1999 GMC YUKON lock

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Automatic Transmission Operation
There are several different positions for your shift lever.
Your vehicle features an electronic shift position
indicator within the instrument cluster. This display
must be powered anytime the shift lever is capable of
being moved out of PARK (P). This means that if your
key is in OFF, rather than LOCK, there will be a small
current drain on your battery which could discharge
your battery over a period of time. If you need to leave
your key in the ignition in OFF for an extended period
for any reason, it is recommended that you disconnect
the battery cable from the battery to prevent discharging
your battery.PARK (P): This locks your rear wheels. It's the best
position to use when you start your engine because your
vehicle can't move easily.
CAUTION:
It is dangerous to get out of your vehicle if the
shift lever is not fully in PARK (P) with the
parking brake firmly set. Your vehicle can roll.
Don't leave your vehicle when the engine is
running unless you have to. If you have left the
engine running, the vehicle can move suddenly.
You or others could be injured. To be sure your
vehicle won't move, even when you're on fairly
level ground, always set your parking brake and
move the shift lever to PARK (P).
See ªShifting Into PARK (P)º in the Index. If
you're pulling a trailer, see ªTowing a Trailerº in
the Index.

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Four-Wheel Drive
Your vehicle has four-wheel drive. You can send your
engine's driving power to all four wheels for extra
traction. To get the most satisfaction out of four
-wheel
drive, you must be familiar with its operation. Read the
section that follows before using four
-wheel drive. You
should use 2HI for most normal driving conditions.
NOTICE:
Driving in the 4HI or 4LO positions for a long
time on dry or wet pavement could shorten the
life of your vehicle's drivetrain.
Front Axle Locking Feature
The front axle locks and unlocks automatically when
you shift the transfer case. Some delay for the axle to
lock or unlock is normal.
Automatic Transfer Case

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Move the lever up as far as it will go.
3. Be sure the transfer case is in a drive gear
-- not
in NEUTRAL.
4. Turn the ignition key to LOCK.
5. Remove the key and take it with you. If you can
leave your vehicle with the ignition key in your
hand, your vehicle is in PARK (P).
Leaving Your Vehicle With the
Engine Running
CAUTION:
It can be dangerous to leave your vehicle with the
engine running. Your vehicle could move
suddenly if the shift lever is not fully in PARK (P)
with the parking brake firmly set. With
four
-wheel drive if your transfer case is in
NEUTRAL (N), your vehicle will be free to roll,
even if your shift lever is in PARK (P). So be sure
the transfer case is in a drive gear
-- not in
NEUTRAL (N). And, if you leave the vehicle with
the engine running, it could overheat and even
catch fire. You or others could be injured. Don't
leave your vehicle with the engine running unless
you have to.

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If you have to leave your vehicle with the engine
running, be sure your vehicle is in PARK (P) and the
parking brake is firmly set before you leave it. After you
move the shift lever into PARK (P), hold the regular
brake pedal down. Then, see if you can move the shift
lever away from PARK (P) without first pulling it
toward you. If you can, it means that the shift lever
wasn't fully locked into PARK (P).
Torque Lock
If you are parking on a hill and you don't shift your
transmission into PARK (P) properly, the weight of the
vehicle may put too much force on the parking pawl in
the transmission. You may find it difficult to pull the
shift lever out of PARK (P). This is called ªtorque lock.º
To prevent torque lock, set the parking brake and then
shift into PARK (P) properly before you leave the
driver's seat. To find out how, see ªShifting Into
PARK (P)º in the Index.
When you are ready to drive, move the shift lever out of
PARK (P) before you release the parking brake.
If torque lock does occur, you may need to have another
vehicle push yours a little uphill to take some of the
pressure from the parking pawl in the transmission, so
you can pull the shift lever out of PARK (P).
Shifting Out of PARK (P)
Your vehicle has a brake-transmission shift interlock
system. You have to fully apply your regular brakes
before you can shift from PARK (P) when the ignition is
in RUN. See ªAutomatic Transmissionº in the Index.
If you cannot shift out of PARK (P), ease pressure on
the shift lever and push the shift lever all the way up
into PARK (P) as you maintain brake application. Then,
move the shift lever into the gear you want.
If you ever hold the brake pedal down but still can't
shift out of PARK (P), try this:
1. Turn the key to the OFF ignition position.
2. Apply and hold the brake until the end of Step 4.
3. Shift the vehicle to NEUTRAL (N).
4. Start the vehicle and then shift to the drive gear
you want.
5. Have the brake
-transmission shift interlock system
fixed as soon as you can.

