Sierra 3500 Denali 2WD V8-6.0L (2011)
1. While depressing the lock, pull the two connector halves apart.
Note: The terminal position assurance (TPA) is fragile and may break if not done carefully.
2. Use a small flat-blade tool to very carefully push the TPA towards the face of the connector on both sides of the connector.
3. View of the male half of the connector with female terminals.