2003 Buick LeSabre V6-3.8L VIN K
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Parts Information OEM Part #Price
Door Switch & The
Door Jamb Switch is
Part Of Door Actuator.
this is the pin out for the parts involved can you have those checked ,
most likely the door jamb switch is stuck or bad, but in this model it is part of door lock actuator, which involves taking door panel off to get to it.
the courtesy light works manually so we know the bulb is good, but there is if u notice in the diagram that one pin is light control on the courtesy connector , this need to be checked also to confirm
Is this something You are trying to fix yourself or just have a idea what is going on .
just let me know , be glad to help you
Thank You ***** ( aka -Customer)
ASE Certified Tech