check engine light CADILLAC DTS 2009 1.G User Guide

Keep a record with all parts receipts and list the mileage
and the date of any service work performed. See
Maintenance Record on page 6-15.
Adding Equipment to the Outside of
the Vehicle
Things added to the outside of the vehicle can affect the
airow around it. This can cause wind noise and can
affect fuel economy and windshield washer performance.
Check with your dealer/retailer 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.
Gasoline Octane
Use premium unleaded gasoline with a posted octane
rating of 91 or higher. You can also use regular unleaded
gasoline rated at 87 octane or higher, but the vehicle’s
acceleration could be slightly reduced, and you mightnotice a slight audible knocking noise, commonly referred
to as spark knock. If the octane is less than 87, you
might notice a heavy knocking noise when you drive. If
this occurs, use a gasoline rated at 87 octane or higher
as soon as possible. Otherwise, you could damage the
engine. If you are using gasoline rated at 87 octane or
higher and you hear heavy knocking, the engine needs
service.
Gasoline Specications
At a minimum, gasoline should meet ASTM specication
D 4814 in the United States or CAN/CGSB-3.5 or
3.511 in Canada. Some gasolines contain an
octane-enhancing additive called methylcyclopentadienyl
manganese tricarbonyl (MMT). We recommend
against the use of gasolines containing MMT. See
Additives on page 5-6for additional information.
California Fuel
If the vehicle is certied to meet California Emissions
Standards, it is designed to operate on fuels that meet
California specications. See the underhood emission
control label. If this fuel is not available in states adopting
California emissions standards, the vehicle will operate
satisfactorily on fuels meeting federal specications, but
emission control system performance might be affected.
5-5

Engine Overheating
The vehicle has several indicators to warn of engine
overheating.
There is an engine temperature warning light and/or
gage on the instrument panel cluster. SeeEngine
Coolant Temperature Warning Light on page 3-59and
Engine Coolant Temperature Gage on page 3-60.
The vehicle may also display a ENGINE OVERHEATED
IDLE ENGINE message or an ENGINE OVERHEATED
STOP ENGINE message displayed in the Driver
Information Center (DIC). SeeDIC Warnings and
Messages on page 3-73for more information. You will
also hear a chime.
You may decide not to lift the hood when this warning
appears, but instead get service help right away.
SeeRoadside Service on page 7-7.If you do decide to lift the hood, make sure the vehicle
is parked on a level surface.
Then check to see if the engine cooling fans are
running. If the engine is overheating, both fans should
be running. If they are not, do not continue to run
the engine and have the vehicle serviced.
Notice:Engine damage from running the engine
without coolant is not covered by the warranty.
Notice:If the engine catches re while driving with
no coolant, the vehicle can be badly damaged.
The costly repairs would not be covered by
the vehicle warranty. SeeOverheated Engine
Protection Operating Mode on page 5-30for
information on driving to a safe place in an
emergency.
5-28

The vehicle has an airbag system. Before attempting to
add anything electrical to the vehicle, seeServicing
Your Airbag-Equipped Vehicle on page 1-68.
Headlamp Wiring
The headlamp wiring system has four individual fuses. An
electrical overload will cause the lamps to go on and off,
or in some cases to remain 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.
A fuse powers the wiper motor. If the fuse blows, there
is an electrical problem. Be sure to have it xed.
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 and circuit
breakers. 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.
If you ever have a problem on the road and don’t have
a spare fuse, you can borrow one that has the same
amperage. Just pick some feature of the vehicle that you
can get along without — like the radio or cigarette
lighter — and use its fuse, if it is the correct amperage.
Replace it as soon as you can.
Underhood Fuse Block
The underhood fuse block is located on the passenger
side of the engine compartment. Remove the fuse cover
and secondary service cover to access the fuse block.
Notice:Spilling liquid on any electrical components
on the vehicle may damage it. Always keep the
covers on any electrical component.
5-95

Care of
Safety Belts................................................5-89
CD, MP3 .....................................................3-110
Center Console Storage...................................2-62
Center Flex Storage Unit.................................2-63
Center Seat...................................................1-10
Central Door Unlock System.............................2-11
Chains, Tire...................................................5-73
Charging System Light....................................3-56
Check
Engine Lamp..............................................3-61
Checking Things Under the Hood......................5-10
Chemical Paint Spotting...................................5-93
Child Restraints
Infants and Young Children...........................1-36
Lower Anchors and Tethers for Children..........1-43
Older Children.............................................1-33
Securing a Child Restraint in a
Rear Seat Position...................................1-49
Securing a Child Restraint in the
Center Front Seat Position........................1-51
Securing a Child Restraint in the
Right Front Seat Position..........................1-52
Systems.....................................................1-39
Where to Put the Restraint...........................1-42
Circuit Breakers..............................................5-95Cleaning
Aluminum or Chrome-Plated Wheels..............5-92
Exterior Lamps/Lenses.................................5-90
Fabric/Carpet..............................................5-87
Finish Care.................................................5-90
Instrument Panel, Vinyl, and Other
Plastic Surfaces.......................................5-88
Interior.......................................................5-86
Leather......................................................5-88
Speaker Covers..........................................5-89
Tires..........................................................5-93
Underbody Maintenance...............................5-93
Washing Your Vehicle...................................5-90
Weatherstrips
..............................................5-89
Windshield and Wiper Blades........................5-91
Wood Panels..............................................5-89
Climate Control System
Outlet Adjustment........................................3-46
Climate Control Systems
Dual ..........................................................3-40
Rear ..........................................................3-46
Clock............................................................3-39
Clock, Setting.................................................3-96
Collision Damage Repair..................................7-12
Compass...............................................1-11, 2-38
Content Theft-Deterrent....................................2-21
3

