Buick 2007 Rainier Owner's Manual page 406

4. Unclip the wiring harness (A) and remove the
three socket retaining screws (B).
5. Remove the socket plate.
6. Holding the socket, pull the old bulb to
release it from the socket.
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7. Push the new bulb into the socket until it clicks.
8. Reinstall the socket plate and tighten the
three screws.
9. Reconnect the wiring harness.
10. Reinstall the taillamp assembly by lining up
the locator pins with the retainers in the
vehicle's body.
11. Reinstall the two screws and tighten.