ignition CADILLAC STS 2009 1.G Service Manual

Antilock Brake System (ABS)
Warning Light
For vehicles with
the Antilock Brake
System (ABS), this light
comes on briey when
the engine is started.
If it does not, have the vehicle serviced by your
dealer/retailer. If the system is working normally the
indicator light then goes off.
If the ABS light stays on, turn the ignition off. If the
light comes on while driving, stop as soon as it is safely
possible and turn the ignition off. Then start the engine
again to reset the system. If the ABS light stays on, or
comes on again while driving, the vehicle needs service.
If the regular brake system warning light is not on, the
vehicle still has brakes, but not antilock brakes. If the
regular brake system warning light is also on, the vehicle
does not have antilock brakes and there is a problem with
the regular brakes. SeeBrake System Warning Light on
page 3-62.
For vehicles with a Driver Information Center (DIC),
seeDIC Warnings and Messages on page 3-79for
all brake related DIC messages.
Traction Control System (TCS)
Warning Light
The TCS warning light
comes on briey when
the engine is started.
If it does not, have the vehicle serviced by your
dealer/retailer.
If the Traction Control System (TCS) warning light
comes on and stays on, there may be a problem with
the TCS.
The light also comes on if the TCS is turned off using
the traction control on/off button located on the console.
If this light stays on or comes on while driving, pull
off the road as soon as possible and stop carefully.
Turn the engine off and then restart it. If the light still
stays on or comes back on again while driving, the
vehicle needs service. Have the TCS inspected as
soon as possible. SeeTraction Control System (TCS)
on page 4-10andStabiliTrak
®System on page 4-6
for more information.
Also seeCompetitive Driving Mode on page 4-11for
more information.
3-63

When the Light Flashes First and Then is
On Steady
This indicates that there could be a problem with the
Tire Pressure Monitor System. The light ashes for about
a minute and stays on steady for the remainder of the
ignition cycle. This sequence repeats with every ignition
cycle. SeeTire Pressure Monitor System on page 5-66
for more information.
Malfunction Indicator Lamp
Check Engine Light
A computer system called OBD II (On-Board
Diagnostics-Second Generation) monitors operation of
the fuel, ignition, and emission control systems. It makes
sure that emissions are at acceptable levels for the life of
the vehicle, helping to produce a cleaner environment.
This comes on briey
while starting the engine.
If it does not come on, have
the vehicle serviced by your
dealer/retailer.If the check engine light comes on and stays on, while
the engine is running, this indicates that there is an
OBD II problem and service is required.
Malfunctions often are indicated by the system before
any problem is apparent. Being aware of the light
can prevent more serious damage to the vehicle.
This system assists the service technician in correctly
diagnosing any malfunction.
Notice:If the vehicle is continually driven with this
light on, after a while, the emission controls might
not work as well, the 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 the vehicle warranty.
Notice:Modications made to the engine,
transmission, exhaust, intake, or fuel system
of the vehicle or the replacement of the original tires
with other than those of the same Tire Performance
Criteria (TPC) can affect the vehicle’s emission
controls and can cause this light to come on.
Modications to these systems could lead to
costly repairs not covered by the vehicle warranty.
This could also result in a failure to pass a required
Emission Inspection/Maintenance test. See
Accessories and Modifications on page 5-3.
3-66

If none of the above have made the light turn off, your
dealer/retailer can check the vehicle. The dealer/retailer
has the proper test equipment and diagnostic tools to
x any mechanical or electrical problems that might have
developed.
Emissions Inspection and Maintenance
Programs
Some state/provincial and local governments have or
might begin programs to inspect the emission control
equipment on the vehicle. Failure to pass this inspection
could prevent getting a vehicle registration.
Here are some things to know to help the vehicle pass
an inspection:
The vehicle will not pass this inspection if the check
engine light is on with the engine running.
To perform a check engine light bulb check with the
keyless ignition, make sure the transmitter fob is in
the passenger compartment. SeeIgnition Positions
on page 2-26. Press the bottom of the Acc. button on
the instrument panel and hold the button down forve seconds. The instrument panel, including the
check engine light, will light up and the ignition will be
on, but the engine will not start — press the bottom of
the Acc. button only briey, less than ve seconds,
the accessory power mode will be turned on, but not
the ignition. After the bulb check, press and release
the Acc. button again to turn the ignition off and avoid
draining the vehicle’s battery.
The vehicle will not pass this inspection if the OBD II
(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 the battery has recently been replaced or if the
battery has run down. The diagnostic system is
designed to evaluate critical emission control
systems during normal driving. This can take several
days of routine driving. If this has been done and the
vehicle still does not pass the inspection for lack of
OBD II system readiness, your dealer/retailer can
prepare the vehicle for inspection.
3-68

