2009 CADILLAC STS wiring

Servicing Your Airbag-Equipped
Vehicle
Airbags affect how the vehicle should be serviced.
There are parts of the airbag system in several places
around the vehicle. Your dealer/retailer and the
service manual have information about servicing the
vehicle and the airbag system. To purchase a service
manual, seeService Publications Ordering Information
on page 7-15.
{CAUTION:
For up to 10 seconds after the ignition is turned off
and the battery is disconnected, an airbag can still
inate during improper service. You can be injured
if you are close to an airbag when it inates. Avoid
yellow connectors. They are probably part of the
airbag system. Be sure to follow proper service
procedures, and make sure the person performing
work for you is qualied to do so.
Adding Equipment to Your
Airbag-Equipped Vehicle
Q:Is there anything I might add to or change
about the vehicle that could keep the airbags
from working properly?
A:Yes. If you add things that change your vehicle’s
frame, bumper system, height, front end or side
sheet metal, they may keep the airbag system from
working properly. Changing or moving any parts
of the front seats, safety belts, the airbag sensing
and diagnostic module, steering wheel, instrument
panel, roof-rail airbag modules, ceiling headliner
or pillar garnish trim, overhead console, front
sensors, side impact sensors, or airbag wiring
can affect the operation of the airbag system.
1-64

In addition, your vehicle has a passenger sensing
system for the right front passenger’s position, which
includes sensors that are part of the passenger’s
seat. The passenger sensing system may not
operate properly if the original seat trim is replaced
with non-GM covers, upholstery or trim, or with GM
covers, upholstery or trim designed for a different
vehicle. Any object, such as an aftermarket seat
heater or a comfort enhancing pad or device,
installed under or on top of the seat fabric, could also
interfere with the operation of the passenger sensing
system. This could either prevent proper deployment
of the passenger airbag(s) or prevent the passenger
sensing system from properly turning off the
passenger airbag(s). SeePassenger Sensing
System on page 1-59.
If you have any questions about this, you should
contact Customer Assistance before you modify
your vehicle. The phone numbers and addresses
for Customer Assistance are in Step Two of
the Customer Satisfaction Procedure in this manual.
SeeCustomer Satisfaction Procedure on page 7-2.Q:Because I have a disability, I have to get my
vehicle modied. How can I nd out whether this
will affect my airbag system?
A:If you have questions, call Customer Assistance.
The phone numbers and addresses for Customer
Assistance are in Step Two of the Customer
Satisfaction Procedure in this manual. See
Customer Satisfaction Procedure on page 7-2.
In addition, your dealer/retailer and the service manual
have information about the location of the airbag
sensors, sensing and diagnostic module and airbag
wiring.
1-65

Passenger Safety Belt Reminder Light
Several seconds after the engine is started,
a chime sounds for several seconds to remind
the front passenger to buckle their safety belt.
This only occurs if the passenger airbag is enabled.
SeePassenger Sensing System on page 1-59for more
information. The passenger safety belt light, located
on the instrument panel, comes on and stays on for
several seconds and then ashes for several more.
This chime and light are
repeated if the passenger
remains unbuckled and
the vehicle is in motion.
If the passenger safety belt is buckled, neither the
chime nor the light comes on.
Airbag Readiness Light
The system checks the airbag’s electrical system for
possible malfunctions. If the light stays on it indicates
there is an electrical problem. The system check includes
the airbag sensor, the pretensioners, the airbag modules,
the wiring and the crash sensing and diagnostic module.
For more information on the airbag system, seeAirbag
System on page 1-51.
The airbag readiness light
ashes for a few seconds
when the engine is
started. If the light does
not come on then, have
it xed immediately.
3-58

