Hi rlyons. According to alldata, "The Flasher function for this vehicle is controlled by the Lighting Control Module (LCM)". I'll let someone with knowledge in that area troubleshoot further.
In my opinion, Gabriel Ultra's are junk. Autozone talked me into a set and I regretted it for several thousand miles. It was like running a set of busted/wore out shocks. KYB shocks are the way to go for ride quality and value.