2002 GMC SIERRA ignition

2-72 Malfunction Indicator Lamp
(Service Engine Soon Light in the United
States or Check Engine Light in Canada)
United States Canada
Your vehicle is equipped with a computer which monitors
operation of the fuel, ignition and emission control systems.
This system is called OBD II (On
-Board
Diagnostics
-Second Generation) and is intended to assure
that emissions are at acceptable levels for the life of the
vehicle, helping to produce a cleaner environment.
The SERVICE ENGINE SOON or CHECK ENGINE
light comes on to indicate that there is a problem and
service is required. Malfunctions often will be indicated
by the system before any problem is apparent.
This may prevent more serious damage to your vehicle.
This system is also designed to assist your service
technician in correctly diagnosing any malfunction.
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
NOTICE:
Modifications made to the engine, transmission,
exhaust, intake or fuel system of your vehicle
or the replacement of the original tires with
other than those of the same Tire Performance
Criteria (TPC) can affect your vehicle's emission
controls and may cause the SERVICE ENGINE
SOON or CHECK ENGINE light to come on.
Modifications to these systems could lead to
costly repairs not covered by your warranty.
This may also result in a failure to pass a
required Emission Inspection/Maintenance test.

2-73
This light should come on, as a check to show you it is
working, when the ignition is on and the engine is not
running. If the light doesn't come on, have it repaired.
This light will also come on during a malfunction in one
of two ways:

Light Flashing
-- A misfire condition has been
detected. A misfire increases vehicle emissions and
may damage the emission control system on your
vehicle. Dealer or qualified service center diagnosis
and service may be required.

Light On Steady
-- An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis and
service may be required.
If the Light Is Flashing
The following may prevent more serious damage to
your vehicle:

Reducing vehicle speed.

Avoiding hard accelerations.

Avoiding steep uphill grades.

If you are towing a trailer, reduce the amount of
cargo being hauled as soon as it is possible.If the light stops flashing and remains on steady,
see ªIf the Light Is On Steadyº following.
If the light continues to flash, when it is safe to do so,
stop the vehicle. Find a safe place to park your vehicle.
Turn the key off, wait at least 10 seconds and restart the
engine. If the light remains on steady, see ªIf the Light
Is On Steadyº following. If the light is still flashing,
follow the previous steps, and drive the vehicle to your
dealer or qualified service center for service.
If the Light Is On Steady
You may be able to correct the emission system
malfunction by considering the following:
Did you recently put fuel into your vehicle?
If so, reinstall the fuel cap, making sure to fully install
the cap. See ªFilling Your Tankº in the Index.
The diagnostic system can determine if the fuel cap
has been left off or improperly installed. A loose or
missing fuel cap will allow fuel to evaporate into the
atmosphere. A few driving trips with the cap properly
installed should turn the light off.

2-76 Cruise Light
United States Canada
The CRUISE light comes on whenever you set your
cruise control. See ªCruise Controlº in the Index.
Tow/Haul Light
This light is displayed
when the tow/haul mode
has been activated.
For more information see, ªTow/Haul Modeº in the Index.
Fuel Gage
United States Canada
When the ignition is on, the fuel gage tells you about
how much fuel you have left in your tank.
The gage will first indicate empty before you are out of
fuel, and you should get more fuel as soon as possible.

2-77
Here are some situations you may experience with
your fuel gage. None of these indicate a problem
with the fuel gage.

At the gas station, the fuel pump shuts off before
the gage reads full.

It takes a little more or less fuel to fill up than the
fuel gage indicated. For example, the gage may have
indicated the tank was half full, but it actually took
a little more or less than half the tank's capacity to
fill the tank.

The gage goes back to empty when you turn off
the ignition.
Message Center
The message center is located on the left side of the
instrument panel cluster. It gives you important safety
and maintenance facts. When you turn the ignition on,
the entire center lights up for just a few seconds.
As needed, the message center will display one of the
following messages. The message center is capable
of alternating among different messages if needed.
Battery
If this message is displayed
when the engine is running,
you may have a problem
with your charging system.
The battery display will also stay on while the key is in
RUN until the engine is started.
If the message stays on after starting the engine it could
indicate a problem with the generator drive belt, or some
other charging system problem. Have it checked right
away. Driving with this message displayed could drain
your battery.
If you must drive a short distance with this message
displayed, it helps to turn off all your accessories,
such as the radio and the air conditioner.