Total Weight on the Vehicle’s Tires
Be sure the vehicle’s tires are inated to the upper limit
for cold tires. These numbers can be found on the
Certication label or seeLoading the Vehicle on
page 4-24. Make sure not to go over the GVW limit for
the vehicle, or the GAWR, including the weight of
the trailer tongue.
Hitches
It is important to have the correct hitch equipment.
Crosswinds, large trucks going by and rough roads
are a few reasons why the right hitch is needed.
The rear bumper on the vehicle is not intended for
hitches. Do not attach rental hitches or other
bumper-type hitches to it. Use only a frame-mounted
hitch that does not attach to the bumper.
Will any holes be made in the body of the vehicle
when the trailer hitch is installed? If so, be sure to
seal the holes when the hitch is removed. If they are
not sealed, deadly carbon monoxide (CO) from the
engine’s exhaust can get into the vehicle. See
Engine Exhaust on page 2-36. Sealing the holes will
also prevent dirt and water from entering the vehicle.
Safety Chains
Always attach chains between the vehicle and the
trailer. Cross the safety chains under the tongue of
the trailer to help prevent the tongue from contacting
the road if it becomes separated from the hitch.
Instructions about safety chains may be provided by
the hitch manufacturer or by the trailer manufacturer.
Follow the manufacturer’s recommendation for attaching
safety chains and do not attach them to the bumper.
Always leave just enough slack so the rig can turn.
Never allow safety chains to drag on the ground.
Trailer Brakes
Does the trailer have its own brakes? Be sure to read
and follow the instructions for the trailer brakes so
they are installed, adjusted and maintained properly.
Because the vehicle has StabiliTrak
®, do not try to tap
into the vehicle’s hydraulic brake system. If you do,
both brake systems will not work well, or at all.
Trailer Wiring Harness
All of the electrical circuits required for the trailer lighting
system can be accessed at the driver side rear lamp
connector. This connector is located under the carpet
on the rear corner of the trunk compartment.
4-35

Tire Inspection and Rotation...........................5-71
When It Is Time for New Tires.......................5-73
Buying New Tires.........................................5-74
Different Size Tires and Wheels......................5-76
Uniform Tire Quality Grading..........................5-77
Wheel Alignment and Tire Balance..................5-79
Wheel Replacement......................................5-79
Tire Chains..................................................5-81
Lifting the Vehicle (STS-V).............................5-82
If a Tire Goes Flat........................................5-84
Tire Sealant and Compressor Kit
(Without Selector Switch)............................5-87
Tire Sealant and Compressor Kit
(With Selector Switch)................................5-96
Tire Sealant and Compressor Kit Storage.......5-104
Changing a Flat Tire...................................5-104
Removing the Spare Tire and Tools..............5-106
Removing the Flat Tire and Installing
the Spare Tire.........................................5-107
Storing a Flat or Spare Tire and Tools...........5-112
Compact Spare Tire....................................5-114
Appearance Care..........................................5-115
Interior Cleaning.........................................5-115
Fabric/Carpet..............................................5-116
Leather......................................................5-117
Instrument Panel, Vinyl, and Other
Plastic Surfaces.......................................5-117Wood Panels..............................................5-117
Speaker Covers..........................................5-118
Care of Safety Belts....................................5-118
Weatherstrips.............................................5-118
Washing Your Vehicle..................................5-118
Cleaning Exterior Lamps/Lenses....................5-119
Finish Care................................................5-119
Windshield and Wiper Blades.......................5-120
Aluminum or Chrome-Plated Wheels
and Trim................................................5-120
Tires.........................................................5-121
Sheet Metal Damage...................................5-121
Finish Damage...........................................5-121
Underbody Maintenance...............................5-121
Chemical Paint Spotting...............................5-122
Vehicle Identication.....................................5-122
Vehicle Identication Number (VIN)................5-122
Service Parts Identication Label...................5-122
Electrical System..........................................5-123
Add-On Electrical Equipment.........................5-123
Headlamp Wiring........................................5-123
Windshield Wiper Fuses...............................5-123
Power Windows and Other Power Options......5-123
Fuses and Circuit Breakers..........................5-123
Underhood Fuse Block................................5-124
Rear Underseat Fuse Block..........................5-128
Capacities and Specications........................5-134
Section 5 Service and Appearance Care
5-2

