lock CHEVROLET ASTRO 2003 Service Manual

Security Light Service All-Wheel
This light will come on
briefly when you turn the
ignition key to
START.
SERVICE
AWD
Drive Light
This light should come on
briefly when you turn on
the ignition, as a check to
show you it is working.
The light will stay on until the engine starts.
If the light The SERVICE AWD light
comes on to indicate that
flashes, the Passlock@ System has entered a tamper there
may be a problem with the drive system and
mode. If the vehicle fails to start, see
Passlock@ service is required. Malfunctions can be indicated by the
on page 2- 18. system before any problem is apparent, which may
If the light comes on continuously while driving and also designed to assist your service technician in
stays on, there may be a problem with the Passlock@ correctly diagnosing a malfunction.
System. Your vehicle will not be protected by Passlock@,
and you should see your
GM dealer. prevent serious
damage to the vehicle. This system is
3-35

Audio System(s)
Notice; Before you add any sound equipment to
your vehicle
- like a tape player, CB radio, mobile
telephone or two-way radio
- be sure you can add
what you want. If you can, it’s very important to do
it
properly. Added sound equipment may interfere
with the operation of your vehicle’s engine, Delphi Electronics radio or other systems, and even damage
them. Your vehicle’s systems may interfere with the
operation
of sound equipment that has been added
improperly.
So, before adding sound equipment, check with
your dealer and be sure to check federal rules
covering mobile radio and telephone units.
Your audio system has been designed to operate easily
and to give years of listening pleasure. You will get the
most enjoyment out of it
if you acquaint yourself with it
first. Find out what your audio system can do and how to
operate all of its controls to be sure you’re getting the
most out of the advanced engineering that went into it.
Your vehicle may have a feature called Retained
Accessory Power (RAP). With RAP, you can play
your audio system even after the ignition is turned
off.
See “Retained Accessory Power (RAP)” under
Ignition Positions on page 2- 79.
Setting the Time for Radios with
the Set Button
Press SET. Within five seconds, press and hold the
right SEEK arrow until the correct minute appears on the
display. Press and hold the left SEEK arrow until the
correct hour appears on the display.
Setting the Time for Radios with
HR and MN Buttons
Press and hold HR until the correct hour appears on the
display. Press and hold
MN until the correct minute
appears on the display.
To display the time with the
ignition
off, press RECALL or HR/MN and the time will
be displayed for a few seconds. There is an initial
two-second delay before the clock goes into the
time-set mode.
3-38

Radio with CD
Playing the Radio
PWR (Power): Press this knob to turn the system
on and
off.
VOL (Volume): Turn this knob to increase or to
decrease volume. The knob is capable of rotating
continuously.
SCV (Speed-Compensated Volume): With SCV,
your audio system adjusts automatically to make up
for road and wind noise as you drive.
Set the volume at the desired level. Turn the control
ring behind the upper knob clockwise to increase
the SCV. Each notch on the control ring allows for
more volume compensation at faster vehicle speeds.
Then, as you drive, SCV automatically increases
the volume, as necessary, to overcome noise at any
speed. The volume level should always sound the same
to you as you drive.
If you don’t want to use SCV,
turn the control all the way down.
RECALL: Press this button to switch the display
between the radio station frequency and the time.
Time display is available with the ignition turned
off.
Finding a Station
AM FM: Press this button to switch between AM, FM1
and FM2. The display will show your selection.
TUNE: Press this knob lightly so it extends. Turn it to
choose radio stations. Push the knob back into its stored
position when you’re not using it.
3-41

While listening to a CD, press the up arrow to hear the
next track on the CD. Press the down arrow to go
back to the start of the current track
if more than eight
seconds have played. The SEEK button is inactive
if the
CD mode on the front radio is in use.
To scan preset stations, press and hold SEEK until the
radio goes into scan mode. The radio will go to a station,
play for a few seconds, then go on to the next station.
Press either SEEK arrow again to stop scanning. The
scan function is inactive
if the front radio is in use.
P.SET PROG (Preset Program): The front passengers
must be listening to something different for each of
these functions to work:
Press this button to scan through the preset radio
stations set on the pushbuttons on the main radio.
The radio will go to
a preset station, play for a
few seconds, then go on to the next preset station.
Press this button again to stop scanning.
TAPE CD: Press this button to switch between playing
a tape or CD
if loaded. The inactive tape or CD will
remain safely inside the radio for future listening.
Theft-Deterrent Feature
THEFTLOCK@ is designed to discourage theft of your
radio. It works by using a secret code to disable all radio
functions whenever battery power is interrupted.
The THEFTLOCK@ feature for the radio may be used or
ignored.
If ignored, the system plays normally and the
radio is not protected by the feature.
If THEFTLOCK@ is
activated, your radio will not operate
if stolen.
When THEFTLOCK@ is activated, the radio will display
LOC to indicate a locked condition anytime battery
power has been interrupted.
If your battery loses power
for any reason, you must unlock the radio with the
secret code before
it will operate.
3-47

