Pinpoint Test A: The Horn Is Inoperative

Horn

Pinpoint Test A: The Horn Is Inoperative

Refer to Wiring Diagram Set 44, Horn/Cigar Lighter for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) supplies the switched and control voltage to the horn relay (part of the SJB). When the driver air bag is pressed against the steering wheel, ground is supplied to the horn relay coil through circuit CRH02 (BU/WH), energizing the horn relay. The horn relay then provides voltage to the horn through circuit SRH01 (YE/RD), enabling the horn to sound. Ground for the horn is supplied through circuit GD123 (BK/GY).

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- Horn
- Clockspring
- Steering wheel harness
- SJB



PINPOINT TEST A: THE HORN IS INOPERATIVE

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1-A4:

A4-A7:

A7-A8: