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Home >> Hummer >> 2004 >> H2 4D Utility Pickup >> Repair and Diagnosis >> External Pages >> Different car >> Section 227 (Starters) >> Diagnostic System Check - Engine Electrical >> Scan Tool Does Not Power Up >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
  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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