97 Buick Regal turn signal not working?

My buick's driver side turn signal isn't working. It's not the headlamp assembly itself because I plugged the driver side into the passenger side and it worked perfectly fine. In terms of trouble shooting where should I check first. I had heard that it could be the MFS or a daytime running module... show more My buick's driver side turn signal isn't working. It's not the headlamp assembly itself because I plugged the driver side into the passenger side and it worked perfectly fine. In terms of trouble shooting where should I check first. I had heard that it could be the MFS or a daytime running module however the turn signal bulb is illuminated it just doesn't blink. What should I check first rather than spending all the money on a MFS?
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