Test B: The Horn Is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

B1-B3:

B3-B7:

B7-B9:

Normal Operation
The horn relay control and switched voltage is supplied by the bussed electrical center (BEC) through circuit 2037 (RD). The smart junction box (SJB) receives the horn signal through circuit 1 (DB) from the horn switch (part of the steering wheel). When the horn switch is pressed, ground is supplied through the clockspring to the vehicle harness through circuit 1205 (BK). The SJB then activates the horn relay through circuit 1323 (OG/RD). Voltage is then sent to the horn through circuit 6 (YE/LG), enabling the horns to sound. Ground is provided to the horns through circuit 1205 (BK).

DTC B1897 - sets when a short to ground is detected on circuit 1 (DB).

Possible Causes
- Circuit 1 (DB) short to ground
- Circuit 6 (YE/LG) short to voltage
- Circuit 1323 (OG/RD) short to ground
- Horn switch (part of the steering wheel) detected on circuit 1 (DB).
- Clockspring
- Horn relay
- BEC
- SJB