wiring GMC SIERRA DENALI 2017 User Guide

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
348 Driving and Operating Other ITBC-Related DIC Messages
In addition to displaying TRAILER
GAIN and OUTPUT through the
DIC, trailer connection and ITBC
system status are displayed on
the DIC.
TRAILER CONNECTED: This
message will briefly display when a
trailer with electric brakes is first
connected to the vehicle. This
message will automatically turn off
in about 10 seconds. This message
can be acknowledged before it
automatically turns off.
CHECK TRAILER WIRING: This
message will display if:
.
The ITBC system first
determines connection to a
trailer with electric brakes and
then the trailer harness becomes
disconnected from the vehicle.
If the disconnect occurs while
the vehicle is stationary, this
message will automatically turn
off in about 30 seconds. This
message will also turn off if it is
acknowledged or if the trailer
harness is reconnected. If the disconnect occurs while
the vehicle is moving, this
message will continue until the
ignition is turned off. This
message will also turn off if it is
acknowledged or if the trailer
harness is reconnected.
.
There is an electrical fault in the
wiring to the trailer brakes. This
message will continue as long
as there is an electrical fault in
the trailer wiring. This message
will also turn off if it is
acknowledged.
To determine if the electrical fault is
on the vehicle side or trailer side of
the trailer wiring harness
connection:
1. Disconnect the trailer wiring
harness from the vehicle.
2. Turn the ignition off.
3. Wait 10 seconds, then turn the
ignition back to RUN.
4. If the CHECK TRAILER
WIRING message reappears,
the electrical fault is on the
vehicle side. If the CHECK TRAILER
WIRING message only
reappears when connecting the
trailer wiring harness to the
vehicle, the electrical fault is on
the trailer side.
SERVICE TRAILER BRAKE
SYSTEM: This message will display
when there is a problem with the
ITBC system. If this message
continues over multiple ignition
cycles, there is a problem with the
ITBC system. Have the vehicle
serviced.
If either the CHECK TRAILER
WIRING or SERVICE TRAILER
BRAKE SYSTEM message displays
while driving, the ITBC system may
not be fully functional or may not
function at all. When traffic
conditions allow, carefully pull the
vehicle over to the side of the road
and turn the ignition off. Check the
wiring connection to the trailer and
turn the ignition back on. If either of
these messages continues, either
the vehicle or trailer needs service.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
350 Driving and Operating
Conversions and
Add-Ons Add-On Electrical
Equipment
{ WarningThe Data Link Connector (DLC) is
used for vehicle service and
Emission Inspection/Maintenance
testing. See Malfunction Indicator
Lamp (Check Engine Light) 0 144
. A device connected to the DLC
— such as an aftermarket fleet or
driver-behavior tracking device —
may interfere with vehicle
systems. This could affect vehicle
operation and cause a crash.
Such devices may also access
information stored in the vehicle ’ s
systems. CautionSome electrical equipment can
damage the vehicle or cause
components to not work and
would not be covered by the
vehicle warranty. Always check
with your dealer before adding
electrical equipment.
Add-on equipment can drain the
vehicle's 12-volt battery, even if the
vehicle is not operating.
The vehicle has an airbag system.
Before attempting to add anything
electrical to the vehicle, see
Servicing the Airbag-Equipped
Vehicle 0 85 and Adding Equipment
to the Airbag-Equipped Vehicle
0 86 .
For information on wiring auxiliary
switches, see www.gmupfitter.com
or contact your dealer. Adding a Snow Plow or
Similar Equipment CautionDo not exceed 72 km/h (45 mph)
with a snow plow mounted to the
vehicle. The vehicle could
overheat and be damaged.
Before installing a snow plow on the
vehicle, follow these guidelines:
CautionIf the vehicle does not have the
snow plow prep package, RPO
VYU, adding a plow can damage
the vehicle, and the repairs would
not be covered by the vehicle
warranty. Unless the vehicle was
built to carry a snow plow, do not
add one to the vehicle. If the
vehicle has RPO VYU, then the
payload the vehicle can carry will
be reduced when a snow plow is
installed. The vehicle can be
(Continued)

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
Driving and Operating 353For example, adding a 318 kg
(700 lb) snow plow actually adds
more than 318 kg (700 lb) to the
front axle. Using the formula, if the
snow plow is 122 cm (4 ft) in front of
the front axle and the wheelbase is
305 cm (10 ft), then:
W = 318 kg (700 lb)
A = 122 cm (4 ft)
W.B. = 305 cm (10 ft)
(W x (A + W.B.)/W.B. =
(318 x (122 + 305))/305 = 445 kg
(980 lb)
This means if the front axle reserve
capacity is more than 445 kg
(980 lb), the snow plow could be
added without exceeding the
front GAWR.
