Sierra 1500 2WD V8-5.3L (2008)
5. The terminal positive assurance (TPA) is located in the front and rear of the connector.
6. Use a small flat-blade tool to remove the rear TPA from the connector.
Important: The front TPA cannot be removed from the connector. Only move it to the release point.
7. Use a small flat-blade tool to move the front TPA to the release position.