1999 GMC YUKON headlamp

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Alarm/Panic Mode
The theft
-deterrent system provides a fourth button on
your transmitter. This button is the alarm/panic button. If
you are involved in a panic situation, press this button and
your vehicle's horn will sound and the headlamps will
flash. This will draw needed attention to you and your
vehicle. To turn this feature off, either push the panic
button again or turn the ignition to RUN. This feature
will not work if your ignition is on or if the transmitter is
30 feet (9 m) or more away from your vehicle.
Transmitter Verification
This feature provides feedback to the holder of the
keyless entry transmitter that a command has been
received by the keyless entry receiver. The headlamps
and parking lamps will flash on every lock and unlock
command and the horn will sound only if the LOCK
button is pressed twice within five seconds. This allows
for silent operation of locking and unlocking, unless a
confirming horn chirp is desired. Other options may be
selected for this feature (see ªFeature Customizationº in
the Index).
Matching Transmitter(s) To Your Vehicle
Each remote keyless entry transmitter is coded to
prevent another transmitter from unlocking your vehicle.
If a transmitter is lost or stolen, a replacement can be
purchased through your dealer. Remember to bring any
remaining transmitters with you when you go to your
dealer. When the dealer matches the replacement
transmitter to your vehicle, any remaining transmitters
must also be matched. Once your dealer has coded the
new transmitter, the lost transmitter will not unlock your
vehicle. Each vehicle can have only four transmitters
matched to it.
Have each transmitter you intend to match ready for the
next steps. To match transmitters to your vehicle:
1. Turn the ignition to RUN, then to OFF. This will
disarm the theft
-deterrent system.
2. Remove the RADIO fuse (Fuse 17). This fuse is
located in the main fuse block, which is located on
the left side of your main instrument panel. When
the fuse block is open the radio fuse is located on the
lower right hand corner of your instrument panel.
See ªFuses and Circuit Breakersº in the Index.

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To replace the battery:
1. Insert a small coin, or flathead screwdriver, to
separate the bottom of the transmitter from the top.
2. Remove the battery and replace it with a new one,
making sure the positive (+) side of the battery is
facing down.3. Snap the top and bottom together.
4. Test the operation of the transmitter with your
vehicle. If the transmitter does not work, try
synchronizing the transmitter with the receiver.
Resynchronization
Resynchronization may be necessary due to the security
method used by this system. The transmitter does not
send the same signal twice to the receiver. The receiver
will not respond to a signal it has been sent previously.
This prevents anyone from recording and playing back
the signal from the transmitter.
To resynchronize your transmitter, stand close to your
vehicle and simultaneously press and hold the LOCK
and UNLOCK buttons on the transmitter for at least
eight seconds. The door locks should cycle and the
parking lamps and headlamps should flash to confirm
synchronization. If this does not happen, you may need
to replace the battery in your transmitter or match the
transmitter to your vehicle. If the locks still do not cycle,
see your dealer for service.

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2-14 Shock Sensor
A shock sensor triggers the alarm when it detects a blow
to your vehicle. It is located in the center floor console.
There are two levels of alarms via the shock sensor: two
horn blasts and the headlamp/parking lamps flash for
non
-threatening blows to the vehicle or a full
two
-minute alarm for harder blows to the vehicle. Its
sensitivity can be adjusted if more or less sensitivity is
desired. If sensitivity is increased too much, it may give
false alarms caused by gusts of wind or other natural
events that may shake the vehicle.
The adjustment for the
shock sensor sensitivity can
be accessed through a hole
in the forward wall of the
main bin of the center
floor console.
Using a small flat
-tipped screwdriver, turn the adjuster
clockwise to increase sensitivity and turn counterclockwiseto decrease sensitivity. The shock sensor is ignored by the
alarm system when the ignition is on, when the tailgate or
panel doors are open, when the alarm is disarmed, when
customized to be ignored and for five seconds after the
horn sounds an alarm or chirp. The shock sensor is
ignored after triggering three full alarms until the system
is rearmed.
Arming the System
The alarm system can be armed to detect break-ins by
locking your vehicle using the keyless entry or by
locking the doors with the power door lock switch.
Passive arming is also available if you would like the
system to arm all by itself after the doors have been
closed for a short time. See ªFeature Customizationº in
the Index. When the system is armed, a red light will
flash on the center floor console briefly once every two
seconds. If you return to your vehicle and the red light is
flashing two brief flashes every two seconds, the system
is armed and the shock sensor had triggered a two
minute alarm. If the red light is flashing three times
every two seconds, the system is armed and there was an
intrusion that sounded the alarm.
Horn chirps and parking lamp flashes can be set to
your choice.

