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
.
The methane pressure sensor
K54
,
located on the adjustment solenoid valve, receives a reference earth
and supply from the engine management control unit
M10
-
pins 30 and 33 - and sends a signal proportional to the pressure
of the methane to the control unit
M10
- pin 46 and to the
instrument
E50
pin 9 of connector A.
This signal, processed by the electronic
device inside the instrument, operates the level gauge and the reserve
warning light (pins 2 and 26 of connector A, normally used on petrol
versions are not connected here).
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.
Signals from handbrake switch
I40
and brake fluid level sensor
K25
. reach pin 11 of connector
A and pin 15 of connector C of
E50
, respectively. and light
up the insufficient 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
.