1997 CHEVROLET EXPRESS ECU

Downloaded from www.Manualslib.com manuals search engine Activating the Theft-Deterrent Feature
The instructions which follow, explain how to enter your
secret code to activate the THEFTLOCK system. It is
recommended that you read through all nine steps
before starting the procedure.
NOTE:
If you allow more than 15 sec.onds to elapse
between any steps, the radio automatically reverts to
time and you must start the procedure over at Step
4.
1.
2.
3.
4.
5.
6.
7.
Write down any three or four-digit number from
000 to 1999 and keep it in a safe place separate
from the vehicle.
Turn the ignition to ACCESSORY or
RUN.
Turn the radio off.
Press the
1 and 4 buttons together. Hold them down
until
--- shows on the display. Next you will use the
secret code number which you have written down.
Press MN and
000 will appear on the display.
Press MN again
to make the last two digits agree
with your code.
Press
HR to make the first one or two digits agree
with your code.
8.
9. 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.
Press AM-FM and this time the display will show
SEC to let you know that your radio is secure. The
indicator by the volume control will begin flashing
when the ignition is turned off.
Unlocking the Theft-Deterrent Feature After a
Power
Loss
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. LOC appears when the ignition is on.
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.
code matches
the secret code you have written down.
The display will show SEC, indicating the radio
is
now operable and secure.
5. Press AM-FM after you have confirmed that the

Downloaded from www.Manualslib.com manuals search engine 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 dealer.
Disabling the Theft-Deterrent Feature
Enter your secret code as follows; pause no more than
15 seconds between steps:
1. Turn the ignition to ACCESSORY or RUN.
2. Turn the radio off.
3. Press the 1 and 4 buttons together. Hold them down
4. Press MN and 000 will appear on the display.
until
SEC shows on the display.
5. Press MN again to make the last two digits agree
with your code.
with your code.
6. Press HR to make the first one or two digits agree
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.
Understanding Radio Reception
FM Stereo
FM stereo will give you the best sound. But FM signals
will reach only about
10 to 40 miles (16 to 65 km). Tall
buildings or hills can interfere with
FM signals, causing
the sound
to come and go.
AM
The range for most AM stations is greater than for FM,
especially at night. The longer range, however, can
cause stations to interfere with each other. AM can pick
up noise from things like storms and power lines. Try
reducing
the treble to reduce this noise if you ever get it.
3-25

Downloaded from www.Manualslib.com manuals search engine Winter Dri-ving
Here are some tips for winter driving:
0 Have your vehicle in good shape for winter.
0 You may want to put winter emergency supplies in
Include an ice scraper, a small brush or broom,
a supply
of windshield washer fluid, a rag, some winter outer
clothing, a small shovel, a flashlight, a red cloth and
reflective warning triangles. And, if you will be driving
under severe conditions, .include a small bag of sand, a
piece of old carpet or a couple of burlap bags to help
provide traction. Be sure you properly secure these
items in your vehicle. your vehicle.
Driving on Snow or Ice
Most
of the time, those places where your tires meet the
road probably have good traction.
However, if there is snow or ice between your tires and
the road, you can have a very slippery situation. You’ll
have a lot less traction or “grip” and will need to be
very careful.
- ......... ........ ......... ........ ......... ........ ......... ........ ......... ........ ......... ........ ..... 1 11.1u1
V’
What’s the worst time for this? “Wet ice.” Very cold
snow or ice can be slick and hard to drive on. But wet
ice can be even more trouble because it may offer the
least traction of all. You can get wet ice when it’s about
freezing
(32°F; OOC) and freezing rain begins to fall.
Try to avoid driving on wet ice until salt and sand crews
can get there.
4-24

Downloaded from www.Manualslib.com manuals search engine The Certificatioflire label also tells you the maximum
weights for the front and rear axles, called Gross Axle
Weight Rating (GAWR).
To find out the actual loads on
your front and rear axles, you need to go
to a weigh
station and weigh your vehicle. Your dealer can help
you with this. Be sure to spread out your load equally
on
both sides of the centerline.
Never exceed the GVWR for your vehicle, or the
GAWR for either the front or rear axle.
And, if you do have a heavy load, you should spread
it out.
Do not load your vehicle any heavier than the
GVWR, or either the maximum front or rear
GAWR.
If you do, parts on your vehicle can
break, or it can change the
way your vehicle
handles. These could cause you to lose control.
Also, overloading can shorten the life of
your vehicle.
-
C *.UTION:
Things you put inside your vehicle can strike
and injure people in
a sudden stop or turn, or
in
a crash.
0 Put things in the cargo area of your vehicle.
Never stack heavier things, like suitcases,
Try to spread the weight evenly.
inside the vehicle
so that some of them are
above the tops of the seats.
0 Don’t leave an unsecured child restraint in
your vehicle.
When you carry something inside the
vehicle, secure
it whenever you can.
Don’t leave a seat folded down unless you
need to.
4-28