Electrical System
Add-On Electrical Equipment
Notice:Do not add anything electrical to the
vehicle unless you check with your dealer/retailer
rst. Some electrical equipment can damage
the vehicle and the damage would not be covered
by the vehicle’s warranty. Some add-on electrical
equipment can keep other components from
working as they should.
Add-on equipment can drain the vehicle battery, even if
the vehicle is not operating.
The vehicle has an airbag system. Before attempting to
add anything electrical to the vehicle, seeServicing
Your Airbag-Equipped Vehicle on page 1-64.
Headlamp Wiring
The headlamp wiring is protected by fuses in the fuse
block. An electrical overload will cause the lamps to turn
off. If this happens, have the headlamp wiring checked
right away.
Windshield Wiper Fuses
The windshield wiper motor is protected by an internal
circuit breaker. If the wiper motor overheats due to
heavy snow, the wipers will stop until the motor cools
and will then restart.
Power Windows and Other Power
Options
Circuit breakers in the fuse block protect the power
windows and other power accessories. When the current
load is too heavy, the circuit breaker opens and closes,
protecting the circuit until the problem is xed or
goes away.
Fuses and Circuit Breakers
The wiring circuits in the vehicle are protected from
short circuits by a combination of fuses, circuit breakers
and fusible thermal links. This greatly reduces the
chance of res caused by electrical problems.
Look at the silver-colored band inside the fuse. If the
band is broken or melted, replace the fuse. Be sure you
replace a bad fuse with a new one of the identical
size and rating.
Fuses of the same amperage can be temporarily
borrowed from another fuse location, if a fuse goes out.
Replace the fuse as soon as you can.
5-123

Customer Assistance Information
Courtesy Transportation................................7-10
Customer Assistance for Text
Telephone (TTY) Users............................... 7-6
Customer Assistance Offices........................... 7-6
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-7
Reporting Safety Defects to
General Motors........................................7-15
Reporting Safety Defects to the
Canadian Government..............................7-15
Reporting Safety Defects to the
United States Government.........................7-14
Roadside Service.......................................... 7-7
Service Publications Ordering Information........7-15
D
Daytime Running Lamp...................................3-36
Defensive Driving............................................. 4-2
Disc, MP3....................................................3-111
Doing Your Own Service Work........................... 5-4
Door
Locks........................................................2-13
Power Door Locks.......................................2-13
Programmable Automatic Door Locks.............2-14
Rear Door Security Locks.............................2-14Driver Information Center (DIC).........................3-72
DIC Operation and Displays..........................3-72
DIC Warnings and Messages........................3-79
Other Messages..........................................3-96
Driving
At Night.....................................................4-17
Before a Long Trip......................................4-19
Defensive..................................................... 4-2
Drunken....................................................... 4-2
Highway Hypnosis.......................................4-19
Hill and Mountain Roads..............................4-20
In Rain and on Wet Roads...........................4-18
Rocking Your Vehicle to Get it Out.................4-24
Winter........................................................4-21
Dual Climate Control System............................3-48
E
EDR .............................................................7-16
Electrical System
Add-On Equipment.....................................5-113
Fuses and Circuit Breakers.........................5-113
Headlamp Wiring.......................................5-113
Power Windows and Other Power
Options.................................................5-113
Rear Underseat Fuse Block.........................5-118
Underhood Fuse Block...............................5-114
4

G
Gage
Engine Coolant Temperature.........................3-65
Fuel..........................................................3-71
Speedometer..............................................3-57
Tachometer.................................................3-57
Garage Door Opener.......................................2-53
Gasoline
Octane........................................................ 5-5
Specications............................................... 5-6
Glove Box.....................................................2-60
GM Mobility Reimbursement Program.................. 7-7
H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-5
Headlamp
Aiming .......................................................5-50
Headlamp Wiring...........................................5-113
Headlamps....................................................3-32
Bulb Replacement.......................................5-51
Daytime Running Lamp................................3-36
Flash-to-Pass..............................................3-13
Halogen Bulbs............................................5-51
High Intensity Discharge (HID) Lighting...........5-51
High/Low Beam Changer................................ 3-9Headlamps (cont.)
On Reminder..............................................3-36
Washer......................................................3-16
Wiper Activated...........................................3-36
Head-Up Display (HUD)...................................3-43
Heated Seats................................................... 1-3
Heated Steering Wheel..................................... 3-7
Heater...........................................................3-48
Engine Coolant...........................................2-29
Highbeam On Light.........................................3-70
High-Speed Operation, Tires.............................5-65
Highway Hypnosis...........................................4-19
Hill and Mountain Roads..................................4-20
Hood
Checking Things Under................................5-10
Release.....................................................5-11
Horn ............................................................... 3-6
How to Wear Safety Belts Properly...................1-12
I
Ignition Positions.............................................2-26
Immobilizer....................................................2-24
Immobilizer Operation......................................2-24
Inadvertent Power Battery Saver.......................3-42
Infants and Young Children, Restraints...............1-31
Ination - Tire Pressure...................................5-64
Inator Kit, Tire...............................................5-87
6