Page 254 of 528

Black plate (68,1)Cadillac STS Owner Manual - 2011
Highbeam On Light
This light comes on when
the high-beam headlamps
are in use.
See Headlamp High/Low-Beam Changer
on page 4‑5for more information.
Fuel Gauge
The fuel gauge shows
approximately how much
fuel is in the fuel tank.
It works only when the
engine is on. An arrow on the fuel gauge indicates the side of the
vehicle the fuel door is on.
If the fuel supply gets low, the
“FUEL LEVEL LOW”
message appears on the Driver Information Center
(DIC) and a single chime sounds. See DIC Warnings
and Messages
on page 4‑76for more information.
All of the following situations are normal and do not
indicate that anything is wrong with the fuel gauge:
.At the gas station the gas pump shuts off before
the gauge reads full.
.The gauge may change when you turn, stop
quickly or accelerate quickly.
.It takes a little more or less fuel to fill the tank than
the gauge indicated. For example, the gauge may
have indicated that the tank was half full, but it
actually took a little more or less than half the
tank's capacity to fill the tank.
4-68
Page 356 of 528

Black plate (6,1)Cadillac STS Owner Manual - 2011
This vehicle has an airbag system. Before attempting
to do your own service work, seeServicing Your
Airbag-Equipped Vehicle on page 2‑70.
Keep a record with all parts receipts and list the mileage
and the date of any service work performed. See
Maintenance Record on page 7‑13.
Adding Equipment to the Outside of
the Vehicle
Things added to the outside of the vehicle can affect
the airflow around it. This can cause wind noise and
can affect fuel economy and windshield washer
performance. Check with your dealer before adding
equipment to the outside of the vehicle.
Fuel
Use of the recommended fuel is an important part
of the proper maintenance of this vehicle. To help
keep the engine clean and maintain optimum vehicle
performance, we recommend the use of gasoline
advertised as TOP TIER Detergent Gasoline.
Look for the TOP TIER label on the fuel pump to ensure
gasoline meets enhanced detergency standards
developed by auto companies. A list of marketers
providing TOP TIER Detergent Gasoline can be found
at www.toptiergas.com.
Gasoline Octane
Use regular unleaded gasoline with a posted octane
rating of 87 or higher. If the octane rating is less
than 87, an audible knocking noise, commonly referred
to as spark knock, might be heard when driving. If this
occurs, use a gasoline rated at 87 octane or higher as
soon as possible. If heavy knocking is heard when
using gasoline rated at 87 octane or higher, the engine
needs service.
6-6
Page 359 of 528

Black plate (9,1)Cadillac STS Owner Manual - 2011
Filling the Tank
{WARNING:
Fuel vapor burns violently and a fuel fire can
cause bad injuries. To help avoid injuries to you
and others, read and follow all the instructions on
the fuel pump island. Turn off the engine when
refueling. Do not smoke near fuel or when
refueling the vehicle. Do not use cellular phones.
Keep sparks, flames, and smoking materials away
from fuel. Do not leave the fuel pump unattended
when refueling the vehicle. This is against the law
in some places. Do not re-enter the vehicle while
pumping fuel. Keep children away from the fuel
pump; never let children pump fuel.
The tethered fuel cap
is located behind a
hinged fuel door on the
passenger side of the
vehicle.
To open the fuel door, push the rearward center edge in
and release and it will open.
To remove the fuel cap, turn it slowly counterclockwise.
The fuel cap has a spring in it; if the cap is released too
soon, it will spring back to the right.
6-9
Page 360 of 528

Black plate (10,1)Cadillac STS Owner Manual - 2011
While refueling, hang the tethered fuel cap from the
hook on the fuel door.
{WARNING:
Fuel can spray out on you if you open the fuel cap
too quickly. If you spill fuel and then something
ignites it, you could be badly burned. This spray
can happen if the tank is nearly full, and is more
likely in hot weather. Open the fuel cap slowly and
wait for any hiss noise to stop. Then unscrew the
cap all the way.
Be careful not to spill fuel. Do not top off or overfill the
tank, and wait a few seconds after you have finished
pumping before removing the nozzle. Clean fuel from
painted surfaces as soon as possible. See Washing
Your Vehicle on page 6‑109. When replacing the fuel cap, turn it clockwise until it
clicks. Make sure the cap is fully installed. The
diagnostic system can determine if the fuel cap has
been left off or improperly installed. This would allow
fuel to evaporate into the atmosphere. See
Malfunction
Indicator Lamp on page 4‑62.
The CHECK GAS CAP message will appear on the
Driver Information Center (DIC) display if the fuel cap is
not reinstalled properly. See DIC Warnings and
Messages
on page 4‑76for more information.
6-10
Page 361 of 528

