Test B: The Horn Is Always On

PINPOINT TEST B: THE HORN IS ALWAYS ON

B1-B4:

B5:

Normal Operation
The smart junction box (SJB) monitors the horn switch input by sending a voltage reference signal through circuit 1 (DB) to the clockspring. The clockspring routes the signal to the horn switch (part of the air bag module). When the horn pad is pressed, the switch closes and the voltage signal is routed back through the clockspring to ground through circuit 1205 (BK). When the SJB detects the horn pad is pressed, the SJB energizes an internal relay which routes voltage to circuit 6 (YE/LG). Circuit 6 (YE/LG) carries the voltage to the horns. Ground for the horns is supplied through circuit 1205 (BK).

Possible Causes
- circuit 1 (DB) short to ground
- circuit 6 (YE/LG) short to voltage
- clockspring
- driver air bag module
- SJB