HORN Horn Wiring Diagram for Porsche 928 S4 1990 List of elements for Horn Wiring Diagram for Porsche 928 S4 1990:(in engine compartment near air conditioning condenser) g101Central electric (in passenger's footwell on safety wall)Contact unitD13Fuse 24 7.5aHot at all timesN15Sliding contact unitSteering wheel (w/horn contact)Two- tone horns relayTwo-tone hornWipe/ wash switch (w/horn contact)HORNCOOLING FANDEFOGGERSRADIOPOWER SEATSPOWER DOOR LOCKSMEMORY SYSTEMSTRUNK, TAILGATE, FUEL DOORPOWER MIRRORSSTARTING/CHARGINGPOWER WINDOWSWIPER/WASHER