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Home >> Jeep >> 1991 >> Cherokee Laredo, 2D Utility, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> DRB-II Problems & Error Messages >> No Response Message
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No Response Message

  1. Ensure ignition is OFF and disconnect DRB-II. Using an external ohmmeter, check resistance of Pink or Black/Red wire between SBEC-II pin No. 25 and engine diagnostic connector. See Figure . If resistance is 10 ohms or more, repair open in Pink or Black/Red wire.
  2. If resistance is less than 10 ohms, check resistance of Light Green or Black/Pink wire between SBEC-II pin No. 45 and engine diagnostic connector. If resistance is 10 ohms or more, repair open in Light Green/Orange or Black/Pink wire.
  3. If resistance is less than 10 ohms, turn ignition off and disconnect DRB-II, DRB-II cartridge, and adapter cable. Find a second vehicle identical in equipment to vehicle being tested.
  4. Connect DRB-II to substitute (second) vehicle and use DRB-II as you did on original vehicle. If message screen is still blank, adapter cable or DRB-II (including cartridge) is faulty. Substitute adapter cable with a known good cable to find faulty component.
  5. If message screen is NOT blank, DRB-II and cable adapter are functioning properly. Inspect diagnostic connector on original vehicle for proper wire placement, corrosion, damaged terminals, or pushed-out pins. Repair as necessary.
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