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Home >> Hummer >> 2003 >> H2 >> Repair and Diagnosis >> Electrical >> Starter >> Starters >> Diagnostic System Check - Engine Electrical >> Scan Tool Does Not Power Up >> Diagnostic Procedures
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Diagnostic Procedures

  1. Test the battery positive voltage circuit of the data link connector (DLC) for an open or a short to ground. Did you find and correct the condition? If yes, go to Body Control Module . If no, go to next step.
  2. Test the ground circuit from pin 4 of the DLC for an open or high resistance. Did you find and correct the condition? If yes, go to Body Control Module . If no, go to next step.
  3. Inspect for poor connections and terminal tension at the DLC. Did you find and correct the condition? If yes, go to Body Control Module . If no, go to next step.
  4. The scan tool may be malfunctioning. Refer to the scan tool user guide. Did you obtain a properly operating scan tool? If yes, go to Body Control Module .
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