Why is door open dash light and dome light stay on when door is closed on 2006 Mazda 3?

The door open dash light and dome light remaining on when the door is closed on a 2006 Mazda 3 could be due to a faulty door switch, which is responsible for detecting whether the door is closed. If the switch is stuck or malfunctioning, it may not properly signal the system that the door is shut. Additionally, issues with the vehicle's wiring or a malfunctioning body control module could also cause this problem. Inspecting the door switches and wiring is a good starting point for troubleshooting.