The headlamp alignment device
H15
is supplied at pin 2 - with the dipped headlamps on - by a line
coming from the steering column switch unit
H5
: in involves
a supply controlled by the ignition (INT/A) for the line protected
by the fuse
F5
for the junction unit
B1
. The supply
is maintained even when the main beam headlamps are switched on, through
the special relay
J45
(
See E2011 DIPPED HEADLAMPS
).
Pin 4 of device
H15
is earthed,
whilst pin 1 sends the signal to adjust the motors
N30
(left)
and
N31
(right), through a resistance divider which alters
the output voltage according to which of the four positions has
been selected. Motors
N30
and
N31
contain a transducer
that establishes actual motor travel on the basis of the voltage
of an adjustment signal received by pin 2 from device
H15
whilst pin 1 is earthed.
Motors
N30
and
N31
are supplied,
at pin 3, by the same line for the circuit for the dipped headlamps
and the line protected by the fuse
F5
for the junction unit
B1
(
See E2011 DIPPED HEADLAMPS
).
The device therefore only works when the
dipped headlamps are switched on.