2018 CADILLAC ATS warning light

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
VEHICLE CARE 283
ignition cycle until the tires are
inflated to the correct inflation
pressure. Using the DIC, tire pressure
levels can be viewed. For additional
information and details about the DIC
operation and displays seeDriver
Information Center (DIC) 0139.
The low tire pressure warning light
may come on in cool weather when
the vehicle is first started, and then
turn off as the vehicle is driven. This
could be an early indicator that the air
pressure is getting low and needs to
be inflated to the proper pressure.
A Tire and Loading Information label,
attached to your vehicle, shows the
size of the original equipment tires
and the correct inflation pressure for
the tires when they are cold. See
Vehicle Load Limits 0179, for an
example of the Tire and Loading
Information label and its location.
Also see Tire Pressure 0279.
The TPMS can warn about a low tire
pressure condition but it does not
replace normal tire maintenance. See
Tire Inspection 0285, Tire Rotation
0 285 and Tires 0272.Caution
Tire sealant materials are not all
the same. A non-approved tire
sealant could damage the TPMS
sensors. TPMS sensor damage
caused by using an incorrect tire
sealant is not covered by the
vehicle warranty. Always use only
the GM approved tire sealant
available through your dealer or
included in the vehicle.
Factory-installed Tire Inflator Kits use
a GM approved liquid tire sealant.
Using non-approved tire sealants
could damage the TPMS sensors. See
Tire Sealant and Compressor Kit 0293
for information regarding the inflator
kit materials and instructions.
TPMS Malfunction Light and
Message
The TPMS will not function properly if
one or more of the TPMS sensors are
missing or inoperable. When the
system detects a malfunction, the low
tire pressure warning light flashes for about one minute and then stays on
for the remainder of the ignition cycle.
A DIC warning message also displays.
The malfunction light and DIC
warning message come on at each
ignition cycle until the problem is
corrected. Some of the conditions that
can cause these to come on are:
.
One of the road tires has been
replaced with the spare tire. The
spare tire does not have a TPMS
sensor. The malfunction light and
DIC message should go off after
the road tire is replaced and the
sensor matching process is
performed successfully. See “TPMS
Sensor Matching Process ”later in
this section.
. The TPMS sensor matching
process was not done or not
completed successfully after
rotating the tires. The malfunction
light and the DIC message should
go off after successfully
completing the sensor matching
process. See "TPMS Sensor
Matching Process" later in this
section.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
286 VEHICLE CARE
Use this rotation pattern when
rotating the tires.
Do not include the spare tire in
the tire rotation.
Adjust the front and rear tires to
the recommended inflation
pressure on the Tire and Loading
Information label after the tires
have been rotated.
SeeTire Pressure 0279 and Vehicle
Load Limits 0179.
Reset the Tire Pressure Monitor
System. See Tire Pressure Monitor
Operation 0282. Check that all wheel nuts are
properly tightened. See
“Wheel
Nut Torque ”under Capacities and
Specifications 0337.
{Warning
Rust or dirt on a wheel, or on the
parts to which it is fastened, can
make wheel nuts become loose
after time. The wheel could come
off and cause a crash. When
changing a wheel, remove any rust
or dirt from places where the wheel
attaches to the vehicle. In an
emergency, a cloth or a paper towel
can be used; however, use a scraper
or wire brush later to remove all
rust or dirt.
Lightly coat the center of the
wheel hub with wheel bearing
grease after a wheel change or tire
rotation to prevent corrosion or
rust build-up. Do not get grease
on the flat wheel mounting
surface or on the wheel nuts or
bolts.
When It Is Time for New
Tires
Factors such as maintenance,
temperatures, driving speeds, vehicle
loading, and road conditions affect the
wear rate of the tires.
Treadwear indicators are one way to
tell when it is time for new tires.
Treadwear indicators appear when the
tires have only 1.6 mm (1/16 in) or
less of tread remaining.
