GMC 2009 Sierra - Manual (Page 424)

Underhood Fuse Block
The underhood fuse block is located in the engine
compartment, on the driver side of the vehicle.
Lift the cover to access the fuse block.
Notice: Spilling liquid on any electrical components
on your vehicle may damage it. Always keep the
covers on any electrical component.
To remove fuses, hold the end of the fuse between
your thumb and index finger and pull straight out.
Fuses Usage
1 Right Trailer Stop/Turn Lamp
2
Electronic Suspension Control,
Automatic Level Control Exhaust
3 Left Trailer Stop/Turn Lamp
4 Engine Controls
5-112