Downloaded from www.Manualslib.com manuals search engine Towing a trailer requires a certain amount of experience.
Before setting out for the open road, you’ll want
to get
to know your rig. Acquaint yourself with the feel of
handling and braking with
the added weight of the
trailer. And always keep in mind that the vehicle
you are
driving is now a good deal longer and not nearly as
responsive as your vehicle is by itself.
Before
you start, check the trailer hitch and platform
(and attachments), safety chains, electrical connector,
lamps, tires and mirror adjustment. If
the trailer has
electric brakes, start your vehicle and trailer moving and
then apply the trailer brake controller by hand to be sure
the brakes are working. This lets you check your
electrical connection at the same time.
During your trip, check occasionally
to be sure that the
load is secure, and that the lamps and any trailer brakes
are still working.
Following Distance
Stay at least twice as far behind the vehicle ahead as you
would when driving your vehicle without a trailer. This
can help you avoid situations
that require heavy braking
and sudden turns.
Passing
You’ll need more passing distance up ahead when
you’re towing a trailer. And, because you’re a good deal
longer, you’ll need
to go much farther beyond the
passed vehicle before you can return to your lane.
Backing Up
Hold the bottom of the steering wheel with one hand.
Then,
to move the trailer to the left, just move that hand
to the left.
To move the trailer to the right, move your
hand to the right. Always back up slowly and, if
possible, have someone guide you.
4-35

Downloaded from www.Manualslib.com manuals search engine Trailer Wiring Harness
The light-duty trailer wiring harness is a six-wire
harness assembly. The optional heavy-duty trailer
wiring package is an eight-wire harness assembly. The
harness is stored under the vehicle, along the driver’s
side rear corner of the frame rail.
The heavy-duty trailer
wiring harness has a 30-amp feed wire. Both harnesses
come without connectors and should be wired by a
qualified electrical technician. The technician can use
the following color code chart when connecting the
wiring harness to your trailer.
0
0
0
0
0
0
0
0
Dark Blue: Use for electric trailer brakes (eight-wire
harness only)
Orange: Trailer accessory (eight-wire harness only)
Light Green: Back-up lamps
Brown: Parking lamps
Yellow: Left stoplamp and turn signal
Dark Green: Right stoplamp and turn signal
White (heavy gage): Ground wire
White (light gage): Center high-mounted stoplamp
Securely attach the harness to the trailer, then tape or
strap it
to your vehicle’s frame rail. Be sure you leave it
loose enough
so the wiring doesn’t bend or break, but
not
so loose that it drags on the ground. Store the
harness in its original place. Wrap
the harness together
and
tie it neatly so it won’t be damaged.

Downloaded from www.Manualslib.com manuals search engine I I
’ A CAUTIO--:
- - -
To help avoid injury to you or others:
0
0
0
0
0
Never let passengers ride in a vehicle that is
being towed.
Never tow faster than safe or posted speeds.
Never tow with damaged parts not
fully secured. Never get under your vehicle after it has
been lifted by the tow truck.
Always use separate safety chains on each
side when towing a vehicle.
When your vehicle is being towed, have the ignition
key
off. The steering wheel should be clamped in a
straight-ahead position, with a clamping device
I designed for towing service. Do not use the vehicle’s
steering column lock for this. The transmission should
be
in NEUTRAL (N) and the parking brake should
be released.
A
,!1 CAUTION:
A vehicle can fall from a car carrier if it isn’t
adequately secured. This can cause a collision,
serious personal injury and vehicle damage.
The vehicle should be tightly secured with
chains or steel cables before it is transported.
Don’t use substitutes (ropes, leather straps,
canvas webbing, etc.) that can be cut by sharp
edges underneath the towed vehicle.

Downloaded from www.Manualslib.com manuals search engine If you have a vehicle which was completed from a cab
and chassis, refer to the information from
the body
supplierhstaller.
The spare
tire is a full size tire, like the other tires on
your vehicle.
For cargo vans, and
all passenger vans except
those with the
15 passenger
seating arrangement, the
jack is secured in the rear
passenger side corner
of
the vehicle.
Remove the retaining wing bolt and
lift it off the
mounting bracket. Set the jack and jacking equipment
near the flat tire. For vans
with the 15 passenger
seating arrangement,
the jack is secured
on the rear passenger side floor of
the vehicle.
Remove
the retaining wing bolt and lift it out of the
mounting bracket. Set the jack and jacking equipment
near the flat tire.