1999 GMC YUKON tailgate

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2-19 Theft-Deterrent Arming Verification
Your vehicle comes with the theft-deterrent arming
verification set in Mode 3. This means that if you arm
the system using the keyless entry transmitter, your
headlamps and parking lamps will flash and your horn
will chirp twice to verify that the system is armed. If it
only chirps once, the tailgate or the panel doors are open
or unlatched. In addition, if the system did not arm, the
horn will chirp once and the theft
-deterrent indicator on
the center floor console will not flash. If you arm the
system using either the power door lock switch or by
passive arming, only the headlamps and parking lamps
will flash for verification. To change the factory setting,
do the following:
1. Press the LOCK switch on the keyless
entry transmitter.
2. Count the number of chimes you hear. The number
of chimes tells you which mode your vehicle is
set for.
3. Press the LOCK switch on the keyless entry
transmitter until you hear the number of chimes that
corresponds to the mode selection you want.
Mode 1: All Off (No horn chirps or headlamps and
parking lamps will flash.)Mode 2: Horn and Lamps (Your headlamps and parking
lamps will flash and your horn will chirp twice to verify
the system is armed using any arming method.)
Headlamps and parking lamps only will flash
when disarming.
Mode 3: Horn and Lamps/Lamps (If you use the keyless
entry transmitter to arm the system, your headlamps and
parking lamps will flash and your horn will chirp twice
to verify that the system is armed. If you use either the
power door lock switch or passive arming, only your
headlamps and parking lamps will flash for
verification.) The headlamps and parking lamps will
flash only when disarming.
Mode 4: Lamps (When your vehicle arms, only your
headlamps and parking lamps will flash for
verification.) The headlamps and parking lamps will
flash only when disarming.
Driver's Door Alarm Delay
If you open the driver's door using your key, the alarm
will not sound for eight seconds.
Leaving Programming Mode
When programming is done, turn the ignition to OFF
and replace the RADIO fuse (Fuse 17).

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2-39 Electric Tailgate Glass Release
Before operating your electric tailgate glass release, see
ªRear Doorsº in the the Index.
Your vehicle has the theft
-deterrent system. If it is armed, use
the transmitter, not the key to open the tailgate or the alarm
will sound. The hatch switch will not work while the system
is armed. See ªTheft
-Deterrent Systemº in the Index.
The electric hatch release
button lets you release the
tailgate glass. To release
the glass, press the top of
the button.
Then, lift the window up to open.
The shift lever must be in PARK (P) or NEUTRAL (N)
for the release to work.
There is also a power door lock switch at the rear of the
vehicle which will allow you to lock or unlock all of the
doors. See ªPower Doors Locksº in the Index.
Horn
Push on the air bag module in the center of the steering
wheel to sound the horn.
Tilt Wheel
A tilt steering wheel allows
you to adjust the steering
wheel before you drive.
You can also raise it to the highest level to give your
legs more room when you enter and exit the vehicle.
To tilt the wheel, hold the steering wheel and pull the
lever. Move the steering wheel to a comfortable level,
then release the lever to lock the wheel in place.

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2-60
NOTICE:
Loading cargo that weighs more than 200 lbs.
(90.6 kg) on the luggage carrier may damage
your vehicle. When you carry large things, never
let them hang over the rear or the sides of your
vehicle. Load your cargo so that it rests on the
slats and does not scratch or damage the vehicle.
Put the cargo against the side rails and fasten it
securely to the luggage carrier.
Don't exceed the maximum vehicle capacity when
loading your vehicle. For more information on vehicle
capacity and loading, see ªLoading Your Vehicleº in
the Index.
To prevent damage or loss of cargo as you're driving,
check now and then to make sure the luggage carrier and
cargo are still securely fastened.
Be sure the cargo is properly loaded.
If small heavy objects are placed on the roof, place
the load in the area over the rear wheels. If you need
to, cut a piece of 3/8 inch plywood to fit inside the
crossrails and side rails to spread the load.

Tie the load to the crossrails or the side rail supports.
Use the crossrails only to keep the load from sliding.

If you need to carry long items, move the crossrails
as far apart as they will go. Tie the load to the
crossrails and tie loops. Also tie the load to the
bumpers. Do not tie the load so tightly that the
crossrails or side rails are damaged.

For the purpose of wind noise reduction, locate
the front crossrail approximately 18 to 24 inches
(46 cm to 58 cm) rearward of the front supports.

After moving the crossrails, be sure to tighten all the
slider screws.
Your vehicle has a Center High
-Mounted Stoplamp
(CHMSL) located above the tailgate glass or above the
rear load doors.
If items are loaded on the roof of the vehicle, care should
be taken not to block or damage the CHMSL unit.

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6-37
3. Remove the connector from the bulb by lifting the
tabs on the sides of the connector.
4. Insert the new bulb into the connector until the tabs
lock into the connector.
5. Insert the fog lamp bulb socket into the fog lamp
housing and turn it clockwise one
-quarter of a turn.
Center High-Mounted Stoplamp (CHMSL)
The individual bulbs in the CHMSL are not replaceable.
See your dealer for assistance.
Rear Lamps
1. Open the tailgate or rear doors.
2. Remove the two black plastic plugs from the rear
lamp assembly access holes.
3. Remove the two rear
lamp assembly screws
inside the fender and
pull out the lamp
assembly. You may want
to use a magnetic
screwdriver when
removing the screws.

