AUX GMC SIERRA 2009 Owner's Guide

Heavy-Duty Trailer Wiring Harness
Package
For vehicles equipped with heavy duty trailering, the
harness is connected to a bracket on the hitch platform.
The seven-wire harness contains the following trailer
circuits:
Yellow: Left Stop/Turn Signal
Dark Green: Right Stop/Turn Signal
Brown: Taillamps
White: Ground
Light Green: Back-up Lamps
Red: Battery Feed*
Dark Blue: Trailer Brake**The fuses for these two circuits are installed in
the underhood electrical center, but the wires are
not connected. They should be connected by your
dealer/retailer or a qualied service center. The fuse
and wire for the ITBC is factory installed and connected
if the vehicle is equipped with an ITBC. The fuse for
the battery feed is not required if the vehicle has
an auxiliary battery. If the vehicle does not have an
auxiliary battery, have your dealer/retailer or authorized
service center install the required fuse.
If charging a remote (non-vehicle) battery, press the
tow/haul mode button located at the end of the shift lever.
This will boost the vehicle system voltage and properly
charge the battery. If the trailer is too light for tow/haul
mode, turn on the headlamps as a second way to boost
the vehicle system and charge the battery.
4-82

Electric Brake Control Wiring
Provisions
These wiring provisions are included with the vehicle as
part of the trailer wiring package. These provisions are
for an electric brake controller. The instrument panel
contains blunt cut wires behind the steering column for
the trailer brake controller. The harness contains the
following wires:
Dark Blue: Brake Signal to Trailer Connector
Red/Black: Battery
Light Blue/White: Brake Switch
White: Ground
It should be installed by your dealer/retailer or a
qualied service center.
If the vehicle is equipped with an ITBC, the blunt cuts
exist, but are not connected further in the harness.
If an aftermarket trailer brake controller is installed,
the ITBC must be disconnected. Do not power
both ITBC and aftermarket controllers to control
the trailer brakes at the same time.
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 the vehicle has this
provision, this relay will be located on the drivers side of
the vehicle, next to the underhood electrical center.Be sure to follow the proper installation instructions
that are included with any electrical equipment that
is installed.
Notice:Leaving 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 for the auxiliary battery provision.
Trailer Recommendations
Subtract the hitch loads from the Cargo Weight Rating
(CWR). CWR is the maximum weight of the load the
vehicle can carry. It does not include the weight of the
people inside, but you can gure about 150 lbs. (68 kg)
for each passenger. The total cargo load must not be
more than the vehicles CWR.
Weigh the vehicle with the trailer attached, so
the GVWR or GAWR are not exceeded. If using a
weight-distributing hitch, weigh the vehicle without
the spring bars in place.
The best performance is obtained by correctly spreading
out the weight of the load and choosing the correct
hitch and trailer brakes.
For more information seeTowing a Trailer on page 4-51.
4-84

Fuses Usage
48 Auxiliary Climate Control (Ignition)
49Center High-Mounted Stoplamp
(CHMSL)
50 Rear Defogger
51 Heated Mirrors
52 SEO B1 Uptter Usage (Battery)
53Cigarette Lighter, Auxiliary Power
Outlet
54 SEO Uptter Usage
55 Climate Controls (Ignition)
56Engine Control Module, Secondary
Fuel Pump (Ignition)
J-Case Fuses Usage
57 Cooling Fan 1
58 Not Used
59 Heavy Duty Antilock Brake System
60 Cooling Fan 2
61 Antilock Brake System 1
62 Starter
63 Stud 2 (Trailer Brakes)
64 Left Bussed Electrical Center 1
65 Not Used
66 Heated Windshield Washer System
J-Case Fuses Usage
67 Four-Wheel Drive System
68Stud 1 (Trailer Connector Battery
Power) (Optional - 40A Fuse
Required)
69 Mid-Bussed Electrical Center 1
70 Climate Control Blower
71 Not Used
72 Left Bussed Electrical Center 2
Relays Usage
FAN HI Cooling Fan High Speed
FAN LO Cooling Fan Low Speed
FAN CNTRL Cooling Fan Control
HDLP LO/HID Low-Beam Headlamp
FOG LAMP Front Fog Lamps
A/C CMPRSR Air Conditioning Compressor
STRTR Starter
PWR/TRN Powertrain
FUEL PMP Fuel Pump
PRK LAMP Parking Lamps
REAR DEFOG Rear Defogger
RUN/CRANK Switched Power
5-128

