GM Service Manual Online
For 1990-2009 cars only

Faulty electrical connections or wiring may cause most intermittents. Inspect for the following conditions:

    • Poor mating of connector halves
    • Terminals not fully seated in the connector body (backed out)
    • Dirt or corrosion on the terminals
        Ensure that the terminals are clean and free of any foreign material that may impede proper terminal contact.
    • Damaged connector body - exposing the terminals to moisture and dirt
    • Improper terminal orientation with the component or mating connector
    • Improperly formed or damaged terminals
        Carefully inspect all connector terminals in problem circuits in order to ensure good contact tension. Use a corresponding mating terminal in order to inspect for proper tension.
    • Use the J 35616 Connector Test Adapter Kit whenever a diagnostic procedure requests inspecting or probing a terminal. Using the adapter will ensure that no damage to the terminal will occur, and will indicate whether contact tension is sufficient.
    • Poor terminal to wire connection
        This includes the following conditions:
       - Poor crimps
       - Poor solder joints
       - Crimping over wire insulation rather than the wire itself
       - Corrosion in the wire to terminal contact area
    • Wire insulation that is rubbed through
        This causes an intermittent short as the bare area touches other wiring or parts of the vehicle.
    • Wiring broken inside the insulation
        This condition may cause a continuity inspect to show a good circuit. If only 1 or 2 strands of a multi-strand type wire are intact, resistance may be too high.

In order to avoid any of the above conditions when making wiring or terminal repairs, always follow the instructions for wiring and terminal repair in Wiring Repair .