2003 Subaru Impreza Owner's Manual - Page 221

Interior equipment lighter plug. Do not use non-genuine cigarette lighter plugs in the socket. Doing so may cause a short-circuit and overheating, resulting in a fire. D If the socket is ever used for a plug-in accessory such as a mobile phone, that may damage the portion of the socket's internal mechanism that causes a cigarette lighter plug to "pop out" after its lighter element is heated. Therefore, do not place a cigarette lighter plug in a socket that has been used, even once, to power a plug-in accessory. Doing so may cause the plug to stick and overheat, creating a potential fire hazard. D Do not place any foreign objects, especially metal ones such as coins or aluminum foil, into the socket. That could cause a short circuit. J Use with a cigarette lighter The cigarette lighter operates only when the ignition switch is in the "ON" and "ACC" positions. To use the cigarette lighter, push in the knob and wait a few moments. It will automatically spring up when ready for use. WARNING To avoid being burned, never grasp the lighter by the end with the heating element. Doing so could result in injury and could also damage the heating element. 6-10