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just so i understand completely, did you say the light on the left door does not come on when you open the door?
You have a faulty door latch assembly. It is electronic and is a common failure. But just to make sure there are no fuses out I am including a wiring diagram. click here. Check all the fuses to the comfort system and electronics. You may also have a bad battery in the remote. Reguardless the door light and interior light should come on with the door open.