Qualcomm OBDII J1708 Průvodce řešením problémů stáhnout pdf (Strana 39)

80-JB566-1 Rev. C 11-1

MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION

Display Screen is Dark or Blank

Problem: Display Screen is Dark or Blank

If the display is blank or dark it could be:

• Unit is asleep (i.e. ignition off, and power down timer exceeded)

• Power source or Power/IO cable problem

• Ignition source or ignition wire problem

• Display cable is disconnected from VTM

• Faulty DIU

Turn the vehicle ignition ON.

1. Check to see if the LED on the VTM50 is blinking red as unit boots up.

• If it is not blinking, reseat the Power/IO connection at the VTM. If the LED is still not

blinking, use a digital volt meter to check for power and ignition at the truck’s

diagnostic connector. Pin-outs for the 6-pin and 9-pin connectors are in the Appendix

A: Wiring Diagrams and Charts

• Verify, using a digital volt meter, that the ignition circuit, fuse, and source are

functioning properly. 12 VDC should be detected when the truck’s ignition key is in

the ON position.

2. If there is still a problem, remove power from VTM, reseat the display cable connector

at the VTM, and then reapply power to the VTM.

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Qualcomm OBDII J1708 Průvodce řešením problémů Strana 39