Heavier equipment can be added on
the front of the vehicle if less cargo
or fewer passengers are carried,
or by positioning cargo toward the
rear. This reduces the load on the
front. However, the front GAWR,
rear GAWR, and Gross Vehicle
Weight Rating (GVWR) must never
be exceeded. { WarningOn some vehicles that have
certain front mounted equipment,
such as a snow plow, it may be
possible to load the front axle to
the front Gross Axle Weight
Rating (GAWR) but not have
enough weight on the rear axle to
have proper braking performance.
If the brakes cannot work
properly, the vehice could crash.
Always follow the snow plow
manufacturer or installer's
recommendation for rear ballast
to ensure a proper front and rear
weight distribution ratio.
Maintaining a proper front and
rear weight distribution ratio is
necessary to provide proper
braking performance.
Total vehicle reserve capacity is the
difference between the GVWR and
the weight of the truck with full fuel
and passengers. It is the amount of
weight that can be added to the
vehicle before reaching the GVWR. Reserve capacity numbers are
intended as a guide when selecting
the amount of equipment or cargo
the truck can carry. If unsure of the
vehicle's front, rear, or total weight,
go to a weigh station and weigh the
vehicle. Your dealer can also help
with this.
The total vehicle reserve capacity
for the vehicle is in the lower right
corner of the Certification/Tire label
as shown previously.
See your dealer for additional
advice and information about using
a snow plow on the vehicle. Also,
see Vehicle Load Limits 0 265 .
Emergency Roof Lamp
Provisions Vehicles with the RPO VYU snow
plow prep package also have an
emergency roof lamp provision
package, RPO TRW. Wiring for the
emergency roof lamp is provided
above the overhead console. See
Auxiliary Roof-Mounted Lamp 0 183
for switch location.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
Vehicle Care 355
Vehicle Care General Information General Information . . . . . . . . . . 356
California Proposition
65 Warning . . . . . . . . . . . . . . . . . 357
California Perchlorate
Materials Requirements . . . . . 357
Accessories and
Modifications . . . . . . . . . . . . . . . . 357
Vehicle Checks Doing Your Own
Service Work . . . . . . . . . . . . . . . 358
Hood . . . . . . . . . . . . . . . . . . . . . . . . . 358
Engine Compartment
Overview . . . . . . . . . . . . . . . . . . . . 359
Engine Oil . . . . . . . . . . . . . . . . . . . . 364
Engine Oil Life System . . . . . . . 367
Automatic Transmission Fluid
(6 Speed Transmission) . . . . . 368
Automatic Transmission Fluid
(8 Speed Transmission) . . . . . 371
Engine Air Cleaner/Filter . . . . . . 371
Cooling System . . . . . . . . . . . . . . 372
Engine Coolant . . . . . . . . . . . . . . . 374
Engine Overheating . . . . . . . . . . 376
Overheated Engine Protection
Operating Mode . . . . . . . . . . . . . 378
Engine Fan . . . . . . . . . . . . . . . . . . . 378 Power Steering Fluid (1500
Series) . . . . . . . . . . . . . . . . . . . . . . 379
Power Steering Fluid (2500/
3500 Series) . . . . . . . . . . . . . . . . 379
Washer Fluid . . . . . . . . . . . . . . . . . 380
Brakes . . . . . . . . . . . . . . . . . . . . . . . 381
Brake Fluid . . . . . . . . . . . . . . . . . . . 381
Battery - North America . . . . . . 383
Four-Wheel Drive . . . . . . . . . . . . . 383
Front Axle . . . . . . . . . . . . . . . . . . . . 384
Rear Axle . . . . . . . . . . . . . . . . . . . . 385
Noise Control System . . . . . . . . 386
Starter Switch Check . . . . . . . . . 387
Automatic Transmission Shift
Lock Control Function
Check . . . . . . . . . . . . . . . . . . . . . . . 387
Ignition Transmission Lock
Check . . . . . . . . . . . . . . . . . . . . . . . 388
Park Brake and P (Park)
Mechanism Check . . . . . . . . . . 388
Wiper Blade Replacement . . . . 388
Glass Replacement . . . . . . . . . . 389
Headlamp Aiming Headlamp Aiming . . . . . . . . . . . . 389
Bulb Replacement
Bulb Replacement . . . . . . . . . . . . 389
Halogen Bulbs . . . . . . . . . . . . . . . . 389
High Intensity Discharge (HID)
Lighting . . . . . . . . . . . . . . . . . . . . . 390 LED Lighting . . . . . . . . . . . . . . . . . 390
Taillamps, Turn Signal,
Stoplamps, and Back-Up
Lamps . . . . . . . . . . . . . . . . . . . . . . 390
Center High-Mounted
Stoplamp (CHMSL) and
Cargo Lamp . . . . . . . . . . . . . . . . . 391
Replacement Bulbs . . . . . . . . . . . 392
Electrical System High Voltage Devices and
Wiring . . . . . . . . . . . . . . . . . . . . . . . 392
Electrical System Overload . . . 392
Fuses . . . . . . . . . . . . . . . . . . . . . . . . 393
Engine Compartment Fuse
Block . . . . . . . . . . . . . . . . . . . . . . . . 393
Instrument Panel Fuse Block
(Right) . . . . . . . . . . . . . . . . . . . . . . 396
Instrument Panel Fuse
Block (Left) . . . . . . . . . . . . . . . . . 398
Wheels and Tires Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 400
All-Season Tires . . . . . . . . . . . . . . 401
Winter Tires . . . . . . . . . . . . . . . . . . 401
Low-Profile Tires . . . . . . . . . . . . . 402
All-Terrain Tires . . . . . . . . . . . . . . . 402
Tire Sidewall Labeling . . . . . . . . 402
Tire Designations . . . . . . . . . . . . . 405
Tire Terminology and
Definitions . . . . . . . . . . . . . . . . . . 406

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
392 Vehicle Care To replace one of these bulbs:
1. Remove the two screws and lift
off the lamp assembly.