Oil Pressure Light
For vehicles with an oil
pressure light, if there
is a problem with the oil,
the light may stay on
after the engine is started,
or comes on while
driving.
This light indicates that oil is not going through the
engine quickly enough to keep it lubricated. The engine
could be low on oil or could have some other oil problem.
Have it xed right away.
The oil light could also come on in the following
situations:
The light comes on briey when the ignition is
turned on to show that it is working properly.
If it does not come on with the ignition on, there
may be a problem with the fuse or bulb. Have
it xed right away.
Sometimes when the engine is idling at a stop, a
chime sounds and the light may blink on and off.
This is normal.
{CAUTION:
Do not keep driving if the oil pressure is low.
The engine can become so hot that it catches re.
Someone could be burned. Check the oil as soon
as possible and have the vehicle serviced.
Notice:Lack of proper engine oil maintenance
can damage the engine. The repairs would not be
covered by the vehicle warranty. Always follow
the maintenance schedule in this manual for
changing engine oil.
Security Light
For information regarding
this light and the vehicle’s
security system, see
Theft-Deterrent System
on page 2-21.
3-69

Driver Information Center (DIC)
The Driver Information Center (DIC) gives you the status
of many of your vehicle’s systems. The DIC is also used
to display warning/status messages. All messages will
appear in the DIC display located at the bottom of the
instrument panel cluster, below the tachometer and
speedometer. The DIC buttons are located on the
instrument panel, to the left of the steering wheel.
The DIC comes on when the ignition is on. After a short
delay, the DIC will display the current driver and the
information that was last displayed before the engine
was turned off.
The top line of the DIC display shows the vehicle
system information and the warning/status messages.
The bottom line of the DIC display shows either the
odometer, the trip odometer A or the trip odometer B
information on the left side. Only one odometer can
appear at a time. See “Trip Information” underDIC
Operation and Displays on page 3-72for information
on changing the display to show the odometer or trip
odometer information. The bottom line of the DIC display
also shows the outside temperature on the right side
and the shift lever position indicator in the center.
SeeAutomatic Transmission Operation on page 2-30
for more information on the shift lever positions.When the sport mode is active, an S will appear next
to the shift position indicator on the center of the DIC
display. When the manual mode is active, an M will
appear on the DIC display. When the normal mode is
active, only the shift position indicator will appear. While
the Driver Shift Control (DSC) feature is active, the DIC
will change to show the selected gear. See “Driver Shift
Control (DSC)” underAutomatic Transmission Operation
on page 2-30for more information.
If a problem is detected, a warning message will appear
on the display. Be sure to take any message that
appears on the display seriously and remember that
clearing the message will only make the message
disappear, not correct the problem.
DIC Operation and Displays
The Driver Information Center (DIC) has different modes
which can be accessed by pressing the four DIC buttons
located on the instrument panel, to the left of the steering
wheel.
3-72

CHECK BRAKE FLUID
This message displays if the ignition is on to inform the
driver that the brake uid level is low. Have the brake
system serviced by your dealer/retailer as soon as
possible. SeeBrake System Warning Light on page 3-62
for more information.
CHECK GAS CAP
This message displays when the fuel cap has not been
fully tightened. Recheck the fuel cap to ensure that it
is on and tightened properly.
CHECK TIRE PRESSURE
This message displays when the pressure in one or
more of the vehicle’s tires needs to be checked. If a tire
pressure 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. See
Tires on page 5-54,Loading the Vehicle on page 4-24,
andInflation - Tire Pressure on page 5-64. The DIC also
shows the tire pressure values. SeeDIC Operation and
Displays on page 3-72. If the tire pressure is low, the low
tire pressure warning light comes on. SeeTire Pressure
Light on page 3-65.
CHECK WASHER FLUID
This symbol appears with
this message.
This message displays when the windshield washer
uid is low. Fill the windshield washer uid reservoir
as soon as possible. SeeWindshield Washer Fluid
on page 5-38for more information.
CLEAN RADAR
This message displays when the Adaptive Cruise
Control system is disabled because the radar is blocked
and cannot detect vehicles in your path. It may also
activate during heavy rain or due to road spray. To clean
the system, see “Cleaning the System” underAdaptive
Cruise Control on page 3-20.
3-82

If moving the transmitter to
different locations within
the vehicle does not help,
place the transmitter in the
center console transmitter
pocket with the buttons
facing forward and then
press the START button.
The vehicle’s battery voltage is low. The battery
voltage must be above 10 volts for the keyless
access transmitter to be detected properly.
NO FOB OFF OR RUN?
This message displays when the keyless access
transmitter is not detected inside the vehicle while you
are trying to turn the ignition off. Your vehicle may be
near a strong radio antenna signal causing the keyless
access system to be jammed. The vehicle remains in
ACCESSORY until OFF or START has been pressed or
10 minutes has expired. If you turn the ignition off and
you cannot nd the keyless access transmitter, you will
not be able to restart the vehicle. The keyless access
transmitter needs to be inside of the vehicle in order for
the vehicle to start. SeeStarting the Engine on page 2-27
for more information.
3-87

