GM Service Manual Online
For 1990-2009 cars only

Faulty electrical connections or wiring may be the cause of most intermittent problems. In the event of an intermittent failure, inspect the suspect circuits for the following conditions:

    • Poor mating of the 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 the proper terminal contact.
    • Connector body damage that exposes the terminals to moisture and dirt.
        Damage will affect the maintenance of the proper terminal orientation with the component or the mating connector.
    • Improperly formed or damaged terminals.
        Inspect all connector terminals in problem circuits carefully in order to ensure good contact tension. Refer to Connector Repairs in Wiring Systems.
    • Use the J 35616 Connector Test Adapter Kit whenever a diagnostic procedure requests inspecting or probing a terminal.
        The adapter performs the following functions:
       - Ensures that no damage to the terminal will occur.
       - Indicates whether the contact tension is sufficient.
       - If the contact tension seems incorrect, refer to to Connector Repairs in Wiring Systems.
    • Poor terminal-to-wire connection.
        Remove the terminal from the connector body in order to inspect this connection. Refer to Repairing Connector Terminals in Wiring Systems. The following conditions indicate a poor terminal-to-wire connection:
       - Poor crimps.
       - Poor solder joints.
       - Crimping over the wire insulation rather than the wire itself.
       - Corrosion in the wire.