2. Turn the bulb socket
counterclockwise and pull it
straight out.
3. Pull the bulb straight out from
the socket.
Replacement Bulbs For replacement bulbs, contact your
dealer. Electrical System High Voltage Devices and
Wiring For an eAssist vehicle, see the
Silverado/Sierra eAssist
supplement.
Electrical System
Overload The vehicle has fuses to protect
against an electrical system
overload. Fuses also protect power
devices in the vehicle.
Replace a bad fuse with a new one
of the identical size and rating.
If there is a problem on the road and
a fuse needs to be replaced, there
are some spare fuses and a fuse
puller in the left instrument panel
fuse block. The same amperage
fuse can also be borrowed. Choose
some feature of the vehicle that is
not needed to use and replace it as
soon as possible. Headlamp Wiring An electrical overload may cause
the lamps to go on and off, or in
some cases to remain off. Have the
headlamp wiring checked right away
if the lamps go on and off or
remain off.
Windshield Wipers If the wiper motor overheats due to
heavy snow or ice, the windshield
wipers will stop until the motor cools
and will then restart.
Although the circuit is protected
from electrical overload, overload
due to heavy snow or ice may
cause wiper linkage damage.
Always clear ice and heavy snow
from the windshield before using the
windshield wipers.
If the overload is caused by an
electrical problem and not snow or
ice, be sure to get it fixed.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
Vehicle Care 393
Fuses The wiring circuits in the vehicle are
protected from short circuits by
fuses. This greatly reduces the
chance of fires caused by electrical
problems.
{ DangerFuses and circuit breakers are
marked with their ampere rating.
Do not exceed the
specified amperage rating when
replacing fuses and circuit
breakers. Use of an oversized
fuse or circuit breaker can result
in a vehicle fire. You and others
could be seriously injured or
killed.
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.
Engine Compartment
Fuse Block If the vehicle has a diesel engine,
see the Duramax diesel
supplement.
The engine compartment fuse block
is in the engine compartment, on
the driver side of the vehicle.
Lift the cover to access the fuse
block. CautionSpilling liquid on any electrical
component on the vehicle may
damage it. Always keep the
covers on any electrical
component.
A fuse puller is available in the left
instrument panel fuse block.
The vehicle may not be equipped
with all of the fuses, relays, and
features shown.

