Test B: The Horn Is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

B1-B5:

B5 Continued:

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 SBB05 (GY/RD). The horn relay (part of the SJB) is controlled by circuit SRH01 (YE/RD) through the clockspring to the horn switch (part of the steering wheel). When the horn switch is pressed, the horn relay control circuit SRH01 (YE/RD) 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 CRH02 (BU/WH), enabling the horn to sound. Ground to the horn is supplied through circuit GD123 (BK/GY).

Possible Causes
- Circuit SRH01 (YE/RD) short to ground
- Circuit CRH02 (BU/WH) short to voltage
- Clockspring
- Horn switch (part of the steering wheel)
- SJB