See Tire Inspection 0285 and Tire
Rotation 0285.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
VEHICLE CARE 289
Warning (Continued)
the chance of a crash and serious
injury. Only use GM specific wheel
and tire systems developed for the
vehicle, and have them properly
installed by a GM certified
technician.
See Buying New Tires 0287 and
Accessories and Modifications 0238.
Uniform Tire Quality
Grading
The following information relates
to the system developed by the
United States National Highway
Traffic Safety Administration
(NHTSA), which grades tires by
treadwear, traction, and
temperature performance. This
applies only to vehicles sold in the
United States. The grades are
molded on the sidewalls of most
passenger car tires. The Uniform
Tire Quality Grading (UTQG) system does not apply to deep
tread, winter tires, compact spare
tires, tires with nominal rim
diameters of 10 to 12 inches
(25 to 30 cm), or to some
limited-production tires.
While the tires available on
General Motors passenger cars
and light trucks may vary with
respect to these grades, they must
also conform to federal safety
requirements and additional
General Motors Tire Performance
Criteria (TPC) standards.
Quality grades can be found where
applicable on the tire sidewall
between tread shoulder and
maximum section width. For
example:
Treadwear 200 Traction AA
Temperature A
All Passenger Car Tires Must
Conform to Federal Safety
Requirements In Addition To
These Grades.
Treadwear
The treadwear grade is a
comparative rating based on the
wear rate of the tire when tested
under controlled conditions on a
specified government test course.
For example, a tire graded
150 would wear one and one-half
(1½) times as well on the
government course as a tire
graded 100. The relative
performance of tires depends
upon the actual conditions of
their use, however, and may
depart significantly from the norm
due to variations in driving habits,
service practices and differences
in road characteristics and
climate.
Traction
The traction grades, from highest
to lowest, are AA, A, B, and C.
Those grades represent the tire's
ability to stop on wet pavement as
measured under controlled
conditions on specified

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
290 VEHICLE CARE
government test surfaces of
asphalt and concrete. A tire
marked C may have poor traction
performance. Warning: The
traction grade assigned to this tire
is based on straight-ahead braking
traction tests, and does not
include acceleration, cornering,
hydroplaning, or peak traction
characteristics.
Temperature
The temperature grades are A (the
highest), B, and C, representing
the tire's resistance to the
generation of heat and its ability
to dissipate heat when tested
under controlled conditions on a
specified indoor laboratory test
wheel. Sustained high temperature
can cause the material of the tire
to degenerate and reduce tire life,
and excessive temperature can
lead to sudden tire failure. The
grade C corresponds to a level of
performance which all passenger
car tires must meet under theFederal Motor Safety Standard
No. 109. Grades B and A represent
higher levels of performance on
the laboratory test wheel than the
minimum required by law.
Warning: The temperature grade
for this tire is established for a tire
that is properly inflated and not
overloaded. Excessive speed,
underinflation, or excessive
loading, either separately or in
combination, can cause heat
buildup and possible tire failure.
Wheel Alignment and Tire
Balance
The tires and wheels were aligned and
balanced at the factory to provide the
longest tire life and best overall
performance. Adjustments to wheel
alignment and tire balancing are not
necessary on a regular basis. Consider
an alignment check if there is unusual
tire wear or the vehicle is significantly
pulling to one side or the other. Some
slight pull to the left or right,
depending on the crown of the road
and/or other road surface variations such as troughs or ruts, is normal.
If the vehicle is vibrating when driving
on a smooth road, the tires and
wheels may need to be rebalanced.
See your dealer for proper diagnosis.
Wheel Replacement
Replace any wheel that is bent,
cracked, or badly rusted or corroded.
If wheel nuts keep coming loose, the
wheel, wheel bolts, and wheel nuts
should be replaced. If the wheel leaks
air, replace it. Some aluminum wheels
can be repaired. See your dealer if any
of these conditions exist.
