Test B: The Horn Is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

B1-B3:

B3-B5:

B5-B6:

Normal Operation
The battery junction box (BJB) supplies the switched and control voltage to the horn relay (part of the smart junction box [SJB]) through circuit SBB23 (WH/RD). When the horn switches (part of the steering wheel) are pressed, the switches are grounded to the steering wheel and the clockspring to the instrument panel cross-car beam. Ground is then supplied to the horn relay through circuit CRH02 (BU/WH), energizing the horn relay. The horn relay then sends voltage to the horn through circuit CBP05 (YE), enabling the horn to sound.

Possible Causes
- Circuit CBP05 (YE) short to voltage
- Circuit CRH02 (BU/WH) short to ground
- Clockspring
- Steering wheel switch harness
- Horn switches (part of the steering wheel)
- SJB