Tests AH
PINPOINT TEST AH: THE HORN IS INOPERATIVETest AH1-AH2:
Test AH3-AH4:
Test AH5-AH6:
Test AH7-AH8:
Test AH9-AH11:
Test AH12-AH13:
Test AH14-AH15:
Normal Operation
The horn relay B+ power and the horn relay switched power is supplied through circuit 1680 (OG/RD). The horn relay is controlled by ground circuit 460 (YE/LB) through the vehicle security module, low tire pressure monitoring system module, and the horn switches. The horn relay is grounded through the horn switches by circuit 6 (YE/LG) and to the powertrain control module (PCM), circuit 848 (DG/OG). When the horn switch is pressed, the horn relay control circuit 460 (YE/LB) is grounded. The relay is then energized causing B+ voltage to be applied to circuit 1 (DB), enabling the horns to sound.
Possible Causes
- Battery junction box (BJB) fuse 28 (20A)
- circuit 6 (YE/LG) open or shorted to ground
- circuit 460 (YE/LB) open
- circuit 848 (DG/OG) open
- circuit 1205 (BK) open
- circuit 1680 (OG/RD) open or shorted to ground
- clockspring
- horn relay
- horn
- horn switches