Your dealer will know the kind of
wheel that is needed.
Each new wheel should have the same
load-carrying capacity, diameter,
width, offset, and be mounted the
same way as the one it replaces.
Replace wheels, wheel bolts, wheel
nuts, or Tire Pressure Monitor System
(TPMS) sensors with new GM original
equipment parts.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
308 VEHICLE CARE
Caution
If the other vehicle does not have a
12-volt system with a negative
ground, both vehicles can be
damaged. Only use a vehicle that
has a 12-volt system with a
negative ground for jump starting.
2. Position the two vehicles so that they are not touching.
3. Set the parking brake firmly. Vehicles with an automatic
transmission should be in
P (Park). See Shifting Into Park
0 188.
Caution
If any accessories are left on or
plugged in during the jump starting
procedure, they could be damaged.
The repairs would not be covered
by the vehicle warranty. Whenever
possible, turn off or unplug all
accessories on either vehicle when
jump starting. 4. Turn the ignition off and switch
off all lights and accessories in
both vehicles, except the hazard
warning flashers if needed.
{Warning
An electric fan can start up even
when the engine is not running and
can injure you. Keep hands,
clothing, and tools away from any
underhood electric fan.
{Warning
Using a match near a battery can
cause battery gas to explode. People
have been hurt doing this, and
some have been blinded. Use a
flashlight if you need more light.
Battery fluid contains acid that can
burn you. Do not get it on you.
If you accidentally get it in your
eyes or on your skin, flush the place
with water and get medical help
immediately.
{Warning
Fans or other moving engine parts
can injure you badly. Keep your
hands away from moving parts
once the engine is running.
5. Connect one end of the red positive (+) cable to the jump
start remote positive (+) terminal
for the discharged battery.
6. Connect the other end of the red positive (+) cable to the
positive (+) terminal of the good
battery.
7. Connect one end of the black negative (–) cable to the negative
(–) terminal of the good battery.
8. Connect the other end of the black negative (–) cable to the
remote negative (–) post for the
discharged battery.
9. Start the engine in the vehicle with the good battery and run
the engine at idle speed for at
least four minutes.

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
364 INDEX
IndexA
Accessories and Modifications . . . . . 238
Accessory Power . . . . . . . . . . . . . . . . . . . . 188
Adaptive Cruise Control . . . . . . . . . . . . 202
Add-On Electrical Equipment . . . . . . 235
Additional InformationOnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
Additional Maintenance and Care . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
Adjustments
Lumbar, Front Seats . . . . . . . . . . . . . . . . 57
Thigh Support . . . . . . . . . . . . . . . . . . . . . . 59
Air Cleaner/Filter, Engine . . . . . . . . . . 248
Air Conditioning . . . . . . . . . . . . . . .163, 168
Air Filter, Passenger Compartment . . . . . . . . . . . . . . . . . . . . . 170
Air Vents . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Airbag System Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
How Does an Airbag Restrain? . . . . . 81
Passenger Sensing System . . . . . . . . . 82
What Makes an Airbag Inflate? . . . . 80
What Will You See after anAirbag Inflates? . . . . . . . . . . . . . . . . . . . 81
When Should an Airbag Inflate? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Where Are the Airbags? . . . . . . . . . . . . 78 Airbags
Adding Equipment to the
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Passenger Status Indicator . . . . . . . 130
Readiness Light . . . . . . . . . . . . . . . . . . . 129
Servicing Airbag-Equipped Vehicles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
System Check . . . . . . . . . . . . . . . . . . . . . . . 76
Alarm Vehicle Security . . . . . . . . . . . . . . . . . . . . . 41
Alert
Lane Change . . . . . . . . . . . . . . . . . . . . . . 221
Side Blind Zone (SBZA) . . . . . . . . . . 221
All-Season Tires . . . . . . . . . . . . . . . . . . . . . 273
All-Wheel Drive . . . . . . . . . . . . . . . .193, 259
Antilock Brake System (ABS) . . . . . . 194 Warning Light . . . . . . . . . . . . . . . . . . . . 134
Appearance Care Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312
Interior . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316
Armrest
Rear Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Armrest Storage . . . . . . . . . . . . . . . . . . . . . 109
Assistance Systems for Driving . . . . 217
Assistance Systems for Parking and Backing . . . . . . . . . . . . . . . . . . . . . . . 211
Automatic Dimming Mirrors . . . . . . . . . . . . . . . . . . . 45

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
INDEX 365
Automatic (cont'd)Door Locks . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Forward Braking . . . . . . . . . . . . . . . . . . 219
Headlamp System . . . . . . . . . . . . . . . . 157
Level Control . . . . . . . . . . . . . . . . . . . . . . 199
Transmission . . . . . . . . . . . . . . . . . . . . . . 191
Transmission Fluid . . . . . . . . . . . . . . . 247
Automatic Transmission Manual Mode . . . . . . . . . . . . . . . . . . . . . 193
Shift Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259
B
BatteryExterior Lighting BatterySaver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Power Protection . . . . . . . . . . . . . . . . . . 161
Battery - North America . . . . . .258, 306
Blade Replacement, Wiper . . . . . . . . . 260
Boost Gauge . . . . . . . . . . . . . . . . . . . . . . . . . 126
Brake Parking, Electric . . . . . . . . . . . . . . . . . . 194
System Warning Light . . . . . . . . . . . . 133
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Antilock . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Assist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 257
Braking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174 Braking (cont'd)
Automatic Forward . . . . . . . . . . . . . . . 219
Break-In, New Vehicle . . . . . . . . . . . . . . 183
Bulb Replacement Back-up Lamps . . . . . . . . . . . . . . . . . . . 263
Headlamp Aiming . . . . . . . . . . . . . . . . 262
Headlamps . . . . . . . . . . . . . . . . . . . . . . . . 263
License Plate Lamps . . . . . . . . . . . . . . 264
Buying New Tires . . . . . . . . . . . . . . . . . . . 287
C
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 115
California Perchlorate Materials
Requirements . . . . . . . . . . . . . . . . . . . 238
California Proposition 65 Warning . . . . . . . . . . . . .237, 258, 306, Back Cover
Canadian Vehicle Owners . . . . . . . . . . . . . 2
Capacities and Specifications . . . . . . 337
Carbon Monoxide
Engine Exhaust . . . . . . . . . . . . . . . . . . . 190
Trunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Winter Driving . . . . . . . . . . . . . . . . . . . . 178
Cargo Management System . . . . . . . . . . . . . 111
Tie-Downs . . . . . . . . . . . . . . . . . . . . . . . . . 110
Caution, Danger, and Warning . . . . . . . . 2 Center Console Storage . . . . . . . . . . . . . 109
Chains, Tire . . . . . . . . . . . . . . . . . . . . . . . . . 291
Charging
Wireless . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Charging System Light . . . . . . . . . . . . . 131
Check Engine Light (Malfunction
Indicator) . . . . . . . . . . . . . . . . . . . . . . . . 131
Child Restraints Infants and Young Children . . . . . . . . 90
Lower Anchors and Tethers forChildren . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Older Children . . . . . . . . . . . . . . . . . . . . . . 89
Securing . . . . . . . . . . . . . . . . . . . . . . 102, 104
Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Cigarette Lighter . . . . . . . . . . . . . . . . . . . . 119
Circuit Breakers . . . . . . . . . . . . . . . . . . . . . 265
Cleaning
Exterior Care . . . . . . . . . . . . . . . . . . . . . . 312
Interior Care . . . . . . . . . . . . . . . . . . . . . . 316
Climate Control Systems
