Turning left flasher causes warning about driver door open

What is your question?

When left flasher or hazards are on computer warns me driver door is open and driver door lock becomes unusable. If I lock it manually the alarm goes off but if I signal a left turn the alarm comes on again. The alarm will go on and off as driving. I removed turn signal arm cleaned out contacts. Because of door lock issue I'm not positive that by replacing turn signal arm will solve issue? Any ideals guys?