check engine light CHEVROLET TRAIL BLAZER 2007 1.G Owners Manual

When the alarm is set the power door unlock
switch will not work.
If the alarm does not sound when it should but the
headlamps ash, check to see if the horn works.
The horn fuse may be blown. To replace the fuse,
seeFuses and Circuit Breakers on page 503.
If the alarm does not sound or the headlamps do
not ash, the vehicle should be serviced by
your dealer.
Passlock®
Your vehicle has the Passlock®theft-deterrent
system.
Passlock
®is a passive theft-deterrent system that
enables fuel if the ignition lock cylinder is turned
with a valid key. If a correct key is not used or the
ignition lock cylinder has been tampered with, the
fuel system is disabled and the vehicle will not start.
During normal operation, the security light will
turn off about ve seconds after the key is turned
to RUN.If the engine stalls and the security light ashes,
wait about 10 minutes until the light stops
ashing before trying to restart the engine.
Remember to release the key from START as
soon as the engine starts.
If the engine does not start after three tries, the
vehicle needs service.
If the engine is running and the security light comes
on, you will be able to restart the engine if you turn
the engine off. However, your Passlock
®system is
not working properly and must be serviced by
your dealer. Your vehicle is not protected by
Passlock
®at this time. You may also want to check
the fuse. SeeFuses and Circuit Breakers on
page 503. See your dealer for service.
In an emergency, call the GM Roadside
Assistance Center. SeeRoadside Assistance
Program on page 544.
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StabiliTrak®Indicator Light......................... 210
Engine Coolant Temperature Gage............ 211
Tire Pressure Light.................................... 211
Malfunction Indicator Lamp........................ 212
Oil Pressure Gage..................................... 215
Change Engine Oil Light........................... 216
Security Light............................................ 216
Cruise Control Light.................................. 217
Reduced Engine Power Light.................... 217
Highbeam On Light................................... 217
Service Four-Wheel Drive Warning Light...... 218
Check Gages Warning Light...................... 218
Gate Ajar Light.......................................... 218
Fuel Gage................................................. 219
Low Fuel Warning Light............................ 219
Check Gas Cap Light................................ 219
Driver Information Center (DIC).................. 220
DIC Operation and Displays...................... 221
DIC Warnings and Messages.................... 224
DIC Vehicle Customization........................ 231Audio System(s)......................................... 238
Setting the Time........................................ 239
Radio with CD (Base)............................... 240
Radio with CD (MP3)................................ 250
Radio with Six-Disc CD............................. 260
Using an MP3........................................... 274
XM Radio Messages................................. 280
Navigation/Radio System........................... 284
Rear Seat Entertainment System............... 284
Rear Seat Audio (RSA)............................. 298
Theft-Deterrent Feature............................. 300
Audio Steering Wheel Controls.................. 300
Radio Reception........................................ 301
Care of Your CDs and DVDs.................... 302
Care of the CD and DVD Player............... 302
Fixed Mast Antenna.................................. 303
XM™ Satellite Radio Antenna System....... 303
Chime Level Adjustment............................ 303
Section 3 Instrument Panel
168

