Service manual

Body and Accessories Horns 8-51
2006 LSSV Service Manual Supplement
Description and Operation
Horn with Blackout (B/O) Control
Circuit Operation
Voltage is applied at all times to the horn relay through
the 15A horn fuse in the underhood fuse block. The
blackout (B/O) service drive switch is used to control the
horn relay. Power is applied through OG (circuit 40) to
the blackout (B/O) service drive switch, which is
normally a closed switch. When the horn switch is
depressed, the horn switch contacts close, providing a
ground to the coil of the horn relay. When the coil of the
relay is grounded, the relay energizes and the contacts
close, applying battery voltage directly to the LH and RH
horn. Because the horns are grounded at ground
(G100) the horns will sound as long as the horn switch
is depressed.
The blackout (B/O) service drive switch is used to
disable the horn relay when placed in the blackout (B/O)
mode. When the blackout (B/O) service drive switch is
in the ON position, power to the horn relay is disrupted
leaving the horns inoperative.