Chevrolet 2007 TrailBlazer Owner's Manua page 443

4. Unclip the wiring harness (A) and remove the
three retaining screws (B) from the socket
plate.
5. Remove the socket plate.
6. Holding the socket, pull the bulb to release it
from the socket.
7. Push the new bulb into the socket until it
clicks.
8. Reinstall the socket 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.
12. Close the liftgate.
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