The system for the horns is supplied through the horn relay
R2, located in the junction unit B1 from the direct
line from the battery through the fuse F13 - always for B1 - and the maxifuse J/B1 for B5.
The coil for the relay R2 is energized with
an earth signal when one of the switches on the steering wheel is
closed; on versions with Air Bags, they are connected to the steering column
switch unit
H5 by the clock spring.
The relay
R2 thereby supplies
the high tone horns P10 and the lone tone horns P11.