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
Index 503General Information
Service and Maintenance . . . . . 454
Towing . . . . . . . . . . . . . . . . . . . . . . . . 320
Vehicle Care . . . . . . . . . . . . . . . . . . 356
Glass Replacement . . . . . . . . . . . . . 389
Glove Box . . . . . . . . . . . . . . . . . . . . . . 119
GM Mobility Reimbursement
Program . . . . . . . . . . . . . . . . . . . . . . . 478
H Halogen Bulbs . . . . . . . . . . . . . . . . . . 389
Hazard Warning Flashers . . . . . . . 182
Head Restraints . . . . . . . . . . . . . . . . . 56
Headlamps
Aiming . . . . . . . . . . . . . . . . . . . . . . . . 389
Automatic . . . . . . . . . . . . . . . . . . . . . 181
Bulb Replacement . . . . . . . . . . . . 389
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . 181
Flash-to-Pass . . . . . . . . . . . . . . . . . 181
High Intensity Discharge
(HID) Lighting . . . . . . . . . . . . . . . 390
High-Beam On Light . . . . . . . . . . 151
High/Low Beam Changer . . . . . 180
Lamps On Reminder . . . . . . . . . 151
Heated
Steering Wheel . . . . . . . . . . . . . . . 125
Heated and Ventilated Front
Seats . . . . . . . . . . . . . . . . . . . . . . . . . . 62 Heated Mirrors . . . . . . . . . . . . . . . . . . . 48
Heater
Engine Coolant . . . . . . . . . . . . . . . 278
Heating . . . . . . . . . . . . . . .243, 245, 246
High Voltage Devices and
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 392
High-Beam On Light . . . . . . . . . . . . 151
High-Speed Operation . . . . . . . . . . 410
Hill and Mountain Roads . . . . . . . . 262
Hill Descent Control (HDC) . . . . . 301
Hill Descent Control Light . . . . . . . 147
Hill Start Assist (HSA) . . . . . . . . . . 298
Home Page . . . . . . . . . . . . . . . . 194, 196
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
How to Wear Safety Belts
Properly . . . . . . . . . . . . . . . . . . . . . . . . 66
HVAC . . . . . . . . . . . . . . . . .243, 245, 246
I Idle System
Fast . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Ignition Positions . . . . . . . . . . . . . . . 274
Ignition Transmission Lock
Check . . . . . . . . . . . . . . . . . . . . . . . . . 388
Immobilizer . . . . . . . . . . . . . . . . . . . . . . 45
Indicator
Vehicle Ahead . . . . . . . . . . . . . . . . 148 Infants and Young Children,
Restraints . . . . . . . . . . . . . . . . . . . . . . 89
Infotainment . . . . . . . . . . . . . . . . . . . . 188
Infotainment System . . . . . . . . . . . . 487
Instrument Cluster . . . . . . . . . . . . . . 132
Instrument Panel
Storage Area . . . . . . . . . . . . . . . . . .119
Interior Rearview Mirrors . . . . . . . . . 50
Introduction . . . . . . . . . . . . . . . . . . . . . . . 2
J Jack
Auxiliary . . . . . . . . . . . . . . . . . . . . . . 214
Jump Starting - North
America . . . . . . . . . . . . . . . . . . . . . . . 435
K Key and Lock Messages . . . . . . . . 160
Keyless Entry
Remote (RKE) System . . . . . . . . . 36
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
L Labeling, Tire Sidewall . . . . . . . . . . 402
Lamps
Auxiliary Roof
Mounted Lamp . . . . . . . . . . . . . . 183
Cargo . . . . . . . . . . . . . . . . . . . . . . . . . 184
Daytime Running (DRL) . . . . . . 181
Dome . . . . . . . . . . . . . . . . . . . . . . . . . 185

GMC Sierra/Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-9955992) - 2017 - crc - 4/18/17
510 Index Vehicle (cont'd)
Towing . . . . . . . . . . . . . . . . . . . . . . . . 439
Vehicle Ahead Indicator . . . . . . . . 148
Vehicle Care
Tire Pressure . . . . . . . . . . . . . . . . . 408
Vehicle Data Recording and
Privacy . . . . . . . . . . . . . . . . . . . . . . . . 485
Ventilation, Air . . . . . . . . . . . . . . . . . . 250
Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Voice Recognition . . . . . . . . . . . . . . 216
Voltage Devices and Wiring . . . . 392
Voltmeter Gauge . . . . . . . . . . . . . . . 139
W Warning
Brake System Light . . . . . . . . . . . 145
Caution and Danger . . . . . . . . . . . . . 3
Lane Departure (LDW) . . . . . . . 312
Warning Lights, Gauges, and
Indicators . . . . . . . . . . . . . . . . . . . . . 131
Warnings
Hazard Flashers . . . . . . . . . . . . . . 182
Washer Fluid . . . . . . . . . . . . . . . . . . . 380
Messages . . . . . . . . . . . . . . . . . . . . 167
Wheels
Alignment and Tire Balance . . 421
Different Size . . . . . . . . . . . . . . . . . 419
Replacement . . . . . . . . . . . . . . . . . 421 When It Is Time for New
Tires . . . . . . . . . . . . . . . . . . . . . . . . . . 417
Where to Put the Restraint . . . . . . 93
Wi-Fi . . . . . . . . . . . . . . . . . . . . . . . . . . . 491
Windows . . . . . . . . . . . . . . . . . . . . . . . . 51
Manual . . . . . . . . . . . . . . . . . . . . . . . . . 51
Power . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Windshield
Wiper/Washer . . . . . . . . . . . . . . . . 126
Winter
Driving . . . . . . . . . . . . . . . . . . . . . . . . 263
Winter Tires . . . . . . . . . . . . . . . . . . . . 401
Wiper Blade Replacement . . . . . . 388
Wireless Charging . . . . . . . . . . . . . . 130
Wiring, High Voltage Devices . . . 392