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Remote Keyless Entry Transmitter Locking
If all the doors are closed, locking the vehicle with the
transmitter will immediately arm the system. The horn
will chirp twice and the headlamps and parking lamps
will flash, confirming that the system is armed if that
mode is selected. If any door is open when the
transmitter LOCK button is pressed, the system goes
into an armed wait mode, waiting for the doors to close.
Once they are closed, the system will arm and the
headlamps and parking lamps will flash. If the tailgate
or panel doors are open or ajar at the time the system is
arming, the headlamps and parking lamps flash once.
Power Door Lock Switch Locking
If any door is open when the power door lock switch is
pressed, the system goes into an armed wait mode,
waiting for the doors to close. Once they are closed, the
system will arm and the parking lamps will flash. If both
of the doors are closed when the power lock switch is
pressed, the system assumes you are inside the vehicle,
so it will not arm. Locking the doors by using the
manual door locks will not arm the system.Passive Arming
If the LOCK button on the keyless entry transmitter or
the power door lock switch is pressed, the system will
arm immediately. If the ignition was just turned off and
a door was opened, the system will arm six seconds after
the doors, tailgate or panel doors are closed, whether or
not you lock them with the manual door lock. If a door
is opened without the ignition being turned on, the
system will wait 30 seconds after the doors, tailgate or
panel doors are closed before arming, allowing you time
to get into the vehicle and put the key in the ignition.
The parking lamps will flash when the system arms.
Passive arming is not enabled from the factory.
Disarming the System
There are two ways to disarm the system:
1. Press the UNLOCK button on the keyless entry
transmitter. If the horn chirps two or three times
when you unlock the vehicle, the alarm sounded in
your absence. Two chirps means that the shock
sensor was set off and three chirps means that a door,
tailgate or the panel doors were opened.
2. Turn the ignition to RUN with the proper key.
For more information on customizing the features
mentioned here, see ªFeature Customizationº in the Index.

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5. Turn the ignition to ACCESSORY.
You should hear two chimes to verify that the system
is in programming mode. You will also be able to set
Keyless Entry Verification, Arming Method, Arming
Verification, Driver's Door Delay, Shock Sensor
Enable and Lockout Prevention.
Lockout Prevention
Your vehicle comes with this feature set in Mode 2. This
means that your power door locks will not lock when
the keys are in the ignition and a door is open. To
change the factory setting, do the following:
1. Press the LOCK switch on the door.
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 door until you hear
the number of chimes that correspond to the mode
selection you want.
Mode 1: Both Off (Doors will lock/unlock when you
press the power door lock switch).
Mode 2: Lockout Prevention Enabled
Keyless Entry Verification
Your vehicle comes with this feature set in Mode 5. This
means that when you use the keyless entry transmitter to
lock/unlock your vehicle, your headlamps and parking
lamps will flash briefly upon the first press on LOCK.
Your horn will sound briefly and your headlamps and
parking lamps will flash briefly upon the second press
on LOCK. Your headlamps and parking lamps will flash
briefly upon any press on UNLOCK. To change the
factory setting, do the following:
1. Press the UNLOCK button 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 UNLOCK button on the keyless entry
transmitter until you hear the number of chimes that
correspond to the mode selection you want.
Mode 1: All Off (The headlamps will not flash and the
horn will not sound to provide you feedback that a
lock/unlock command has been received by the keyless
entry transmitter.)

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Mode 2: Horn and Lamps/Lamps (Your horn will sound
briefly and your headlamps and parking lamps will flash
when you press LOCK on the keyless entry transmitter.
Only your headlamps and parking lamps will flash when
you press UNLOCK.)
Mode 3: Horn and Lamps (Your horn will sound briefly
and your headlamps and parking lamps will flash every
time you push LOCK or UNLOCK.)
Mode 4: Lamps (Your headlamps and parking lamps
will flash every time you press LOCK or UNLOCK.)
Mode 5: Lamps/Horn and Lamps/Lamps (Your
headlamps and parking lamps will flash upon the first
press on LOCK, your headlamps and parking lamps will
flash and your horn will sound upon the second press on
LOCK and your headlamps and parking lamps will flash
upon any press on UNLOCK.)
Theft-Deterrent Arming Method
Your vehicle comes with this feature set in Mode 3. This
means that both your keyless entry transmitter and the
power door lock switch will actively arm the system. To
change the factory setting, do the following:
1. Press the UNLOCK switch on the door.2. Count the number of chimes you hear. The number
of chimes tells you which mode your vehicle is
set for.
3. Press the UNLOCK switch on the door until you
hear the number of chimes that correspond to the
mode selection you want.
Mode 1: Alarm System Off (The system will not arm.)
Mode 2: Keyless Entry Transmitter Lock (When you
lock your doors using the keyless entry transmitter, the
system will arm.)
Mode 3: Keyless Entry Transmitter/Power Door Lock
Switch (If you use either the keyless entry transmitter or
the power door lock switch to lock the doors, the system
will arm.)
Mode 4: Passive arming and Keyless Entry
Transmitter/Power Door Lock Switch Arming (The
system will arm itself after all doors are closed, plus
arming per mode 3.)

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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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Multifunction Lever
The lever on the left side of the steering column
includes your:

Turn Signal and Lane Change Indicator

Headlamp High/Low Beam Changer

Windshield Wipers

Windshield Washer

Cruise Control
Turn Signal and Lane Change Indicator
The turn signal has two upward (for right) and two
downward (for left) positions. These positions allow you
to signal a turn or a lane change.
To signal a turn, move the lever all the way up or down.
When the turn is finished, the lever will return automatically.
An arrow on the instrument
panel will flash in the
direction of the turn or
lane change.
To signal a lane change, just raise or lower the lever
until the arrow starts to flash. Hold it there until you
complete your lane change. The lever will return by
itself when you release it.
If you move the lever all the way up or down and the arrow
flashes at twice the normal rate, a signal bulb may be burned
out and other drivers may not see your turn signal.
If a bulb is burned out, replace it to help avoid an
accident. If the arrows don't go on at all when you
signal a turn, check for burned
-out bulbs and a blown
fuse (see ªFusesº in the Index).