GMC 2008 Sierra 1500 Pickup Owner's Manual page 426

Fuses
34 Sunroof
Key Ignition System,
35
Theft Deterrent System
36 Windshield Wiper
37 SEO B2 Upfitter Usage (Battery)
38 Electric Adjustable Pedals
39 Climate Controls (Battery)
40 Airbag System (Ignition)
41 Amplifier
42 Audio System
Miscellaneous (Ignition),
43
Cruise Control
44 Not Used
45 Airbag System (Battery)
46 Instrument Panel Cluster
5-114
Usage Fuses
47 Power Take-Off
Auxiliary Climate Control (Ignition),
48
Compass-Temperature Mirror
Center High-Mounted Stoplamp
49
(CHMSL)
50 Rear Defogger
51 Heated Mirrors
52 SEO B1 Upfitter Usage (Battery)
Cigarette Lighter,
53
Auxiliary Power Outlet
Automatic Level Control Compressor
54
Relay, SEO Upfitter Usage
55 Climate Controls (Ignition)
Engine Control Module,
56
Secondary Fuel Pump (Ignition)
Usage