Warning Lights, Gages,
and Indicators
This part describes the warning lights and
gages on your vehicle. The pictures help to
locate them.
Warning lights and gages can signal that
something is wrong before it becomes serious
enough to cause an expensive repair or
replacement. Paying attention to the warning
lights and gages could also save you or others
from injury.
Warning lights come on when there may be or
is a problem with one of your vehicle’s functions.
As the details show on the next few pages,
some warning lights come on briey when you
start the engine just to let you know they are
working. If you are familiar with this section,
you should not be alarmed when this happens.Gages can indicate when there may be or is a
problem with one of your vehicle’s functions.
Often gages and warning lights work together
to let you know when there is a problem with
your vehicle.
When one of the warning lights comes on and
stays on as you are driving, or when one of
the gages shows there may be a problem, check
the section that tells you what to do about it.
Please follow this manual’s advice. Waiting to
do repairs can be costly and even dangerous.
So please get to know your vehicle’s warning
lights and gages. They can be a big help.
Your vehicle may also have a Driver Information
Center (DIC) that works along with the warning
lights and gages. SeeDriver Information
Center (DIC) on page 220for more information.
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If, after several seconds, all status indicator lights
remain on, or if there are no lights at all, there
may be a problem with the lights or the passenger
sensing system. See your dealer for service.
{CAUTION:
If the off indicator and the airbag
readiness light ever come on together,
it means that something may be wrong
with the airbag system. If this ever
happens, have the vehicle serviced
promptly, because an adult-size person
sitting in the right front passenger seat
may not have the protection of the frontal
airbag. SeeAirbag Readiness Light
on page 202.
Charging System Light
The charging system
light will come on briey
when you turn on
the ignition, but the
engine is not running,
as a check to show
you it is working.
It should go out once the engine is running.
If it stays on, or comes on while you are driving,
you may have a problem with the charging system.
It could indicate that you have problems with a
generator drive belt, or another electrical problem.
Have it checked right away. Driving while this
light is on could drain your battery.
If you must drive a short distance with the light on,
be certain to turn off all your accessories, such
as the radio and air conditioner.
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Engine Coolant Temperature Gage
This gage shows the engine coolant temperature.
If the gage pointer moves into the red area, it
means that your engine coolant has overheated.
If you have been operating your vehicle under
normal driving conditions, you should pull off the
road, stop your vehicle and turn off the engine
as soon as possible.
SeeEngine Overheating on page 418for more
information.
Tire Pressure Light
This light will come on
briey when you turn
the ignition to RUN.
This light will also come on when one or more
of your tires are signicantly underinated.
If your vehicle has a Driver Information
Center (DIC), a CHECK TIRE PRESSURE
DIC message will accompany the light, see
DIC Warnings and Messages on page 224.
Stop and check your tires as soon as it is safe to do
so. If underinated, inate to the proper pressure.
SeeTires on page 448for more information.
This light will ash for approximately 70 seconds
and then turn on solid if a problem is detected
with the Tire Pressure Monitor system.
SeeTire Pressure Monitor System on page 459
for more information.
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211

Malfunction Indicator Lamp
Check Engine Light
Your vehicle has 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 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 awhile, the emission controls
might not work as well, your vehicle’s fuel
economy might not be as good, and the engine
might not run as smoothly. This could lead to
costly repairs that might not be covered by
your warranty.
Notice:Modications 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 can
cause this light to come on. Modications to
these systems could lead to costly repairs not
covered by your warranty. This could also
result in a failure to pass a required Emission
Inspection/Maintenance test. SeeAccessories
and Modifications on page 386.
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 does not come
on, have it repaired. This light will also come on
during a malfunction in one of two ways:
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Did you just drive through a deep puddle of water?
If so, your electrical system may be wet. The
condition will usually be corrected when the
electrical system dries out. A few driving trips
should turn the light off.
Have you recently changed brands of fuel?
If so, be sure to fuel your vehicle with quality fuel.
SeeGasoline Octane on page 388. Poor fuel
quality will cause your engine not to run as
efficiently as designed. You may notice this as
stalling after start-up, stalling when you put
the vehicle into gear, misring, hesitation on
acceleration, or stumbling on acceleration.
(These conditions may go away once the engine
is warmed up.) This will be detected by the
system and cause the light to turn on.
If you experience one or more of these conditions,
change the fuel brand you use. It will require at
least one full tank of the proper fuel to turn the
light off.
If none of the above steps have made the light turn
off, your dealer can check the vehicle. Your dealer
has the proper test equipment and diagnostic tools
to x any mechanical or electrical problems that
may have developed.Emissions Inspection and
Maintenance Programs
Some state/provincial and local governments have
or may begin programs to inspect the emission
control equipment on your vehicle. Failure to pass
this inspection could prevent you from getting a
vehicle registration.
Here are some things you need to know to help
your vehicle pass an inspection:
Your vehicle will not pass this inspection if the
check engine light is on or not working properly.
Your vehicle will not pass this inspection if the
OBD (on-board diagnostic) system determines that
critical emission control systems have not been
completely diagnosed by the system. The vehicle
would be considered not ready for inspection.
This can happen if you have recently replaced
your battery or if your battery has run down. The
diagnostic system is designed to evaluate critical
emission control systems during normal driving.
This may take several days of routine driving. If you
have done this and your vehicle still does not pass
the inspection for lack of OBD system readiness,
your dealer can prepare the vehicle for inspection.
214

