You have two horns, one in each corner pocket at the front and they toot at different pitches to combine into that rather downscale sound they produce to keep us safe from harm. Often, one or both of the wires attached to one or the other of these units comes loose leaving only the one horn blaring rather weakly. If both wires are securely attached, then it usually is a loose ground wire since the power travels to the horn and then uses the xj body as the complete circuit, thereby requiring a ground to the body to allow it to work. If none of the above, then one of your horns has been stolen or is deceased.
96 w/ 5spd, 4.10s w/ lsd, Bastard Packs, armor/ rack, BFGs & JK Blacks