The cruise control fuse for a 2003 Chevrolet Trailblazer is located in the fuse box under the hood. The fuse box is located on the passenger side of the engine compartment, near the battery. The fuse for the cruise control is labeled "CRUISE."
If the cruise control is not working, it may be because the fuse is blown. To replace the fuse, simply remove the old fuse and insert a new one of the same amperage. The amperage rating for the cruise control fuse is 10 amps.