Test A: The Horn Is Inoperative

PINPOINT TEST A: THE HORN IS INOPERATIVE

A1-A3:

A4-A6:

A6-A8:

A9-A11:

A12-A13:

Normal Operation
The horn relay control voltage and switched voltage circuit is supplied by the battery junction box (BJB) through circuit 1680 (OG/RD). The horn relay is controlled through circuit 1 (DB) by the horn switch and through the lighting control module (LCM). When the horn switch is pressed, the horn relay control circuit 1 (DB) is grounded through the clockspring and circuit 460 (YE/LB) or when the LCM has enabled the anti-theft system, the LCM supplies a ground through the horn relay control circuit 1 (DB). The horn relay is then energized causing voltage to be applied to circuit 6 (YE/LG), enabling the horn to sound. Ground to the horn is supplied through circuit 57 (BK).

Possible Causes
- fuse
- circuit 1 (DB) open
- circuit 6 (YE/LG) open
- circuit 57 (BK) open
- circuit 460 (YE/LB) open
- circuit 1680 (OG/RD) open
- horn
- horn relay
- steering wheel switch harness
- clockspring
- LCM
- horn switch (part of the driver air bag module)