Entry Light Timer System
WARNING: This page is about a different car, the 1996 Honda Accord. However, it is still accessible from the selected car via links, so may be relevant.
Voltage is applied at all times to the ignition key light in the steering lock assembly through fuse 30 and to the integrated control unit through fuse 37. When you open the drivers door, the integrated control unit provides a ground for the ignition key light. The light then goes on and stays on for 10 seconds after the door is closed.