DRB Blank Screen

If DRB Screen is blank, disconnect DRB from data link connector. Inspect for loose wiring connections or damaged harness or connectors. Ensure continuity to ground exists at data link connector terminals No. 4 and No. 5. See Figure . Ensure at least 11 volts exists at data link connector terminal No. 16. If 11 volts does not exist, check for blown BATT A7 fuse located in instrument panel fuse block. See Figure . If no problem can be found, malfunction with DRB or DRB cable may be present.