Activating the Theft-Deterrent Feature
The instructions which follow explain how to enter your
secret code to activate the THEFTLOCK@ system. Read
through all nine steps before starting the procedure.
If you allow more than 15 seconds to elapse between
any steps, the radio automatically reverts to time
and you must start the procedure over at Step
4.
1. Write down any three or four-digit number from
000 to 1999 and keep it in a safe place separate
from the vehicle.
2. Turn the ignition on.
3. Turn the radio off.
4. Press the 1 and 4 pushbuttons at the same time.
Hold them down until - - - shows on the display.
Next you will use the secret code number which you
have written down.
5. Press MN and 000 will appear on the display.
6. Press MN again to make the last two digits agree
with your code.
7. Press HR to make the first one or two digits agree
with your code.
8. Press AM FM after you have confirmed that the
code matches the secret code you have written
down. The display will show REP to let you know
that you need to repeat Steps 5 through
7 to confirm
your secret code.
9. Press AM FM and this time the display will show
SEC to let you know that your radio is secure.
The
LED indicator by the volume knob will begin
flashing when the ignition is turned
off.
3-48

Unlocking the Theft-Deterrent Feature
After
a Power Loss
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition on. LOC will appear on the display.
2, Press MN and 000 will appear on the display.
3. Press MN again to make the last two digits agree
with your code.
4. Press HR to make the first one or two digits agree
with your code.
5. Press AM FM after you have confirmed that the
code matches the secret code you have written
down. The display will show SEC, indicating
the radio is now operable and secure.
If you enter the wrong code eight times, INOP will
appear on the display. You will have to wait an hour
with the ignition on before you can try again. When you
try again, you will only have three chances to enter
the correct code before INOP appears.
If you lose or forget your code, contact your dealership.
Disabling the Theft-Deterrent Feature
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition on.
2. Turn the radio off.
3. Press the 1 and 4 pushbuttons at the same time.
Hold them down until SEC shows on the display.
4. Press MN and
000 will appear on the display.
5. Press MN again to make the last two digits agree
with your code.
6. Press HR to make the first one or two digits agree
with your code.
7. Press AM FM after you have confirmed that the
code matches the secret code you have written
down. The display will show
- - -, indicating that the
radio is no longer secured.
If the code entered is incorrect, SEC will appear on the
display. The radio will remain secured until the correct
code is entered.
When battery power is removed and later applied to a
secured radio, the radio won’t turn on and LOC will
appear on the display.
To unlock a secured radio, see Unlocking the
Theft-Deterrent Feature After
a Power Loss earlier
in this section.
3-49

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’re driving, brake
normally but don’t 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
Your vehicle has anti-lock brakes. ABS is an advanced
electronic braking system that will help prevent a
braking skid.
When you start your engine and begin to drive away,
your anti-lock brake system will check itself. You may hear a momentary motor or clicking noise while this test
is going on. This is normal.
ANTI -
LOCK
I I I I
United States Canada
If there’s a problem with the anti-lock brake system, this
warning light will stay on. See
Anti-Lock Brake System
Warning Light on page
3-29.
4-7

Let’s say the road is wet and you’re driving safely.
Suddenly, an animal jumps out in front of you.
You slam on the brakes and continue braking.
Here’s 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 front wheel
and at both rear wheels. 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.
4-8

Remember: Anti-lock doesn’t change the time you need
to get your foot up to the brake pedal or always
decrease stopping distance. If you get too close to the
vehicle in front of you, you won’t have time to apply
your brakes
if that vehicle suddenly slows or stops.
Always leave enough room up ahead to stop, even
though you have anti-lock brakes.
Using Anti-Lock
Don’t pump the brakes. Just hold the brake pedal down
firmly and let anti-lock work for you. You may feel
the brakes vibrate, or you may notice some noise, but
this is normal.
Braking in Emergencies
With anti-lock, you can steer and brake at the same
time. In many emergencies, steering can help you more
than even the very best braking.
Power Steering
If you lose power steering assist because the engine
stops or the system is not functioning, you can steer but
it will take much more effort.
Steering Tips
Driving on Curves
It’s important to take curves at a reasonable speed.
A lot of the “driver lost control” accidents mentioned on
the news happen on curves. Here’s why:
Experienced driver or beginner, each of us is subject
to the same laws of physics when driving on curves.
The traction of the tires against the road surface makes
it possible for the vehicle to change its path when
you turn the front wheels. If there’s no traction, inertia
will keep the vehicle going in the same direction.
If you’ve ever tried to steer a vehicle on wet ice,
you’ll understand this.
The traction you can get in a curve depends on the
condition of your tires and the road surface, the angle at
which the curve is banked, and your speed. While you’re
in a curve, speed is the one factor you can control.
4-9

An emergency like this requires close attention and a
quick decision. If you are holding the steering wheel at
the recommended
9 and 3 o’clock positions, you
can turn it a full
180 degrees very quickly without
removing either hand. But you have
to act fast, steer
quickly, and just as quickly straighten the wheel
once you have avoided the object.
The fact that such emergency situations are always
possible is a good reason to practice defensive driving
at all times and wear safety belts properly.
Off -Road Recovery
You may find that your right wheels have dropped off the
edge of a road onto the shoulder while you’re driving.
If the level of the shoulder is only slightly below the
pavement, recovery should be fairly easy. Ease
off the
accelerator and then,
if there is nothing in the way,
steer
so that your vehicle straddles the edge of
the pavement. You can turn the steering wheel up to
one-quarter turn until the right front tire contacts the
pavement edge. Then turn your steering wheel to
go straight down the roadway.
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