The system for the horns is supplied through the horn relay T3
of the engine compartment control unit
B1
from the direct
line from the battery through the fuse F10 located in
B1
.
The relay coil is energized by an earth
signal produced when one of the steering switches is closed; these
switches are connected via the the wiring to the clock spring
D47.
The relay supplies the horns
P05.