Test A: The Horn Is Inoperative
PINPOINT TEST A: THE HORN IS INOPERATIVENormal Operation
The battery junction box (BJB) supplies voltage to the horn relay (part of the smart junction box [SJB]) through circuit SBB02 (YE/RD). When the horn switch (part of the steering wheel) is pressed, the switch closes and ground is applied from the steering wheel switch harness through the clockspring to the horn relay through circuit CRH02 (BU/WH). The horn relay is then energized, applying voltage to the horn through circuit CBP14 (VT/OG), enabling the horn to sound. Ground for the horn is supplied through circuit GD120 (BK/GN).
- DTC B1217 (Horn Relay Coil Circuit Failure) - is a continuous and on-demand DTC that sets when the SJB detects an open on the horn relay output circuit.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Steering wheel switch harness
- Horn
- Clockspring
- Horn switch (part of the steering wheel)
- SJB