When the ignition key is turned in the switch
H1
to the extreme position (START) - pin 50 - the winding
of the solenoid - pin 50 - of the starter motor
A20
is supplied.
This supply comes from the battery via the
line of the maxifuse CVM of
B99
and fuse F3 of the engine
compartment unit
B1
and sent to pin 76 of connector B of
M54
(start-up request signal).
However, start-up only occurs in the presence
of an enablement signal - from pin 42 of connector A of the SELESPEED
control unit
M54
. This excites start-up enablement relay T20
located in engine bay control unit
B1
: the relay - supplied
with ignition on (15/54) from a line protected by fuse F16 of
B1
- sends a power supply to pin 50 of starter motor
A20
;
The supply controlled by the ignition (15/54)
reaches pin 28 of connector A of
M54 See E7051 ROBOTIZED GEARBOX
.
Pin 30 of
A20
, the actual starter
motor, receives the voltage coming directly from the battery
A1
.
The direct current generated by the alternator
A10
(pin B+) is sent to the battery
A1
through motor
A20
.
When the alternator does not turn, and so
does not recharge the battery, an earth signal is sent from pin
D+ to the Body Computer
M1
- pin 19 of connector A: this
is connected via the CAN line to the instrument panel
E50
and manages, as described above, the switching on of the recharging
warning light on the instrument panel.