Black plate (11,1)Cadillac STS Owner Manual - 2011
{WARNING:
If a fire starts while you are refueling, do not
remove the nozzle. Shut off the flow of fuel by
shutting off the pump or by notifying the station
attendant. Leave the area immediately.
Notice: If you need a new fuel cap, be sure to get
the right type. Your dealer can get one for you.
If you get the wrong type, it may not fit properly.
This may cause the malfunction indicator lamp to
light and may damage the fuel tank and emissions
system. See Malfunction Indicator Lamp
on
page 4‑62.
Filling a Portable Fuel Container
{WARNING:
Never fill a portable fuel container while it is in
the vehicle. Static electricity discharge from the
container can ignite the fuel vapor. You can be
badly burned and the vehicle damaged if this
occurs. To help avoid injury to you and others:
.Dispense fuel only into approved containers.
.Do not fill a container while it is inside a
vehicle, in a vehicle's trunk, pickup bed, or on
any surface other than the ground.
.Bring the fill nozzle in contact with the inside
of the fill opening before operating the nozzle.
Contact should be maintained until the filling is
complete.
.Do not smoke while pumping fuel.
.Do not use a cellular phone while
pumping fuel.
6-11
Page 469 of 528

Black plate (119,1)Cadillac STS Owner Manual - 2011
Fuses MiniUsage
V/CHKInstrument Panel Module-Voltage
Check
WPR Wipe/Wash Module Assembly
WPR SW/VICS Rain Sensor, Wiper Switch
Relays Usage
A/C CMPRSR
CLTCH Air Conditioning Compressor Clutch
ACCY Accessory, Rain Sensor, Headlamp
Washer Relay Coil, Windshield
Wiper/Washer Module
BRK
VAC PUMP Brake Vacuum Pump
FAN S/P Cooling Fan Series/Parallel
FOG LAMP Fog Lamps FRT BLWR Front Blower Motor
FUEL COOL Fuel Cooling Pump
HI BEAM High Beam Headlamp
HI FAN SPD Cooling Fan High Speed HORN Horn
Relays Usage
LO FAN SPD Cooling Fan Low Speed
LOW BEAM
W/O HID/HID Low Beam Headlamp, High Intensity
Discharge (HID)
PRK LAMP Parking Lamps, Instrument Panel
Dimming, Rear License Plate Lamps
PWR/TRN Engine Controls
RUN CRNK Heated Washer Nozzle, Air Quality,
Antilock Brake System, Climate
Control Panel, TCM, ECM, Instrument
Panel Cluster
SPARE Spare
SPARE Spare
SPARE Spare
STRTR Starter
WPR HI Windshield Wiper High Speed
Circuit
Breakers Usage
HDLP WASH
Headlamp Washer Motor
(Circuit Breaker)
6-119
Page 476 of 528
Black plate (126,1)Cadillac STS Owner Manual - 2011
FusesUsage
AIRBAG/IGNSensing and Diagnostic Monitor,
Automatic Occupant Sensor,
Passenger Supplemental Inflatable
Restraint
CNSTR/VENT Canister Vent Solenoid
SPARE Spare
FRT PDM Front Passenger Door Module, Right
Power Subwoofer
FUEL PUMP Fuel Pump
HTD STR Heated Steering WheelRF HTD/
SEAT/XM Front Passenger Heated Seat,
S-Band™
Antenna
RDO/ONSTAR Radio, OnStar
®
INT LAMP Interior Lamps
LT TRN/LDW Left Turn Signal, Lane Departure
Warning (Option)
Fuses
Usage
REAR DEFOG Rear Defogger
REAR/FOG Rear Fog Lamps (Option)
RIM Rear Integration Module
RIM /RPA
/ISRVM /CLM Rear Integration Module, Rear
Parking Aid, Inside Rearview Mirror,
Column Lock Module, Power
Sounder, Active Front Steering (AFS),
Supervisory Control Module
RUN/CRNK UHBEC Run, CRNK Relay Coil, Rear
Fog Lamp Relay Coil
S/ROOF Sun Roof Module (Option) SPARE Spare
STOP LAMPS Stop Lamps
RT TRN/SZBA Right Turn Signal, Side Blind Zone
Alert (Option)
6-126
Page 477 of 528
Black plate (127,1)Cadillac STS Owner Manual - 2011
RelaysUsage
SPARE Spare
FUEL PUMP Fuel Pump
INT LAMP Interior Lamps
REAR DEFOG Rear Defogger REAR/FOG Rear Fog Lamps (Option)
RUN/CRNK Ignition 1 SPARE Spare
STOP LAMP Stop Lamp
Circuit
Breakers Usage
WINDOW MTRS Power Window Motors Circuit Breaker
Diodes
Usage
TRUNK DIODE Trunk Release
Joint
Connector Usage
J/C Splice Pack (Blue)
6-127