GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 538

Fuses
1 Right Trailer Stop/Turn Lamp
Electronic Suspension Control,
2
Automatic Level Control Exhaust
3 Left Trailer Stop/Turn Lamp
5-128
Usage
Fuses
4 Engine Controls
Engine Control Module,
5
Throttle Control
6 Trailer Brake Controller
7 Front Washer
8 Oxygen Sensor
9 Antilock Brakes System 2
10 Trailer Back-up Lamps
11 Driver Side Low-Beam Headlamp
12 Engine Control Module (Battery)
Fuel Injectors, Ignition Coils
13
(Right Side)
Transmission Control Module
14
(Battery)
15 Vehicle Back-up Lamps
Passenger Side Low-Beam
16
Headlamp
17 Air Conditioning Compressor
18 Oxygen Sensors
19 Transmission Controls (Ignition)
Usage