JD 3320 flasher problem

[Mcswajl]

2013 JD 3320 HST 4 way flashers work correctly. Turn signals do not. Press left signal button and both left and right lights light up but do not flash, press the right signal button and both left and right lights flash. My 3320 has a single toggle switch left of the steering wheel. I checked fuses and looks fine, checked the ground wire inside both light housing and they are good. Open cab. I can稚 find a flasher control or a relay. Do these 3320s have a flasher or is it controlled in the computer? Any thoughts on what I should do? How can I reset the codes? Thanks