GM Service Manual Online
For 1990-2009 cars only

To replace a CHMSL bulb, do the following:

  1. Open the trunk. See Trunk for more information.

  2. Object Number: 810627  Size: B3
  3. Reach through the access opening in the trunk lid.

  4. Object Number: 810631  Size: B3
  5. Remove the old bulb by turning it counterclockwise one-quarter turn.
  6. Push the new bulb into the bulb socket.
  7. Turn the socket clockwise one-quarter turn to reinstall.