Test B: The Horn Is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

Normal Operation
The smart junction box (SJB) supplies the switched and control voltage to the horn relay (part of the SJB). When the horn switch is pressed, the switch closes and ground is applied from the steering wheel switch harness through the clockspring to the horn relay through circuit SRH01 (YE/RD). The horn relay is then energized, applying voltage to the horn through circuit CRH02 (BU/WH), enabling the horn to sound.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Steering wheel switch harness
- Clockspring
- Horn switch
- SJB

B1-B4:

B4-B6: