Sometimes this is caused by the child lock being engaged and then the unlock actuating lever fails or pops out, the only way round it that I have found is to cut a hole in the inner door panel and open the door, unfortunatly this means a new door panel.
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Sometimes this is caused by the child lock being engaged and then the unlock actuating lever fails or pops out, the only way round it that I have found is to cut a hole in the inner door panel and open the door, unfortunatly this means a new door panel.