
into the engine. It then controls how
much f uel to inject under all
operating conditions.This system constantly adjusts the
ignition timing, reducing the amount
of HC, CO, and NOx produced.
The Exhaust Gas Recirculation
(EGR) system takes some of the
exhaust gas and routes it back into
the intake manif old. Adding exhaust
gas to the air/f uel mixture reduces
the amount of NOx produced when
the f uel is burned.
The three way catalytic converter is
in the exhaust system. Through
chemical reactions, it converts HC,
CO, and NOx in the engine’s exhaust
to carbon dioxide (CO ), nitrogen
(N ), and water vapor.
The emissions control systems are
designed and certif ied to work
together in reducing emissions to
levels that comply with the Clean Air
Act. To make sure the emissions
remain low, you should use only new
Acura replacement parts or their
equivalent f or repairs. Using lower
qualitypartsmayincreasethe
emissions f rom your vehicle.
The emissions control systems are
covered by warranties separate from
the rest of your vehicle. Read your
warranty manual f or more informa-
tion.
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2
Emissions Cont rols
T echnical Inf ormation
Exhaust Emissions Controls Replacement Parts
PGM-FI Syst emIgnit ion T iming Cont rol Syst em
Exhaust Gas Recirculat ion (EGR)Syst em
Three Way Catalytic Converter
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