2003 Subaru Impreza Owner's Manual - Page 213

Interior equipment Interior light When leaving your vehicle, make sure the light goes out to avoid battery discharge. inserted in the ignition switch. The light also can be turned on by use of the keyless entry transmitter. See the "Keyless entry system" in chapter 2 for detailed information. OFF: The light stays off. J Dome light J Cargo area light (if equipped) The dome light switch has three positions: ON: The light stays on continuously. DOOR (middle position): The dome light comes on when any of the doors (or the rear gate on wagon) is opened. The light remains on for several seconds and gradually goes out after all doors (and the rear gate on the wagon) are closed or if the key is 6-2 DOOR:The light comes on only when the rear gate is opened. OFF: The light stays off.