OIL PRESSURE LOW STOP ENGINE
Notice:If you drive your vehicle while the engine
oil pressure is low, severe engine damage may
occur. If a low oil pressure warning appears on
the instrument panel cluster and/or DIC, stop the
vehicle as soon as possible. Do not drive the vehicle
until the cause of the low oil pressure is corrected.
SeeEngine Oil on page 5-18for more information.
This message displays when the vehicle’s engine
oil pressure is low.
A multiple chime sounds when this message is
displayed. SeeEngine Oil on page 5-18for more
information.
Stop the vehicle immediately, as engine damage can
result from driving a vehicle with low oil pressure.
Have the vehicle serviced by your dealer/retailer as
soon as possible when this message is displayed.
PASSENGER DOOR AJAR
This symbol appears with
this message.
This message displays when the passenger side front
door is not closed completely. Make sure that the door is
closed completely.
PRESS START AND BRAKE TO START
ENGINE
This message displays when you need to press down
on the brake pedal while pressing the start button on
the electronic keyless ignition when trying to start
your vehicle. SeeStarting the Engine on page 2-27
for more information.
3-88

SERVICE RADAR CRUISE
This message displays when the Adaptive Cruise
Control system is disabled and needs service.
See your dealer/retailer.
SERVICE SIDE BLIND ZONE ALERT
SYSTEM
If your vehicle has the Side Blind Zone Alert (SBZA)
system and this message displays, both SBZA displays
will remain on indicating there is a problem with the SBZA
system. If these displays remain on after continued
driving, the system needs service. See your dealer/
retailer. See the Index in the Navigation manual for
more information.
SERVICE STABILITY SYS (System)
Your vehicle has a vehicle stability enhancement system
called StabiliTrak®. All-Wheel Drive (AWD) vehicle
with the Active Steering with Enhanced StabiliTrak
option have a stability enhancement system called
Enhanced StabiliTrak.This message displays if there has been a problem
detected with the stability system.
If this message comes on while driving, pull off the road
as soon as possible and stop carefully. Try resetting
the system by turning the ignition off then back on. If this
message still stays on or comes back on again while
driving, your vehicle needs service. Have the stability
system inspected by your dealer/retailer as soon
as possible. SeeStabiliTrak
®System on page 4-6or
Enhanced StabiliTrak®on page 4-6for more information.
For vehicles with the Active Steering with Enhanced
StabiliTrak option, in some cases when the SERVICE
STABILITY SYS message is displayed, a larger degree
of steering wheel input at low vehicle speeds and a
smaller degree of steering wheel input at higher vehicle
speeds may be required.
3-90

SERVICE STEERING SYS (System)
Your vehicle has a speed variable assist steering
system. Your All-Wheel Drive (AWD) vehicle may have
the Active Steering with Enhanced StabiliTrak option.
See “Active Steering” underSteering on page 4-12.
This message displays if a problem is detected with
the speed variable assist steering system or the Active
Steering system. When this message is displayed, you
may notice that the effort required to steer the vehicle
increases or feels heavier, but you will still be able to
steer the vehicle. SeeSteering on page 4-12for more
information. Have the steering system inspected by
your dealer/retailer as soon as possible.
If the SERVICE STEERING SYS message appears
because the Active Steering system needs service,
normal power steering is still operational. However,
compared to Active Steering, normal power steering
requires a larger degree of steering wheel input at
low vehicle speeds and a smaller degree of steering
wheel input at high vehicle speeds. The center position
of the steering wheel may be different. You may
continue to drive your vehicle with normal power
steering, but have the steering system inspected
by your dealer/retailer as soon as possible.
If the Active Steering system needs service, the system
may be operating in the Stability Secure Mode and
the STABILITY SECURE MODE message will display.
SeeEnhanced StabiliTrak
®on page 4-6.When certain steering faults are present, the vehicle
speed may be limited. If vehicle speed is limited,
the SPEED LIMITED TO XXX message will display.
See “Active Steering” underSteering on page 4-12.
SERVICE SUSPENSION SYS (System)
This message displays when the suspension system
is not operating properly. Have your vehicle serviced
by your dealer/retailer.
If your All-Wheel Drive (AWD) vehicle has the Active
Steering with Enhanced StabiliTrak option and the
suspension system needs service, the Enhanced
StabiliTrak system may be operating in the Stability
Secure Mode and the STABILITY SECURE MODE
message will display. SeeEnhanced StabiliTrak
®
on page 4-6.
SERVICE TIRE MONITOR
This message displays if a part on the Tire Pressure
Monitor System (TPMS) is not working properly. The tire
pressure light also ashes and then remains on during
the same ignition cycle. SeeTire Pressure Light on
page 3-65. Several conditions may cause this message
to appear. SeeTire Pressure Monitor Operation on
page 5-68for more information. If the warning comes on
and stays on, there may be a problem with the TPMS.
See your dealer/retailer.
3-91