Driving (cont.)
Highway Hypnosis.......................................4-14
Hill and Mountain Roads..............................4-15
In Rain and on Wet Roads...........................4-12
Loss of Control...........................................4-10
Off-Road Recovery......................................4-10
Rocking Your Vehicle to Get it Out.................4-19
Winter........................................................4-16
Driving for Better Fuel Economy......................... 4-2
Dual Climate Control System............................3-40
E
EDR .............................................................7-17
Electrical Equipment
Add-On Equipment......................................5-94
Electrical System
Fuses and Circuit Breakers...........................5-95
Headlamp Wiring.........................................5-95
Power Windows and Other Power Options......5-95
Rear Underseat Fuse Block..........................5-98
Underhood Fuse Block.................................5-95
Windshield Wiper Fuses...............................5-95
Electronic Immobilizer
PASS-Key
®III+...........................................2-22Electronic Immobilizer Operation
PASS-Key
®III+...........................................2-23
Engine
Air Cleaner/Filter.........................................5-17
Check and Service Engine Soon Lamp...........3-61
Compartment Overview................................5-12
Coolant......................................................5-23
Coolant Heater............................................2-28
Coolant Temperature Gage...........................3-60
Coolant Temperature Warning Light................3-59
Cooling System...........................................5-22
Drive Belt Routing.......................................6-14
Exhaust.....................................................2-36
Oil .............................................................5-13
Oil Life System...........................................5-16
Overheated Protection Operating Mode...........5-30
Overheating................................................5-28
Starting......................................................2-26
Entry Lighting.................................................3-35
eporting Safety Defects to the
United States Government............................7-15
Event Data Recorders.....................................7-18
Extender, Safety Belt.......................................1-32
Exterior Lamps...............................................3-29
Exterior Lighting Battery Saver..........................3-34
5

H
Hazard Warning Flashers................................... 3-6
Head Restraints............................................... 1-2
Headlamp
Aiming .......................................................5-43
Headlamp Wiring............................................5-95
Headlamps
Bulb Replacement.......................................5-46
Daytime Running Lamps (DRL).....................3-33
Exterior Lamps............................................3-29
Flash-to-Pass..............................................3-13
High Intensity Discharge (HID) Lighting...........5-46
High/Low Beam Changer................................ 3-9
On Reminder..............................................3-33
Wiper Activated...........................................3-32
Heated
Steering Wheel............................................. 3-7
Heated Seats................................................... 1-5
Heater
Engine Coolant...........................................2-28
Highbeam On Light.........................................3-66
High-Speed Operation, Tires.............................5-59
Highway Hypnosis...........................................4-14Hill and Mountain Roads..................................4-15
Hood
Checking Things Under................................5-10
Release.....................................................5-11
Horn ............................................................... 3-6
How to Wear Safety Belts Properly...................1-17
I
Ignition Positions.............................................2-25
Inadvertent Power Battery Saver.......................3-37
Infants and Young Children, Restraints...............1-36
Ination - Tire Pressure...................................5-57
Instrument Panel
Brightness..................................................3-34
Cluster.......................................................3-51
Overview..................................................... 3-4
Introduction...................................................... 6-2
J
Jump Starting.................................................5-38
7

N
Navigation System, Privacy..............................7-19
Navigation/Radio System,
see Navigation Manual...............................3-116
Net
Convenience...............................................2-63
New Vehicle Break-In......................................2-24
O
Object Detection, Side Blind Zone Alert (SBZA) . . . 2-45
Odometer......................................................3-52
Off-Road
Recovery....................................................4-10
Oil
Engine.......................................................5-13
Engine Oil Life System.................................5-16
Pressure Light.............................................3-64
Older Children, Restraints................................1-33
Online Owner Center........................................ 7-5
OnStar, Privacy..............................................7-19
OnStar
®System, see OnStar®Manual...............2-51
Operation, Universal Home Remote System........2-55
Outlet Adjustment............................................3-46
Outlets
Accessory Power.........................................3-38Outside
Automatic Dimming Mirror.............................2-40
Convex Mirror.............................................2-41
Heated Mirrors............................................2-41
Power Foldaway Mirrors...............................2-40
Overheated Engine Protection Operating Mode....5-30
Owner Checks and Services.............................. 6-8
Owners, Canadian............................................... ii
P
Paint, Damage...............................................5-93
Parade Dimming.............................................3-35
Park
Shifting Into................................................2-33
Shifting Out of............................................2-34
Park Aid........................................................2-42
Park Tilt Mirrors..............................................2-41
Parking
Assist........................................................2-42
Over Things That Burn.................................2-35
Parking Brake................................................2-32
Passenger Airbag Status Indicator.....................3-55
Passenger Compartment Air Filter.....................3-48
Passenger Sensing System..............................1-64
Passing.........................................................4-10
PASS-Key
®III+ Electronic Immobilizer...............2-22
10