GMC 2011 Sierra Owner's Manual page 477

Fuses Usage
51 Heated Mirrors
SEO B1 Upfitter
52
Usage (Battery)
Cigarette Lighter,
53 Auxiliary Power
Outlet
SEO Upfitter
54
Usage
Climate Controls
55
(Ignition)
Engine Control
Module, Secondary
56
Fuel Pump
(Ignition)
J-Case Usage
Fuses
57 Cooling Fan 1
58 Not Used
Heavy Duty
59 Antilock Brake
System
J-Case Usage
Fuses
60 Cooling Fan 2
Antilock Brake
61
System 1
62 Starter
Stud 2
63
(Trailer Brakes)
Left Bussed
64
Electrical Center 1
65 Not Used
Heated Windshield
66
Washer System
67 Transfer Case
Stud 1 (Trailer
Connector
68 Battery Power)
(Optional - 40A
Fuse Required)
Mid-Bussed
69
Electrical Center 1
Climate Control
70
Blower
I n f o r ma t i o n P r o v i d e d b y :
Vehicle Care
J-Case Usage
Fuses
71 Not Used
Left Bussed
72
Electrical Center 2
Relays Usage
Cooling Fan High
FAN HI
Speed
Cooling Fan Low
FAN LO
Speed
Cooling Fan
FAN CNTRL
Control
HDLP Low-Beam
LO/HID Headlamp
FOG LAMP Front Fog Lamps
A/C Air Conditioning
CMPRSR Compressor
STRTR Starter
PWR/TRN Powertrain
FUEL PMP Fuel Pump
PRK LAMP Parking Lamps
10-53