Problem: Display Immediately goes Blank when Ignition is Turned Off
Display Screen is Dark or Blank
12-2
80-JB566-1 Rev. G
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
3.
If there is still a problem, remove power from the VTM, install a replacement DIU50
display, reapply power to the VTM, and recheck.
Problem: Display Immediately goes Blank when Ignition is Turned Off
When vehicle ignition is turned OFF, the display should stay on for the period of time that has
been configured by dispatch. This is the power down time. If the display screen immediately
blanks out when the ignition is turned OFF, this could be caused by:
•
The MCP50’s power-down time or total time is set to zero.
-
Check the host software configuration.
-
The power-down time should not be set below five minutes.
•
Make sure primary power is constant not switched.
Verify diagnostic connector power is ON with ignition On or Off. It cannot be a switched
circuit. Measure 12V constant power with ignition off. If it is not, find an alternate constant
power source.
See Appendix A,
Wiring Diagrams and Charts
, for wire diagrams and schematics of the
below.
For 6-pin diagnostic connectors:
(-) lead on Pin E
(+) lead on Pin C
For 9-pin diagnostic connectors:
(-) lead on Pin A
(+) lead on Pin B
For Volvo/Mack 2014 or newer diagnostic connectors:
(-) lead on Pin 4
(+) lead on Pin 16
