Actually, the worse possibility is a BeCM problem. If you leave the turn signal stalk in the middle, you'll have no parking lights. And with parking lights, you'd have front and rear on not just front.
When you turn on the lights, blow the horn, or do anything else that has too do with electrics in our miracles of early 90's technology, you send a request to the BeCM (so be polite...). The logic portion of the BeCM decides if your request is in order - for instance with lights, that the ignition is on - and if all is OK sends a signal to the power portion of the BeCM where a transistor switches power to the lights, horn, etc. When these transistors start to fail, they do things such as permanently feeding power to a light, intermittently or never feeding power, etc.
There are several pages on the BeCM on the main site as well as threads on repairing the BeCM here. Check to make sure its nothing simple/obvious (shorted wire, etc) before diving in, tho... :?