I've been searching for this info since I bought my JKU, and moreso since I put in all LED bulbs.
It seems to me that the 'fast flash' for the turn signals may be software controlled, and if so I'd like to cancel that message out somehow as all my bulbs are just fine...
What leads me to believe this is if I hit the hazard button, the flash rate goes back to normal.
Additionally, I've had several occasions where while driving, it has gotten reset...
It takes 3 blinks of the turn signal before it activates, and when the reset occurs, the rate goes to normal for 3 cycles.
I don't suppose you have any info on this? I have not yet re-opened my dash to connect via the radio connection, but will be doing so at the latest this weekend.
Any insight would be most appreciated.