Time Delay

All A01 cars came with them and it is simply a thermal relay that starts heating up and closes it contact as soon as a door is opened and then slowly cools and allows the lamp at the ignition switch to turn on until it cools such that it opens back up turning the lamp off. The longer the door stays open the hotter it gets and longer it stays energized or closed. They were used right up to 2002 and are readily available.