CODE control unit
M20
is supplied at pin 3 from the battery
through maxifuse CENTR of
B5
, through a line protected by
fuse
F20
of junction unit
B1
.
An ignition-operated power supply (INT/A)
reaches pin 8 from a line protected by fuse
F16
of junction
unit
B1
.
Pin 4 is earthed.
The line leading from pin 6 is a serial
line leading to engine management unit
M10
, which is responsible
for identifying the key and exchanging codes.
The control unit is equipped with a self-diagnostic
unit that may be used by connecting the unit to connector
R10
:
this receives signals from pin 5 of control unit
M20
through the
tester line.
The self-diagnostic system also generates
a signal sent to the CODE fault warning light, located in instrument
panel
E50
, pin 4 of connector C, while pin 15 of connector
A supplies an ignition-operated power supply via fuse
F1
of junction unit
B1
.
A second control unit connector is connected
via two leads to the aerial, fitted coaxially to the ignition key,
in order to detect key insertion and rotation.