GMC 2009 Sierra 1500 Crew Cab Owner's Manual page 535

The vehicle may not use all of the fuses shown.
Fuses
1 Rear Seats
2 Rear Accessory Power Outlet
3 Steering Wheel Controls Backlight
4 Driver Door Module
Dome Lamps, Driver Side Turn
5
Signal
6 Driver Side Turn Signal, Stoplamp
Usage
Fuses
7 Instrument Panel Back Lighting
Passenger Side Turn Signal,
8
Stoplamp
Passenger Door Module,
9
Driver Unlock
10 Power Door Lock 2 (Unlock Feature)
11 Power Door Lock 2 (Lock Feature)
Stoplamps, Center-High Mounted
12
Stoplamp
13 Rear Climate Controls
14 Power Mirror
15 Body Control Module (BCM)
16 Accessory Power Outlets
17 Interior Lamps
18 Power Door Lock 1 (Unlock Feature)
19 Rear Seat Entertainment
Ultrasonic Rear Parking Assist,
20
Power Liftgate
21 Power Door Lock 1 (Lock Feature)
Usage
5-125