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6-38
4. Remove the screws from
the bulb retainer and
take the bulb retainer off
of the lamp assembly.
5. Pull the old bulb straight out of the socket.
6. Put in a new bulb and push it straight in until it
is tight.
7. Replace the bulb retainer.
8. Replace the rear lamp assembly and tighten the
screws. You may want to use a magnetic screwdriver
when installing the screws.
9. Close the tailgate or rear doors.Windshield Wiper Blade Replacement
Windshield wiper blades should be inspected at least
twice a year for wear and cracking. See ªWiper Blade
Checkº in Section 7 of this manual under Part B ªOwner
Checks and Servicesº for more information.

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Fuse/Circuit
BreakerUsage
1 Stop/TCC Switch, Buzzer, CHMSL,
Hazard Lamps, Stoplamps
2 Transfer Case
3 Courtesy Lamps, Cargo Lamp, Glove
Box Lamp, Dome/Reading Lamps,
Vanity Mirrors, Power MirrorsFuse/Circuit
BreakerUsage
4 Instrument Cluster, DRL Relay, Lamp
Switch, Keyless Entry, Low Coolant
Module, Illuminated Entry Module
5 Rear Comfort Controls
6 Cruise Control
7 Auxiliary Power Outlet
8 Crank
9 License Lamp, Parking Lamps,
Taillamps, Tailgate Lamps, Front
Sidemarkers, Fog Lamp Relay, Door
Switch Illumination, Fender Lamps,
Headlamp Switch Illumination
10 Air Bag System
11 Wiper Motor, Washer Pump
12 A/C, A/C Blower, High Blower Relay
13 Power Amp, Rear Liftglass, Cigarette
Lighter, Door Lock Relay, Power
Lumbar Seat
14 4WD Indicator, Cluster, Front and Rear
Comfort Controls, Instrument Switches,
Radio Illumination, Chime Module

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Also look for any opened or broken air bag coverings,
and have them repaired or replaced. (The air bag system
does not need regular maintenance.)
Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace blade
inserts that appear worn or damaged or that streak or
miss areas of the windshield. Also see ªWiper Blades,
Cleaningº in the Index.
Air Cleaner Filter Restriction Indicator Check
Your vehicle has an indicator on the engine that lets you
know when the air cleaner filter is dirty and needs to be
changed. Check indicator at least twice a year or when
your oil is changed, whichever occurs first. See ªAir
Cleanerº in the Index for more information. Inspect your
air cleaner filter restriction indicator more often if the
vehicle is used in dusty areas or under off road conditions.
Weatherstrip Lubrication
Silicone grease on weatherstrips will make them last
longer, seal better, and not stick or squeak. Apply
silicone grease with a clean cloth. During very cold,
damp weather more frequent application may be
required. (See ªRecommended Fluids and Lubricantsº in
the Index.)Automatic Transmission Check
Check the transmission fluid level; add if needed. See
ªAutomatic Transmissionº in the Index. A fluid loss may
indicate a problem. Check the system and repair if needed.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part D.
Body Lubrication Service
Lubricate all body hood and body door hinges, body
door hinge pins, hood latch assembly, secondary latch,
pivots, spring anchor, and release pawl, rear
compartment hinges, tailgate hinge, tailgate linkage,
outer tailgate handle pivot points, latches, fuel door, fuel
door hinge, locks and folding seat hardware. Part D tells
you what to use. More frequent lubrication may be
required when exposed to a corrosive environment.

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USAGEFLUID/LUBRICANT
Front AxleSAE 80W-90 Axle Lubricant (GM
Part No. 1052271 or equivalent).
Rear Axle
(Locking
Differential)SAE 80W-90 Axle Lubricant;
use only GM Part No. 1052271.
Do not add friction modifier.
Automatic
Transfer CaseAutomatic Transfer Case Fluid
(GM Part No. 12378396).
Front Axle
Propshaft Spline
and Universal
JointsChassis Lubricant (GM Part
No. 12377985 or equivalent) or
lubricant meeting requirements of
NLGI # 2, Category LB
or GC
-LB.
Hood Latch
Assembly,
Secondary Latch,
Pivots, Spring
Anchor and
Release PawlLubriplate
Lubricant Aerosol
(GM Part No. 12346293 or
equivalent) or lubricant meeting
requirements of NLGI # 2,
Category LB or GC
-LB.
USAGEFLUID/LUBRICANT
Hood and Door
HingesMulti-Purpose Lubricant,
Superlube
(GM Part
No. 12346241 or equivalent).
Body Door
Hinge Pins,
Tailgate Hinge
and Linkage,
Folding Seat and
Fuel Door HingeMulti-Purpose Lubricant,
Superlube
(GM Part
No. 12346241 or equivalent).
Outer Tailgate
Handle Pivot
PointsMulti-Purpose Lubricant,
Superlube
(GM Part
No. 12346241 or equivalent).
Weatherstrip
ConditioningDielectric Silicone Grease (GM
Part No. 12345579 or equivalent).
Weatherstrip
SqueaksSynthetic Grease with Teflon,
Superlube
(GM Part
No. 12371287 or equivalent).