The CODE control unit
M20
is supplied
at pin 3 by the battery from the line for the maxifuse CENTR of
B5
and the 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
C10
.
The line leading from pin 6 is a serial
line leading to engine management unit
M10
(pin 3), which
is responsible for identifying the key and exchanging codes. On
the 2.4 JTD version, this connection takes place at pin 11 of engine
control unit
M10
.
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
via
a 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 (INT/A) 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.