Group 30 Electrical System—VNL, VNM
Design and Function
Instrumentation
W3000787
The instrumentation is new. There are several variants
of instruments, depending on what options have been
installed on the vehicle, and on whether the speedometer
is mph or km/h. A new feature of the instrument cluster is
the graphic display.
The instruments are divided into three groups. The center
group is always the same, regardless of which options are
installed on the vehicle.
The center instrument group contains, in addition to a
number of indicator and warning lamps, the tachometer
and speedometer/odometer. Above these instruments are
4 buttons which control the graphic display.
On a truck with the standard instrument cluster, the left-
hand instrument section contains instruments for coolant
temp. and oil pressure, as well as the graphic display
and indicator lamps. Optional pyrometer and turbo gauges
may be installed. The Caution and Stop warning lamps are
on this side, and are used to warn of engine cautions and
engine shutdowns. The other lamps indicate low engine
fluid and low voltage.
The right-hand instrument section contains the fuel and
brake pressure gauges, and the remainder of the warning
lamps. Axle temp. and air pressure gauges may be
installed.
For more information on the instrumentation, see the
Instrumentation, VNL, VNM manual.
Graphic Display
The graphic display is in the lower left-hand side of the
instrument cluster. It is operated by the up, down, mode
and set buttons in the center section.
With the mode/set buttons, the driver can select the
function to be checked. There are both text and graphic
displays of many functions. If, for example, the driver
checks the voltage, and 12.5 volts is displayed, this is
a normal value. If the voltage rises, the display will relay
the information that this is an abnormally high value and
vice-versa.
The graphic display optionally contains a fuel economy
feature which provides information about fuel consump-
tion. Both the average and accumulated consumption can
be measured. This feature can show the number of miles
or kilometers driven and calculate the distance until the
fuel tank is empty. It can also show the average speed
of the journey to date and the required average speed to
cover a given distance in a given time.
Diagnostic Connector
The connector for electronic system diagnostics is a round
6-pin Deutsch connector located in the driver’s side kick
panel. It conforms to the industry standard SAE J1708 for
serial data communications.
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