Any report from the cluster when you start or turn the key to run?
I may be thinking of later vehicles, but I thought the cluster info center notes which door, but I could be wrong.
Also, just to confirm, your issue is a door sensor is stuck reading "door open"? And you're think the back passenger is the culprit at this point?
You can confirm if driver door by locking the door with power lock switch in door and the engine running. Driver door ajar and power lock pressed should auto unlock to prevent lock out.
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