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Locking Rear Axle
Your locking rear axle can give you additional traction
on snow, mud, ice, sand or gravel. It works like a
standard axle most of the time, but when one of the rear
wheels has no traction and the other does, this feature
will allow the wheel with traction to move the vehicle.
Windows
Power Windows
The power window controls are located on each of the
side doors.The driver's door has a switch for the passenger
windows as well. Your power windows will work when
the ignition has been turned to ACCESSORY or RUN or
when Retained Accessory Power (RAP) is present. See
ªRetained Accessory Powerº in the Index.
Push the rear of the switch with the power window
symbol on it to lower the window.
Push the front of the switch with the power window
symbol on it to raise the window.
The driver's window switch has an express
-down
feature that allows the window to be lowered without
holding the switch. Press and hold the side of the
window switch marked AUTO for one second to
activate the express
-down mode. The express-down
mode can be canceled at any time by pressing the
opposite side of the switch. To open the window
partway, lightly tap the switch until the window is at the
desired position.
The power window switch has a lockout feature. This
feature prevents the passenger's windows from
operating except from the driver's position, when the
front driver's side switch is in LOCK. When the switch
is moved to NORM, the rear power windows will
operate again.

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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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2-42 Windshield Washer
At the top of the lever,
there's a paddle with the
word PUSH on it. To spray
washer fluid on the
windshield, push the paddle.
CAUTION:
In freezing weather, don't use your washer until
the windshield is warmed. Otherwise the washer
fluid can form ice on the windshield, blocking
your vision.
Washer fluid will spray as long as you push the paddle.
When you let go of the paddle, the wipers will continue
to wipe for a few seconds and then either stop or return
to the preset speed.
The use of hood
-mounted air deflectors may adversely
affect windshield wiper and washer performance.
Rear Window Wiper and Washer
The rear window
wiper/washer switch is on
your instrument panel, to
the right of the gage cluster.
To turn the wiper on, slide the switch all the way up.
For delay wiping, slide the switch even with DELAY in
the center position of the rear wiper control. The wiper
will cycle every nine seconds.

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Exterior Lamps
Your parking/headlamp knob is on the driver's side of
your instrument panel.
Turn the knob clockwise, to the parking lamp symbol, to
turn on the following:

Parking Lamps

Sidemarker Lamps
Taillamps

License Plate Lamps

Instrument Panel Lights
Turn the knob clockwise again, to the master lighting
symbol, to turn on all the lamps listed as well as
the headlamps.
Turn the knob counterclockwise, to OFF, to turn off
your lamps. For additional information on headlamp
operation, see ªHeadlamp Delayº in the Index.
Turn the thumbwheel next to the knob up to adjust
instrument panel lights. Turn the thumbwheel up to the
first notch to return the radio display and gearshift
indicator LED display to full intensity when the
headlamps or parking lamps are on. To turn on the dome
lamps (with the vehicle doors closed) turn the
thumbwheel up to the second notch position.
You can switch your headlamps from high to low beam
by pulling on the turn signal/high
-beam lever.
A circuit breaker protects your headlamps. If you have
an electrical overload, your headlamps will flicker on
and off. Have your headlamp wiring checked right away
if this happens.