Lexus IS I (1999-2005) Horn circuit

COMBINATION SWITCH ENGINE ROOM 2 R/B (ON RIGHT REAR OF ENGINE COMPARTMENT) GRN WIRE GRN/BLK WIRE GRN/WHT WIRE HORN HORN RELAY HORN SWITCH LEFT HORN PASSENGER SIDE J/B (BEHIND LOWER RIGHT END OF DASH) RIGHT HORN THEFT DETERRENT ECU (BEHIND LEFT END OF DASH)