GMC Sierra 2008 Owner's Manual page 518

Fuses
1 Right Trailer Stop/Turn Lamp
Electronic Suspension Control,
2
Automatic Level Control Exhaust
3 Left Trailer Stop/Turn Lamp
4 Engine Controls
Engine Control Module,
5
Throttle Control
6 Trailer Brake Controller
7 Front Washer
5-126
Usage
Fuses
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)
20 Fuel Pump
21 Fuel System Control Module
22 Not Used
23 Not Used
Fuel Injectors, Ignition Coils
24
(Left Side)
Usage