GM Service Manual Online
For 1990-2009 cars only

To replace a sidemarker lamp bulb, do the following:

  1. Locate the rear sidemarker lamp assembly under the rear bumper.

  2. Object Number: 1401634  Size: A2

    Turn the socket counterclockwise and then pull it straight out from the sidemarker lamp assembly.

  3. Pull the old bulb straight out and reinstall the new bulb.
  4. Reverse Step 2 to reinstall the socket.