power door locks interior lighting short somewhere

What is your question?

2000 dodge caravan sport. power door lock drivers side sliding door clicks when driving. interior lights also flash. when i engage the power door locks from drivers door, all locks will lock except for drivers door. i manually locked the drivers side door and it all seemed to stop but then turned on heater and it all started up again. a short in the electrical system somewhere? where do i start to look?