Test A: The Horn Is Inoperative

PINPOINT TEST A: THE HORN IS INOPERATIVE

A1-A3:

A4-A5:

A6-A9:

A9-A10:

A10-A11:

Normal Operation
The horn relay B+ voltage and the horn relay switched voltage is supplied through circuit 1680 (OG/RD). The horn relay is controlled by ground circuit 460 (YE/LB) through the vehicle security module, the low tire pressure monitoring system (TPMS) module, and the horn switch. The horn relay is grounded through the horn switch by circuit 6 (YE/LG) and to the PCM, by circuit 848 (DG/OG). When the horn switch is pressed, the horn relay control circuit 460 (YE/LB) is grounded. The relay is then energized causing B+ voltage to be applied to circuit 1 (DB), enabling the horns to sound.

Possible Causes
- circuit 1 (DB) open
- circuit 6 (YE/LG) open
- circuit 460 (YE/LB) open
- circuit 848 (DG/OG) open
- circuit 1205 (BK) open
- circuit 1680 (OG/RD) open or short to ground
- clockspring
- horn relay
- horn
- horn switch