HORN, Horn Wiring Diagram for GMC Suburban R1500 1990, List of elements for Horn Wiring Diagram for GMC Suburban R1500 1990:, Cigarette lighter, Convenience center (behind left side of i/p), Fuse block, Horn relay, Horn switch, Horn/dm fuse 20a, Hot at all times, Left horn (left front of radiator support), Right horn (right front of radiator support), Steering column switches, To, , , HORN, POWER DOOR LOCKS, DEFOGGERS, COOLING FAN, POWER MIRRORS, STARTING/CHARGING, POWER WINDOWS, RADIO, WIPER/WASHER, ,