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Blank Message Screen

  1. Turn ignition off. Disconnect DRB, adapter cable and cartridge. Connect DRB to a different vehicle with equipment identical to vehicle being tested.
  2. Access DRB main menu. If message screen is still blank, adapter cable or DRB is faulty. Substitute adapter cable with a known good cable to locate faulty component.
  3. If message screen is not blank, DRB is functioning properly. If message screen is still blank, inspect diagnostic connector for proper wire placement, corrosion, damaged terminals or pushed-out pins. Repair if necessary.
  4. If diagnostic connector is okay, use external voltmeter to check voltage on Red wire at CCD data link connector. CCD data link connector is located under driver's side of instrument cluster. See Figure.
  5. If voltmeter reading at Red wire is at least 9 volts, repair open in CCD data link connector Black/Light Green (ground) wire. If voltage is not at least 9 volts, repair open in Red wire to battery.
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