Tests AO

PINPOINT TEST AO: THE HORN IS ALWAYS ON

Test AO1-AO2:

Test AO2-AO4:

Test AO4-AO7:

Test AO8:

Normal Operation
The SJB receives the horn signal through circuit 1 (DB) when the horn switch is pressed, which grounds through the speed control actuator via circuit 848 (DG/OG). The SJB then activates the horn relay through circuit 1323 (OG/RD). Power is sent to the horn through circuit 6 (YE/LG), and the ground is provided through circuit 1205 (BK).

Possible Causes
- circuit 848 (DG/OG) open
- circuit 1 (DB) short to ground
- circuit 6 (YE/LG) short to power
- circuit 1323 (OG/RD) short to ground
- horn switch
- clockspring
- horn relay
- SJB