GMC SIERRA DENALI 2003 Owners Manual

Bulb Replacement
For any bulb changing procedure not listed in this
section, contact your dealer.
See
Replacement Bulbs on page 5-59 for the proper
types
of bulbs to use.
Halogen Bulbs
Headlamps
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.
1. Your vehicle is equipped with two pins, 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 in
and pull it straight up.
5-52

A. Low-Beam Headlamp
B. High-Beam Headlamp
Front Turn Signal, Sidemarker and
Daytime Running Lamps
2. Pull the headlamp assembly out.
3. Unplug the electrical connector.
4. Turn the old bulb counterclockwise and remove it
from the headlamp assembly.
5. Put the new bulb into the assembly and turn it
clockwise until it is tight. Use care not to touch
the bulb with your fingers or hands.
6. Plug in the electrical connector.
A. Sidemarker Lamp
B. Retainer Clip
C. Front Turn Signal Lamp
D. Daytime Running Lamp (DRL)
1. Remove the headlamp assembly as mentioned
previously.
7. Put the headlamp assembly back into the vehicle.
Install and tighten the two pins.
5-53

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 of the vehicle.
4. Press the locking release lever, turn the bulb socket
counterclockwise and remove it from the turn signal
housing.
5. Remove the old bulb from the bulb socket.
6.
7.
8.
9.
Put a new bulb into the bulb socket. Use care not
to touch the bulb with your fingers or hands.
Put the bulb socket back into the turn signal
housing and turn it clockwise until it locks.
Put the turn signal housing back into the vehicle
placing the hook and posts on the inner side into
the alignment holes first, then the outer side into the
retainer bracket until you hear a click.
Put the headlamp assembly back into the vehicle.
Roof Marker Lamps
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2. Remove the six screws on the center roof marker
lamps.
from the socket.
3. Turn the old bulb counterclockwise to remove it
4. Put a new bulb into the
socket and turn
clockwise until it locks
in place.
5-55

5. Reinstall the lens and tighten the screws.
Center High-Mounted Stoplamp
(CHMSL) and Cargo Lamp
I. Remove the screws and lift off the lamp assembly.
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A. Cargo Lamps
B. Center High-Mounted Stoplamps
2. Remove the CHMSL bulb holder back plate from
the housing by pressing the release tabs.
3. Remove the CHMSL bulb by pulling the bulb
straight out from the holder back plate. Remove
a cargo bulb by turning the socket counterclockwise
and pulling the bulb straight out.
4. If a CHMSL bulb is replaced, put the new bulb into
the socket and press it in until
it is tight.
If a cargo lamp is replaced, put a new cargo lamp
bulb into the socket and press it in until it is
tight before turning the socket counterclockwise.
5. Put the bulb holder back plate into the lamp
housing.
6. Reinstall the lamp assembly and tighten the screws.
5-57

Pickup Box Identification and
Fender Marker Lamps
1.
2.
3.
4.
5.
6.
Remove the screws and lamp assembly.
Unplug the lamp assembly harness.
Gently pry the individual lamp from the lamp
housing.
Unplug the lamp.
Plug in a new lamp and snap it into the housing.
Reinstall the lamp housing.
Taillamps
1. Open the tailgate.
A. Stoplamp
B. Turn Signal
C. Back-up Lamp
2, Remove the two rear
lamp assembly screws
near the tailgate latch and pull out the
lamp assembly.
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3. Press the release tab and turn the bulb socket
counterclockwise to remove it from the taillamp
housing.
4. Pull the old bulb straight out from the socket.
5. Press a new bulb into the socket and turn the socket
clockwise into the taillamp housing until it clicks.
6. Reinstall the rear lamp assembly.
7. Close the tailgate.
Replacement Bulbs
For anv bulb not listed here contact your dealer.
5-59

Windshield Wiper Blade Replacement
Windshield wiper blades should be inspected at least
twice a year for wear and cracking. See
At Least Twice
a Year on page
6-1 I for more information.
Replacement blades come in different types and are
removed in different ways. For proper type and length,
see
Normal Maintenance Replacement Parts on
page
5- 105.
To replace the windshield wiper blade assembly do the
following:
1. Lift the wiper arm and turn the blade until it is
facing away from the windshield.
2. Push the release lever and slide the wiper assembly
3. Install a new blade by reversing Steps 1 and 2.
toward the driver’s side of the vehicle.
5-60

I Tires
Your new vehicle comes with high-quality tires made by
a leading tire manufacturer. If you ever have questions
about your
tire warranty and where to obtain service,
see your
GMC Warranty booklet for det+
Poorly maintained and improperly used tires
are dangerous.
0 Overloading your tires can cause
overheating as a result of too much
friction. You could have an air-out and a
serious accident. See "Loading Your
Vehicle" in the Index.
CAUTION: (Continued)
0 Underinflated tires pose the same danger
as overloaded tires. The resulting accident
could cause serious injury. Check all tires
frequently to maintain the recommended
pressure. Tire pressure should be checked
when your tires are cold.
0 Overinflated tires are more likely to be cut,
punctured or broken by a sudden impact
- such as when you hit a pothole.
Keep tires at the recommended pressure.
Worn, old tires can cause accidents. If
your tread
is badly worn, or if your tires
have been damaged, replace them.
5-6 1