Test B: The Horn is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

Test B1-B5:

Test B6:

Normal Operation
When the horn switch is pressed, the horn relay control circuit 1 (DB) is grounded through circuit 848 (DG/OG) to the PCM. The relay is then energized causing B+ voltage to be applied to circuit 6 (YE/LG), enabling the horns to sound. The horn relay B+ power voltage and the horn relay switched power voltage is supplied from the central junction box (CJB) fuse 26 (20A). The vehicle security module also provides a ground for the horn relay through circuit 1 (DB).

Possible Causes
- circuit 6 (YE/LG) short to voltage
- CJB
- clockspring
- horn relay
- horn switch
- vehicle security module