Chevrolet TrailBlazer I facelift (2005-2009) Horn circuit

"F" NOTE HORN "A" NOTE HORN BLK WIRE BLK/YEL WIRE DK GRN WIRE HORN ASSEMBLY (LOWER LEFT FRONT OF RADIATOR SUPPORT) HORN FUSE 21 HORN RELAY 40 HORN SWITCH HOT AT ALL TIMES TURN SIGNAL/ MULTIFUNCTION SWITCH UNDERHOOD FUSE BLOCK (ON LEFT SIDE OF ENGINE COMPT)