On newer cars there are usually two, one under the hood someplace and one in the cabin. The one in the glove compartment is probably the cabin one, look around for a box under the hood with a cover that clips or screws on, possibly with a visible wiring harness coming out of it. There may also be another in the cabin if the one you saw just had a few fuses in it, check under the dash both sides.
If you have an owners manual, it will tell you.