GMC YUKON DENALI 2003 Owners Manual

The remote negative (-)
terminal is located on
the engine accessory
drive bracket and
is
marked GND.
See Engine Compartment Overview on page 5-12
for more information on location. Using a match
near
a battery can cause battery
gas to explode. People have been hurt doing
this, and some have been blinded. Use a
flashlight
if you need more light.
Be sure the battery has enough water. You
don’t need to add water to the ACDelco@
battery installed in your new vehicle. But
if a
battery has filler caps, be sure the right
amount of fluid is there.
If it is low, add water
to take care of that first. If you don’t, explosive
gas could be present.
Battery fluid contains acid that can burn you.
Don’t get
it on you. If you accidentally get it in
your eyes or on your skin, flush the place with
water and get medical help immediately.
J
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5. Check that the jumper cables don’t have loose or
missing insulation. If they do, you could get a
shock. The vehicles could be damaged too.
Before you connect the cables, here are some
basic things you should know. Positive
(+) will go to
positive (+) or to a remote positive terminal (+) if
the vehicle has one. Negative (-) will go to a heavy,
unpainted metal engine part or
to a remote
negative
(-) terminal, if the vehicle has one.
Don’t connect positive
(+) to negative (-) or you’ll
get a short that would damage the battery and
maybe other parts
too.
Fans or other moving engine parts can injure
you badly. Keep your hands away from moving
parts once the engine is running.
6. Connect the red
positive
(+) cable to the
positive
(+) terminal of the
dead battery. Use a
remote positive
(+)
terminal if the vehicle
has one.
7. Don’t let the other end
touch metal. Connect it
to the positive
(+)
terminal of the good
battery. Use a remote positive
(+) terminal
if the vehicle has one
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8. Now connect the black
negative
(-) cable to the
negative
(-) terminal
of the good battery. Use
a remote negative
(-)
terminal if the vehicle has
one. Your vehicle’s
remote negative
(-)
terminal is marked GND.
Don’t let the other end touch anything until the next
step. The other end of the negative
(-) cable
doesn’t go to the dead battery.
It goes to a heavy,
unpainted metal engine part or
to a remote
negative
(-) terminal on the vehicle with the
dead battery.
9. Connect the other end of
the negative (-) cable at
least
18 inches (45 cm)
away from the dead
battery, but not near
engine parts that move.
The electrical connection is just as good there, and
the chance of sparks getting back
to the battery
is much less.
10. Now start the vehicle with the good battery and run
the engine for awhile.
11. Try to start the vehicle that had the dead battery. If
it won’t start after a few tries, it probably needs
service.
Notice: Damage to your vehicle may result from
electrical shorting if jumper cables are removed
incorrectly.
To prevent electrical shorting, take care
that the cables don’t touch each other or any
other metal. The repairs wouldn’t be covered by
your warranty.
5-44

A a
Jumper Cable Removal
A. Heavy, Unpainted Metal Engine Part or Remote
B. Good Battery or Remote Positive
(+) and
C. Dead Battery or Remote Positive (+) Terminal.
Negative
(-) Terminal.
Negative
(-) Terminals.
To disconnect the jumper cables from both vehicles do
the following:
1. Disconnect the black negative (-) cable from the
vehicle that had the dead battery.
2. Disconnect the black negative (-) cable from the
3. Disconnect the red positive (+) cable from the
4. Disconnect the red positive (+) cable from the other
5. Return the positive (+) remote terminal cover to its
vehicle
with the good battery.
vehicle with the good battery.
vehicle. original position.
5-45

All-Wheel Drive
Lubricant checks in this section also apply to these
vehicles. However, there are two additional systems that
need lubrication.
Transfer Case
When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often
to check the lubricant. See Part C: Periodic
Maintenance Inspections on page
6-14.
How to Check Lubricant
To get an accurate reading, the vehicle should be on a
level surface.
If the level is below the bottom of the filler plug hole,
you’ll need
to add some lubricant. Add enough lubricant
to raise the level to the bottom of the filler plug hole.
Use care not
to overtighten the plug.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant
to use. See Part D: Recommended
Fluids and Lubricants on page
6-15.
5-46

Front Axle To get an accurate reading, the vehicle should be on a
When to Check and Change Lubricant level surface.
If the level
is below the bottom of the filler plug hole,
Refer to the Maintenance Schedule to determine how
often to check the lubricant and when to change it. See you may need to add
some lubricant.
Part
A: Scheduled Maintenance Services on page 6-4. When the differential is cold, add enough lubricant to
raise the level to 1/2 inch (12 mm) below the filler
How to Check Lubricant plug hole.
When the differential is at operating temperature
(warm), add enough lubricant
to raise the level to the
bottom of the filler plug hole.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant
to use. See Part D: Recommended
Fluids and Lubricants on page
6-15.
5-47

Rear Axle
When to Check Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant. See Part
A: Scheduled
Maintenance Services
on page 6-4.
How to Check Lubricant
To get an accurate reading, the vehicle should be on a
level surface.
The proper level is from
5/8 inch to 1 5/8 inch (15 mm to
40 mm) below the bottom of the filler plug hole. Add
only enough fluid to reach the proper level.
What to Use
Refer to the Maintenance Schedule to determine what
kind
of lubricant to use. See Part D: Recommended
Fluids and Lubricants
on page 6-15.
5-48

Bulb Replacement
See Replacement Bulbs on page 5-53 for the proper
type
of bulbs to use.
For any bulb changing procedure not listed in this
section, contact your dealer.
Halogen Bulbs
Halogen bulbs have pressurized gas inside
and can burst if you drop or scratch the bulb.
You or others could be injured. Be sure to read
and
follow the instructions on the bulb
package.
Headlamps
1. Remove the two pins on the top of the headlamp
assembly.
To remove the pins, turn the outer pin
outward and pull
it straight up. To remove the inner
pin, turn it inward and pull it straight up.
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A. Low-Beam Headlamp
B. High-Beam Headlamp
1. Pull the headlamp assembly out.
2. Unplug the electrical connector.
3. Turn the bulb counterclockwise and remove it from
the headlamp assembly.
4. Put the new bulb into the headlamp assembly and
turn it clockwise until it is tight. Use care not to
touch the bulb with your fingers or hands.
5. Plug in the electrical connector.
6. Put the headlamp assembly back into the vehicle.
7. Install and turn the two pins into the locking feature.
A. Sidemarker Lamp
B. Retainer Clip
C. Front Turn Signal Lamp
D. Daytime Running Lamp
1. Remove the headlamp assembly as mentioned
previously.
5-50

2. Press the retainer clip (B), located behind the turn
signal housing, towards the outside of the vehicle.
3. Pull the turn signal housing out from the vehicle.
4. Press the locking release lever, turn the bulb socket
counterclockwise and remove it from the turn signal
housing.
5. Remove the bulb from the bulb socket.
6. Put the new bulb into the bulb socket.
7. Put the bulb socket into the turn signal housing and
turn it clockwise until it locks.
8. Put the turn signal housing back onto the vehicle
placing the hook and
posts on the inner side into
the alignment holes first and then the outer side into
the retainer bracket until you hear a click.
9. Put the headlamp assembly back into the vehicle.
5-5 1