Illuminated Entry Function
WARNING: This page is about a different car, the 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
When the body ECU detects the unlock state after the unlock operation has been made, it turns on the lights, such as the ignition key cylinder light and interior light for approximately 15 seconds. If all the doors are locked during this operation, lighting is cancelled and the lights immediately fade out.