The supply controlled by the ignition (INT)
for the instrument
E50
reaches pin 19 of connector A from
the line protected by fuse
F1
of the junction unit
B1
.
The instrument
E50
is also supplied
directly by the battery - pin 17 of connector A - via the line for
the maxifuse J/B1 of
B5
protected by fuse
F10
of
the junction unit
B1
.
Pin 18 of connector A is earthed (electronic
earth).Pin 1 of connector B is earthed (power earth).
Pin 15 of connector A receives a reference
earth from the engine management control unit
M10
.
Pins 2 and 16 of connector A receive signals
coming from the petrol fuel gauge, located in the electric pump
unit
N40
: these signals, processed by the internal electronic
device, operate the fuel gauge and the reserve warning light.
The methane pressure sensor
K54, located
on the regulation solenoid valve, receives a supply and reference
earth from the methane control unit M19 - pins 16 and 6 of connector A
- and sends a signal proportional to the pressure of the methane
to the control unit M19 - pin 30 of connector A;
the latter
sends a signal proportional to the methane level - from pin 60 of
connector B - to instrument
E50 pin 9 ofl connector A.This signal, processed by the electronic
device inside the instrument, operates the (green) indication LEDs
and the (amber) reserve one.
Insufficient engine oil pressure is signalled
to pin 18 of connector C from the earth signal coming from the sensor
K30
.
The signal from the sensor
K20
reaches
pin 13 of connector C and lights up the brake pad wear warning light.
The signals for the handbrake switch
l40
and the brake fluid level sensor
K25
reach, respectively,
pins 11 of connector A and 15 of connector C of
E50
and
light up the low brake fluid level / handbrake warning light. The
same warning light is on - together with the ABS failure warning
light - if the ABS control unit detects problems involving the EBD
function
See E7020 ABS
.
Pin 5 of connector B of
E50
receives
the 'doors open' signal coming from the integrated services control
unit
M40
, pin 7 of connector A.
See E2510 COURTESY LIGHTS
The inertia switch
I50
intervention
signal reaches pin 3 of connector A of
E50
: under these
circumstances the instrument panel produces the appropriate signal.
The speedometer sensor
K84
located
on the gearbox is supplied from pin 20 of connector A of
E50
and
sends a signal to pin 5 of connector A: this signal, processed by
the internal electronic device, operates the vehicle speed indicator
and the milometer and the output is available: from pins 30, 31
and 32 of connector A for the engine management control unit, the
navigation system, the taxi-meter, etc.
The engine rpm signal reaches the engine
management control unit
M10
at pin 6 of connector A of
E50
:
this signal, processed by the internal electronic device, operates
the rev counter.
A 'fuel consumption' signal, used by the
trip computer, reaches pin 7 of connector A of
E50
from
the engine management control unit
M10
.