Test A: The Horn Is Inoperative

PINPOINT TEST A: THE HORN IS INOPERATIVE

Normal Operation
The horn relay control and switched voltage is supplied by the bussed electrical center (BEC) through fuse 46 (25A). The 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 B1217 (Horn Relay Coil Circuit Failure) - is a continuous and on-demand DTC that sets when the SJB detects a short to voltage on circuit 1323 (OG/RD) or circuit 1 (DB).

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Horn relay
- Horn switch (part of the steering wheel)
- Horns
- Clockspring
- BEC
- SJB

A1-A3:

A4-A5:

A6-A7:

A8-A9:

A9-A11:

A11-A12:

A13-A14: