2004 CHEVROLET OPTRA ABS

Braking
Braking action involvesperception timeand
reaction time.
First, you have to decide to push on the brake pedal.
That isperception time.Then you have to bring up your
foot and do it. That isreaction time.
Averagereaction timeis about 3/4 of a second. But that is
only an average. It might be less with one driver and as
long as two or three seconds or more with another. Age,
physical condition, alertness, coordination and eyesight
all play a part. So do alcohol, drugs and frustration. But
even in 3/4 of a second, a vehicle moving at 60 mph
(100 km/h) travels 66 feet (20 m). That could be a lot of
distance in an emergency, so keeping enough space
between your vehicle and others is important.
And, of course, actual stopping distances vary greatly
with the surface of the road (whether it is pavement
or gravel); the condition of the road (wet, dry, icy); tire
tread; the condition of your brakes; the weight of
the vehicle and the amount of brake force applied.
Avoid needless heavy braking. Some people drive
in spurts−heavy acceleration followed by heavy
braking — rather than keeping pace with traffic. This
is a mistake.Your brakes may not have time to cool between hard
stops. Your brakes will wear out much faster if you do a
lot of heavy braking. If you keep pace with the traffic
and allow realistic following distances, you will eliminate
a lot of unnecessary braking. That means better
braking and longer brake life.
If your engine ever stops while you are driving, brake
normally but do not pump your brakes. If you do,
the pedal may get harder to push down. If your engine
stops, you will still have some power brake assist.
But you will use it when you brake. Once the power
assist is used up, it may take longer to stop and
the brake pedal will be harder to push.
Anti-lock Brake System (ABS)
Your vehicle may have anti-lock brakes. ABS is an
advanced electronic braking system that will help
prevent a braking skid.
If your vehicle has anti-lock
brakes, this warning light
on the instrument panel will
come on briefly when
you start your vehicle.
4-6

Let us say the road is wet and you are driving safely.
Suddenly, an animal jumps out in front of you. You slam
on the brakes and continue braking. Here is what
happens with ABS:
A computer senses that wheels are slowing down. If
one of the wheels is about to stop rolling, the computer
will separately work the brakes at each wheel.The anti-lock system can change the brake pressure
faster than any driver could. The computer is
programmed to make the most of available tire and road
conditions. This can help you steer around the obstacle
while braking hard.
As you brake, your computer keeps receiving updates on
wheel speed and controls braking pressure accordingly.
4-7

Fuses and Circuit Breakers
The wiring circuits in your vehicle are protected from
short circuits by a combination of fuses, circuit breakers
and fusible thermal links in the wiring itself.
Look at the silver-colored band inside the fuse. If the
band is broken or melted, replace the fuse. Be sure you
replace a bad fuse with a new one of the identical
size and rating.
There are spare fuses provided in the engine
compartment fuse block. If you ever have a problem on
the road and do not have a spare fuse, you can borrow
one that has the same amperage. Just pick a feature of
your vehicle that you can get along without — like the
radio or cigarette lighter — and use its fuse, if it is the
correct amperage. Replace it as soon as you can.
There are two fuse blocks in your vehicle: the instrument
panel fuse block and the engine compartment fuse block.
There is a fuse puller located on the engine
compartment fuse block. It can be used to easily
remove fuses from the fuse block.
Instrument Panel Fuse Block
The instrument panel fuse block is located on the end of
the instrument panel, on the driver’s side of the
vehicle. To access the fuses, open the fuse panel door
by pulling out.
To reinstall the door, insert the tabs at the back end
first, then push the door into the instrument panel
to secure it.Sedan shown, Hatchback similar
5-83

Fuses Usage
AIR BAG Air Bag
WPR Wiper
RADIO/CLK Radio/Clock
ECM Engine Control Module
BLANK Not Used
AUX LTR Extra Jack
TRN SIG
LAMPSTurn Signal Lamps
ABS, CRUISEAnti-lock Brake System, Cruise
Control System
LTR Cigarette Lighter
CLSTRCluster, Brake Transmission Shift
Interlock/Automatic Transaxle Shift
Lock (BTSI) Solenoid
BLANK Not Used
BCK/UP Back-upFuses Usage
BLANK Not Used
TCM Transmission Control Module
CRUISE
SWITCHCruise Switch (Contact Coil)
ENG FUSE
BOX, DRLEngine Fuse Box, Daytime Running
Lamps
HAZRD LAMPS Hazard Lamps
AUTO A/C A/C Switch, Clock
HVACHeating, Ventilation and Air
Conditioning
RKE Remote Keyless Entry
RADIO Radio
S/ROOF Sunroof
DLC Data Link Connector
BLANK Not Used
5-85

Fuses Usage
HEAD LAMPS Headlamps
ECM Engine Control Module
IGN COIL Ignition Coil
I/P FUSE Instrument Panel Fuse
FUEL PUMP Fuel Pump
A/C Air Conditioning
HORN Horn
HI BEAM Headlamp High-Beam
DRIVER’S
PWR WNDWDriver’s Power Window
STOP LAMPS Stoplamps
DR/LCK Door Lock
MIR HTD Heated Mirror
FRT FOG Front Fog
ILLUM LTLicense Plate Lamp, Parking
Lamp Left
INJ Injector
ENG SNSREvaporative Emission (EVAP)
Canister Purge Solenoid, Heated
Oxygen Sensor (HO2S), Cooling Fan
Relay, CMP SensorFuses Usage
LOW BEAM LT Headlamp Low-Beam Left
ILLUM RTIllumination Circuit, Parking Lamp
Right
LOW BEAM RT Headlamp Low-Beam Right
SPARE Spare
SPARE Spare
SPARE Spare
BATT PWR Battery Power
ABS Anti-lock Brake System
HVAC BLWR HVAC Blower
IGN 2 Ignition 2
IGN 1 Ignition 1
FUSE PLR Fuse Puller
COOL FAN
LOWCooling Fan Low
DEFOG Defog
COOL FAN HI Cooling Fan High
PWR WNDW Power Window
5-88

A
Accessory Power Outlets.................................3-16
Adding Washer Fluid.......................................5-34
Additional Program Information........................... 7-9
Additives, Fuel................................................. 5-6
Add-On Electrical Equipment............................5-82
Adjusting the Speakers (Balance/Fade)......3-42, 3-46
Air Bag
Readiness Light..........................................3-28
Air Bag Systems.............................................1-51
How Does an Air Bag Restrain?....................1-57
Servicing Your Air Bag-Equipped Vehicle.........1-60
What Makes an Air Bag Inflate?....................1-57
What Will You See After an Air Bag Inflates?......1-58
When Should an Air Bag Inflate?...................1-56
Where Are the Air Bags?..............................1-54
Air Cleaner/Filter, Engine.................................5-18
Airbag Sensing and Diagnostic Module (SDM).......7-10
AM ...............................................................3-51
Antenna, Backglass.........................................3-52
Anti-lock Brake System (ABS)............................ 4-6
Anti-Lock Brake, System Warning Light..............3-31
Appearance Care............................................5-73
Care of Safety Belts....................................5-76
Chemical Paint Spotting...............................5-79
Cleaning the Inside of Your Vehicle................5-73
Cleaning the Outside of Your Vehicle..............5-76
Finish Damage............................................5-78Appearance Care (cont.)
Sheet Metal Damage...................................5-78
Underbody Maintenance...............................5-79
Vehicle Care/Appearance Materials................5-79
Weatherstrips..............................................5-76
Arming the System.........................................2-16
Ashtrays........................................................3-17
Audio System(s).............................................3-40
Backglass Antenna......................................3-52
Care of Your CD Player...............................3-52
Care of Your CDs........................................3-52
Radio with CD....................................3-40, 3-44
Theft-Deterrent Feature................................3-51
Understanding Radio Reception.....................3-51
Automatic Transaxle........................................2-19
Fluid..........................................................5-20
Operation...................................................2-23
Automatic Transaxle Check..............................6-19
Automatic Transaxle Shift Lock Control
System Check.............................................6-21
B
Backglass Antenna..........................................3-52
Battery..........................................................5-38
Battery Replacement......................................... 2-6
Before Leaving on a Long Trip.........................4-22
Body Lubrication Service..................................6-20
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