Test B: The Horn Is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

B1-B4:

Normal Operation
The horn relay control voltage and the horn relay switched voltage circuits are supplied by the smart junction box (SJB) fuse 13 (15A) through circuit 1118 (RD). The horn relay (part of the SJB) is controlled by circuit 1 (DB) through the clockspring to the horn switch (part of the steering wheel). When the horn switch is pressed, the horn relay control circuit 1 (DB) is grounded through the steering wheel switch harness (part of the steering wheel). The horn relay is then energized causing voltage to be applied to circuit 6 (YE/LG), enabling the horn to sound. Ground to the horn is supplied through circuit 57 (BK).

Possible Causes
- circuit 1 (DB) short to ground
- circuit 6 (YE/LG) short to voltage
- clockspring
- horn switch (part of the steering wheel)
- SJB