The domestic rear lamp unit (1) contains two bulbs. They are: backup (3) and park/stop/turn signal/rear side marker (2). The service procedures for each bulb are the same, only the bulb sizes and types may differ.Disconnect and isolate the battery negative cable.Remove the rear lamp unit (1) from the rear body sheet metal. (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/REAR LAMP UNIT - REMOVAL).Firmly grasp the appropriate bulb socket (2 or 3) on the back of the rear lamp unit housing and rotate it counterclockwise about 30 degrees to unlock it.Pull the socket and bulb straight out from the keyed opening in the housing.Pull the base of the bulb straight out of the socket.