2-80 Check Eng Oil Pressure
This message is displayed
when the engine oil pressure
is low.
See ªOil Pressure Gageº in the Index for more information.
Check Eng Oil Level
This message is displayed
when the engine oil level
is low.
Once oil is added, it may need time to drain and settle in
the engine before this message will turn off. It is best to
let the engine cool down (if it is hot) or warm up (if it is
cold) and cycle the ignition to be sure this message turns
off. Refer to the dipstick for the correct level.
See ªEngine Oilº in the Index on how to check the oil
level and for what type of oil to add.
Change Engine Oil
This message is displayed
when the engine oil
needs to be changed.
The message is only
displayed for 15 seconds
at the start of each
ignition cycle.
When you change the engine oil, be sure to reset the
CHANGE ENGINE OIL message. See ªEngine Oil,
When to Changeº in the Index.
Security
This message is displayed
when the content
theft
-deterrent system
has been activated and
also monitors the
Passlock

system.
If the security message is displayed continuously while
driving and stays on, there may be a problem with the
Passlock system. Your vehicle will not be protected by
Passlock, and you should see your GM dealer.

2-81 Low Washer Fluid
This message is displayed
when the vehicle is low on
windshield washer fluid.
The message is only
displayed for 15 seconds
at the start of each
ignition cycle.
For more information see, ªWindshield Washer Fluidº
in the Index.
Cargo Lamp On
This message is displayed
when the cargo lamp is
turned on and the ignition
key is turned to RUN.
Low Fuel
This message is displayed
when your vehicle is
low on fuel.
Refer to the fuel gage for a better indication of the
amount of fuel remaining in the fuel tank.

2-83
Personal Trip Computer and Business
Trip Computer

Each press of the arrow button will change the
display between on/off, trip odometer, fuel used,
average fuel economy and average speed.

The ON/OFF button will turn the trip computer on
and off. The information on the trip computer only
gets updated when it is turned on. The personal
and business computers function independently, i.e.
turning one of them on does not turn the other off.

All information associated with the trip computer
will be reset when the RESET button is pressed.

If the RESET button is pressed and held for more
than two seconds, all of the trip computer settings
will reset starting from the last ignition cycle
(turning the ignition from OFF to RUN).
Timer

Each press of the ON/OFF button will turn the timer
on or off.

The RESET button will reset the timer to 00:00:00.

If turned on, the timer will accumulate whenever
the SIC is powered (the engine does not have to
be running).

The timer will rollover after 99:59:59.Vehicle History Last 15 Days

The first press of the arrow button will display the
maximum speed and accumulated mileage for the
current day.

Every press of the arrow button after will display the
maximum speed and accumulated mileage for the
previous day.

This feature requires the date and time to be set
correctly. Refer to the setting of day/date/time under
ªMenuº explained later in this section.
Annual Mileage

The annual mileage displayed is the mileage
accumulated since the annual mileage was reset.

Pressing the RESET button will reset the annual
mileage to 0.

Pressing the arrow button will display the ratio of
personal trip computer mileage to annual mileage as
a percent.

Pressing the arrow button again will display the ratio
of business trip computer mileage to annual mileage
as a percent.

2-84 Menu
Press the MENU button to choose a feature you
would like to personalize (the features are listed below).
Each press of the button will display a new item that
can be personalized. Use the arrow button to choose the
setting you would like to use within the chosen feature.
For example, you would prefer to personalize the
automatic door locks so that the automatic locking
feature is disabled. You would do the following:
1. First press the MENU button until you reach the
Automatic Door Lock screen.
2. Next, press the arrow button until you find the
Disabled setting.
3. The setting is now actually set without having to
do anything else. You can do one of three things
at this point:

You can leave the personalization mode by
pressing FUEL or TRIP.

You can just let the SIC exit the personalization
mode on its own by waiting approximately
15 seconds without touching any buttons.
The SIC will then display the day/date.

Or you can press the MENU key to move on to
the next programmable feature.The following is a list of the personal settings that can
be changed:
Automatic Door Lock

Enabled: Doors automatically lock when vehicle
speed is above 15 mph (24 km/h) for two seconds.

Disabled: Doors do not lock automatically.
Automatic Door Unlock:

Driver: Driver's door unlocks when the key is
removed from the ignition.

All: All doors unlock when the key is removed
from the ignition.

Disabled: Doors do not unlock automatically.
Remote Lock Feedback

Horn: Horn chirps on second press of the LOCK
button on the keyless entry transmitter.

Lamps: Parking lamps flash on each press of the
LOCK button on the keyless entry transmitter.

Horn and Lamps: Parking lamps flash on each
press, horn chirps on second press of LOCK on the
keyless entry transmitter.

None: No horn or lamp feedback to the LOCK
button on the keyless entry transmitter.