GM Service Manual Online
For 1990-2009 cars only

To replace one of these bulbs, do the following:

       • 
    Object Number: 918828  Size: A3
  1. Taillamp
  2.    • 
  3. Back-Up Lamp
  4.    • 
  5. Taillamp/Stoplamp/Turn Signal Lamp
  1. Open the trunk. See Trunk for more information.

  2. Object Number: 988416  Size: A3
  3. Remove the two fasteners located on the inside of the trunk at the rear of the vehicle.
  4. Pull back the trunk trim.
  5. Remove the plastic wing nut.
  6. Pull out the taillamp assembly and turn the bulb socket one quarter turn counterclockwise.

  7. Object Number: 1818156  Size: A2

    Pull the bulb to remove it from the socket. Replace the old bulb with a new one.

  8. Reverse the steps to attach the taillamp assembly to the vehicle.
  9. When securing the lamp assembly back into place, align the assembly so that the trunk lid doesn't contact it.