2015 GMC SIERRA DENALI relay

Black plate (80,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
9-80 Driving and Operating forward that it will contact the back
of the cab in sharp turns. This is
especially important for short box
pickups. Trailer pin box extensions
and sliding fifth-wheel hitch
assemblies can help this condition.
There should be at least 15 cm (6 in)
of clearance between the top of the
pickup box and the bottom of the
trailer shelf that extends over
the box.
Make sure the hitch is attached to
the tow vehicle frame rails. Do not
use the pickup box for support.
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. If the trailer being
towed weighs up to 2 271 kg
(5,000 lb) with a factory-installed step bumper, safety chains may be
attached to the attaching points on
the bumper; otherwise, safety
chains should be attached to holes
on the trailer hitch platform. Always
leave just enough slack so the
combination can turn. Never allow
safety chains to drag on the ground.
Trailer Brakes A loaded trailer that weighs more
than 900 kg (2,000 lb) needs to have
its own brake system that is
adequate for the weight of the
trailer. Be sure to read and follow
the instructions for the trailer brakes
so they are installed, adjusted, and
maintained properly.
Do not tap into the vehicle's
hydraulic brake system.
Auxiliary Battery
The auxiliary battery provision can
be used to supply electrical power
to additional equipment that may be
added, such as a slide-in camper. If equipped, this relay will be on the
driver side of the vehicle, next to the
underhood electrical center.
Be sure to follow the proper
installation instructions included with
any electrical equipment that is
installed.
{ CautionLeaving electrical equipment on
for extended periods will drain the
battery. Always turn off electrical
equipment when not in use and
do not use equipment that
exceeds the maximum amperage
rating of 30 amps for the auxiliary
battery provision.
Trailer Wiring Harness
The vehicle is equipped with one of
the following wiring harnesses for
towing a trailer or hauling a slide-in
camper.

Black plate (42,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
10-42 Vehicle Care 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.

Black plate (44,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
10-44 Vehicle Care Micro Fuses
(2 Pin) Usage
33 Back-up Lamps
34 Engine Control
Module Ignition
35 Air Conditioning
Compressor Clutch
36 Heated Mirrors
37 Upfitter 1
38 Center
High-Mounted
Stoplamp
39 Miscellaneous
Ignition
40 Transmission
Ignition
41 Fuel Pump 2
42 Cooling Fan Clutch
43 Engine Micro Fuses
(2 Pin) Usage
44 Fuel Injectors
A, Odd
45 Fuel Injectors
B, Even
46 Oxygen Sensor B
47 Throttle Control
48 Horn
49 Fog Lamp
50 Oxygen Sensor A
51 Engine Control
Module
52 Interior Heater
53 Spare
54 Aeroshutter
55 Front Washer Micro Fuses
(3 Pin) Usage
56 Air Conditioning
Compressor/
Battery Regulated
Voltage Control
57 Air Conditioning
Compressor
Module/
Battery Pack
58 Transmission
Control Module/
Engine Control
Module
59 Headlamps
Micro
Relays Usage
60 Fuel Pump
61 Upfitter 2
62 Upfitter 3
63 Upfitter 4

Black plate (45,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Vehicle Care 10-45Micro
Relays Usage
64 Trailer Parking
Lamps
65 Run/Crank
66 Upfitter 1
67 Fuel Pump 2
68 Air Conditioning
Control
69 Starter Mini Relays Usage
70 Rear Window
Defogger
71 Engine Control
Module
Solid State
Relay Usage
72 Cooling Fan Clutch Instrument Panel Fuse
Block (Left)
The left instrument panel fuse block
access door is on the driver side
edge of the instrument panel.
Pull off the cover to access the fuse
block.

Black plate (46,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
10-46 Vehicle Care The vehicle may not be equipped
with all of the fuses, relays, and
features shown.
Number Usage
1 Accessory Power
Outlet 2
2 SEO Retained
Accessory Power
3 Universal Garage
Door Opener/Inside
Rearview Mirror
6 Body Control
Module 3
7 Body Control
Module 5
8 Driver Window
Switch/Mirror Switch
9 Spare
10 Accessory Power
Outlet Retained
Accessory Power
11 Accessory Power
Outlet Battery

Black plate (49,1)GMC 2015i Sierra Denali Owner Manual (GMNA-Localizing-U.S./Canada/
Mexico-8431500) - 2015 - crc - 6/20/14
Vehicle Care 10-49The vehicle may not be equipped
with all of the fuses, relays, and
features shown.
Number Usage
1 Accessory Power
Outlet 3
2 Accessory Power
Outlet 4
7 Body Control
Module 4
8 Body Control
Module 8
9 Rear Seat
Entertainment
10 Cargo Lamp
15 Steering Wheel
Controls
18 Radio
19 Spare
20 Sunroof
23 Airbag/Info Number Usage
26 Export/Power Take
Off/SEO Battery 1
27 Obstacle Detection/
USB Ports
28 Body Control
Module 2
32 SEO Battery 2
35 AC Inverter
36 Amplifier
37 Spare
39 Rear Sliding Window
42 Right Door Window
Motor
43 Front Blower
44 SEO
45 Body Control
Module 6
46 Body Control
Module 7
47 Passenger Seat Number Usage
50 Retained Accessory
Power/Accessory
51 Rear Sliding
Window Open
52 Rear Sliding Window
Close