Service Four-Wheel Drive
Warning Light
This light should come
on briey when you
turn on the ignition,
as a check to show
you it is working.
The service four-wheel drive light comes on,
except for the SS model, to indicate that there
may be a problem with the drive system and
service is required. Malfunctions can be indicated
by the system before any problem is apparent,
which may prevent serious damage to the vehicle.
This system is also designed to assist your GM
dealer in correctly diagnosing a malfunction.
Check Gages Warning Light
The check gages light
will come on briey
when you are starting
the engine.
If the light comes on and stays on while you
are driving, check your coolant temperature and
engine oil pressure gages to see if they are in
the warning zones.
Gate Ajar Light
If this light comes on,
the liftgate or liftglass
is not completely shut.
Close the liftgate or liftglass. Never drive with the
liftgate or liftglass even partially open.
218

Fuel Gage
When the ignition is on, the fuel gage tells you
about how much fuel you have remaining.
Here are four things that some owners ask about.
None of these show a problem with your fuel gage:
At the gas station, the gas pump shuts off
before the gage reads full.
It takes a little more or less fuel to ll up than
the 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 ll the tank.
The gage moves a little when you turn a corner
or speed up.
The gage doesn’t go back to empty when you
turn off the ignition.
Low Fuel Warning Light
The light next to the fuel gage will come on briey
when you are starting the engine.
This light comes on when the fuel tank is low on
fuel. To turn it off, add fuel to the fuel tank.
Check Gas Cap Light
If your vehicle has this
light, it will come on if
your gas cap is not
securely fastened.
SeeMalfunction Indicator Lamp on page 212for
more information.
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219

CHANGE ENGINE OIL
This message displays when the engine oil needs
to be changed and service is required for your
vehicle. SeeScheduled Maintenance on page 519
andEngine Oil on page 402for more information.
Also seeEngine Oil Life System on page 408
for information on how to reset the message.
This message clears itself after 10 seconds until
the next ignition cycle.
CHECK TIRE PRESSURE
This message displays when the tire pressure in
one of the vehicle’s tires needs to be checked.
Press any of the DIC buttons, or the trip stem,
to acknowledge this message and clear it from the
DIC display.
If this message appears on the DIC, stop as soon
as you can. Have the tire pressures checked
and set to those shown on the Tire Loading
Information label. SeeTires on page 448,Loading
Your Vehicle on page 356, andInation - Tire
Pressure on page 457. If the tire pressure is low,
the low tire pressure warning light comes on.
SeeTire Pressure Light on page 211.
CHECK WASHER FLUID
This message displays if the washer uid level is
low. Adding washer uid to the windshield washer
uid reservoir clears this message. SeeWindshield
Washer Fluid on page 427. This message clears
itself after 10 seconds, or you can press any of the
DIC buttons, or the trip stem, to acknowledge this
message and clear it from the DIC display.
CURB VIEW ACTIVATED
This message displays when the passenger
outside rearview mirror moves into the curb view
position. SeeOutside Curb View Assist Mirror
on page 144for more information.
DRIVER DOOR AJAR
This message displays and a chime sounds if
the driver’s door is not fully closed. Stop and turn
off the vehicle, check the door for obstructions,
and close the door again. Check to see if the
message still appears on the DIC. Press any of
the DIC buttons, or the trip stem, to acknowledge
this message and clear it from the DIC display.
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