Horn Does Not Sound Twice: Cherokee

Turn ignition switch to RUN position and then OFF. Check if horn operates normally. If horn does not operate, repair horn circuit. If horn operates normally, check continuity of Black/Red wire between horn and terminal No. 12 of security alarm module. Security alarm module is located on driver's side of A/C-heater housing. If continuity exists, replace security alarm module. If no continuity exists, repair open Black/Red (Gray/Orange) wire and retest system.