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Home >> Chevrolet >> 2009 >> Uplander Base, 3.9 1 >> Repair and Diagnosis >> Electrical >> Charging Systems >> Engine Electrical >> Diagnostic Information and Procedures >> DTC B1420 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connectors at the appropriate module.
  2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the ground circuit and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminals and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminals and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, replace the appropriate module.
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