Cluster Self-Test Mode; Bulb Test; Gauge Test; Buzzer Test - Volvo VNL Service Manual

Group 38 Instrumentation, VNL, VNM

Cluster self-test mode

As an aid in troubleshooting the cluster, the cluster self-
test mode provides the following tests:
Note: While in the cluster self-test mode, the Engine
ECU data link is disconnected. Therefore the gauges will
not function until the cluster is out of the self-test mode.
•
Bulb test - Turns on all telltale indicators, and red
warning LEDs in the gauges which have them, for
ten seconds.
Note: The gauges in the instrument cluster are not
functional during the bulb test. The ignition key can
be cycled off and on to interrupt any test.
•
Gauge test - This causes the pointers in the
Tachometer, Speedometer, Oil PSI, Coolant Tem-
perature, Fuel, and Turbo Boost gauges to sweep
from minimum scale to full scale and back, briefly
stopping at mid-scale each way. This occurs three
times. The pyrometer, axle temperature and air
pressure gauges are excluded from the self test.
Cycle the ignition key off and on after the gauge test
to return the gauges to normal function.
Note: Each time power is applied to the cluster, the
speedometer and tachometer pointers return to
zero, taking the shortest path (usually counter-
clockwise). If (during shipment, for example) the
pointers are at the high end of their scales, they will
move clockwise toward zero when power is applied,
and will be prevented from reaching zero by the
gauge housing. In this case, use the Gauge Test
function to return the tachometer and speedometer
pointers counter-clockwise to zero.
•
Display test - To help identify defects in the Graphic
Display, the display will alternate between all dark
and all light for about 10 seconds:
Fig. 20:
•
Buzzer test - Sounds each of the three buzzer sig-
nals for 10 seconds each.
1 To access the Cluster Self Test:
2 Use the Mode button to display DIAGNOSTICS
MENU.
3 Press the Up or Down button to scroll to
CLUSTER SELF TEST MODE.
4 Press the Set button to activate the Cluster Self
Test mode.
5 Press the Up or Down button to display the de-
sired test name (Bulb Test, Gauge Test, Display
Test, or Buzzer Test).
6 Press the Set button to begin the displayed test.
The test will end automatically.
Design and Function
W3000719
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