2 IGNITION/STARTER SWITCH/CHARGING CIRCUIT
IGNITION CIRCUIT
If ignition/starter switch C539 is turned
(contact 1 is connected to pin 6), the
“accessories” relay (G178) will be activated.
Voltage is now applied through fuse E037,
switch C539 and wire 1130 to contact 85 of
relay G178. As a result of the activation of
relay G178 a connection is made between
contacts 30 and 87 and a voltage is applied
through fuse E052 and wire 1110 to the work
lamp switch (C725) and the microrelay (G377)
for the accessories power supply to the radio.
STARTER CIRCUIT
If the ignition switch C539 is turned (contact 1
is connected to 4), contact relay G015 will be
activated via wire 4001.
When the ignition switch is turned to the
“start” position, points 1 and 2 in this switch
are connected. The power is now supplied
from the batteries through fuse E037, the
connection 1-2 of the ignition/starter switch
and wire 4004 on connection point 3 of the
alarm system.
When the alarm system has been switched off
using the remote control, or by turning on the
ignition (the immobiliser switches the alarm off
via CAN), wire 4004 is connected to 4004A.
Relay G203 coil will be activated.
This closes the 30 - 87 connection. A voltage
is now applied to connection point 50 of the
starter motor through fuse E037, wire 1100,
relay contacts 30 - 87 and wire 4002 so that
the starter motor starts running.
When the alarm has been switched off and
the door has opened, the start interrupter will
be deactivated for 60 seconds. If the engine is
not started within this time, the start
interrupter is reactivated. If the alarm is
switched off and the doors are not opened,
the start interrupter remains deactivated for 9
minutes.
When the immobiliser applies a voltage to
wire 4009, the cab heater is also switched off
if the vehicle must meet requirements for the
transportation of hazardous substances.
CHARGING CIRCUIT
When the ignition is switched on, power is
supplied to both the B+ connection and
connection 15 of the alternator.
An internal resistor in the alternator is
energised by an IC in the carbon brush holder.
This resistor ensures that a low level of
current passes through the energising
resistor. This excites a magnetic field in the
alternator.
After starting, the voltage on terminals B+ and
15 will rise to about 28.5 V. Once this voltage
is reached, the IC in the regulator interrupts
the pre-exciter coil to enable the voltage to be
controlled. The magnetic field will now
disappear, so that the generator will not be
energised for a short period of time. As a
result, the voltage on outputs B+ and B15 will
drop.
The regulator reactivates when the voltage
drops below 27.6 V. This means that the
generator voltage supply remains relatively
constant. The batteries are supplied through
the B+ generator output.
The alternator charging current warning light
is activated via wire 1020 that is connected to
the VIC. (D900). The VIC controls the DIP via
the CAN network. The voltage on wire 1020 is
supplied by the control IC.
The alternator also has a ’sens’ line. This
connection continuously measures the voltage
on connection point 30 of the starter motor. If
the voltage on connection point 30 drops, the
voltage is immediately corrected by the
control IC. The alternator will increase the
voltage until a value of 28.5 V is reached
again.
VARIANTS
Location
42 If there is no alarm system, wire
4004 and 4004A are connected in
connector 603.
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