Audio System (cont.)
Setting the Clock.........................................3-86
Theft-Deterrent Feature...............................3-140
XM™ Satellite Radio Antenna System...........3-142
Audio System(s).............................................3-88
Automatic Headlamp System............................3-18
Automatic Transmission
Fluid..................................................5-21, 5-24
Operation...................................................2-28
Auxiliary Roof Mounted Lamp Switch.................3-19
B
Battery..........................................................5-43
Electric Power Management..........................3-21
Run-Down Protection...................................3-22
Bluetooth
®....................................................3-119
Brake
Emergencies................................................ 4-6
Brake Fluid....................................................5-40
Brakes..........................................................5-40
System Warning Light..................................3-42
Braking........................................................... 4-4
Braking in Emergencies..................................... 4-6
Break-In, New Vehicle.....................................2-22
Bulb Replacement...........................................5-58
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp......................................5-59
Halogen Bulbs............................................5-58Bulb Replacement (cont.)
Headlamp Aiming........................................5-55
Headlamps.................................................5-58
License Plate Lamps....................................5-63
Pickup Box Identication and Fender
Marker Lamps.........................................5-60
Replacement Bulbs......................................5-63
Taillamps, Turn Signal, Stoplamps and
Back-up Lamps........................................5-61
Buying New Tires...........................................5-84
C
Calibration.....................................................3-63
California Fuel.................................................. 5-7
California Perchlorate Materials
Requirements............................................... 5-5
California Proposition 65 Warning....................... 5-5
Canadian Owners................................................ ii
Capacities and Specications..........................5-129
Carbon Monoxide...........................2-13, 2-55, 4-28
Care of
Safety Belts..............................................5-116
Cargo Lamp...................................................3-21
Cargo Management System.............................2-84
CD, MP3 ............................................3-108, 3-113
Center Console Storage Area...........................2-82
Center High-Mounted Stoplamp (CHMSL)
and Cargo Lamp.........................................5-59
2

I
Ignition Positions.............................................2-22
Infants and Young Children, Restraints...............1-41
Ination - Tire Pressure...................................5-73
Instrument Panel
Brightness..................................................3-20
Cluster.......................................................3-34
Overview...............................................3-4, 3-6
Storage Area..............................................2-81
J
Jump Starting.................................................5-44
K
Keyless Entry System....................................... 2-4
Keys............................................................... 2-3
L
Labeling, Tire Sidewall.....................................5-66
Lamp
Malfunction Indicator....................................3-45
Lamps
Auxiliary Roof Mounted Lamp........................3-19
Cargo........................................................3-21
Dome ........................................................3-20Lamps (cont.)
Dome Lamp Override...................................3-20
Puddle.......................................................3-19
Reading.....................................................3-21
Lap Belt........................................................1-36
Lap-Shoulder Belt...........................................1-30
LATCH System for Child Restraints...................1-49
Latches, Seatback..........................................1-13
License Plate Lamps.......................................5-63
Light
Airbag Off..................................................3-38
Airbag Readiness........................................3-37
Antilock Brake System (ABS) Warning............3-43
Brake System Warning.................................3-42
Charging System.........................................3-41
Cruise Control.............................................3-50
Fog Lamp ..................................................3-50
Four-Wheel-Drive.........................................3-51
Highbeam On.............................................3-50
Low Fuel Warning.......................................3-52
Oil Pressure...............................................3-49
Passenger Airbag Status Indicator..................3-40
Safety Belt Reminders..................................3-36
Security.....................................................3-50
StabiliTrak®Indicator....................................3-44
Tire Pressure..............................................3-45
Tow/Haul Mode...........................................3-51
Lighting
Entry.........................................................3-20
Exit...........................................................3-20
7