Dual Automatic . . . . . . . . . . . . . . . . . . . 163
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Cluster, Instrument . . . . . . . . . . . . . . . . . 121
Collision Damage Repair . . . . . . . . . . . 346
Compact Spare Tire . . . . . . . . . . . . . . . . . 305

Cadillac XTS Owner Manual (GMNA-Localizing-U.S./Canada-12032610) -
2019 - crc - 8/22/18
366 INDEX
CompartmentsStorage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Compass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Compressor Kit, Tire Sealant . . . . . . . 293
Connected Services Connections . . . . . . . . . . . . . . . . . . . . . . . 361
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . 363
Navigation . . . . . . . . . . . . . . . . . . . . . . . . . 360
Connections Connected Services . . . . . . . . . . . . . . . 361
Control
Traction and ElectronicStability . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Control of a Vehicle . . . . . . . . . . . . . . . . 174
Convenience Net . . . . . . . . . . . . . . . . . . . . 111
Convex Mirrors . . . . . . . . . . . . . . . . . . . . . . 44
Coolant Engine Temperature Gauge . . . . . . 128
Engine Temperature WarningLight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Cooling . . . . . . . . . . . . . . . . . . . . . . . . .163, 168
Cooling System . . . . . . . . . . . . . . . . . . . . . 250
Cornering Lamps . . . . . . . . . . . . . . . . . . . 159
Courtesy Lamps . . . . . . . . . . . . . . . . . . . . . 159
Courtesy Transportation
Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
Cover Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243 Cruise Control . . . . . . . . . . . . . . . . . . . . . . . 199
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Cruise Control, Adaptive . . . . . . . . . . . 202
Customer Assistance . . . . . . . . . . . . . . . 341 Offices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341
Text Telephone (TTY) Users . . . . . 341
Customer Information
Publications OrderingInformation . . . . . . . . . . . . . . . . . . . . . . 348
Customer Satisfaction Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 339
D
Damage Repair, Collision . . . . . . . . . . . 346
Danger, Warning, and Caution . . . . . . . . 2
Data CollectionInfotainment System . . . . . . . . . . . . . 351
OnStar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Data Recorders, Event . . . . . . . . . . . . . . 350
Daytime Running Lamps (DRL) . . . 157
Defensive Driving . . . . . . . . . . . . . . . . . . . 174
Delayed Locking . . . . . . . . . . . . . . . . . . . . . 37
Diagnostics Connected Services . . . . . . . . . . . . . . . 363
Distracted Driving . . . . . . . . . . . . . . . . . . 173
Dome Lamps . . . . . . . . . . . . . . . . . . . . . . . . 159
Door Ajar Light . . . . . . . . . . . . . . . . . . . . . . . . . 139 Door (cont'd)
Delayed Locking . . . . . . . . . . . . . . . . . . . . 37
Locks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Power Locks . . . . . . . . . . . . . . . . . . . . . . . . . 37
Rear Seat Pass-Through . . . . . . . . . . . . 68
Drive Belt Routing, Engine . . . . . . . . . 338
Drive Systems All-Wheel Drive . . . . . . . . . . . . . . 193, 259
Driver Assistance Systems . . . . . . . . . 209
Driver Information
Center (DIC) . . . . . . . . . . . . . . . . . . . . . . . 139
Driving Assistance Systems . . . . . . . . . . . . . . . 217
Characteristics andTowing Tips . . . . . . . . . . . . . . . . . . . . . 230
Defensive . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Drunk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
For Better Fuel Economy . . . . . . . . . . . 25
Hill and Mountain Roads . . . . . . . . 177
If the Vehicle is Stuck . . . . . . . . . . . . 179
Loss of Control . . . . . . . . . . . . . . . . . . . . 176
Off-Road Recovery . . . . . . . . . . . . . . . . 176
Vehicle Load Limits . . . . . . . . . . . . . . 179
Wet Roads . . . . . . . . . . . . . . . . . . . . . . . . . 176
Winter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
Dual Automatic Climate Control System . . . . . . . . . . . . . . . . . . . . 163