Snookfins

I am new to posting to the forum and looking for recommendations on trouble shooting the Brake System Warning Light constantly on and rapid turn signals on my 2010 F150 Lariat. I replaced the heater blend door motor and after re-installing the dash, the brake warning light is constantly on and the turn signals flash rapidly. I think I may have screwed something up when I removed the dash. About half way through re-connecting the wiring harnesses, I realized I neglected to disconnect the battery (yes, I know – pretty dumb to miss such a basic step). I have a few questions I hope someone can help with.
1. Is there a step that I have missed to re-set systems once everything was re-connected?
2. Are these issues related?
3. Is there a re-set process for the brake system? I have checked the brake system itself, the fluid, connections, and the contact switches on the brake pedal and emergency brake. I have also checked all the bulbs in the turn signals to verify I don’t have a bad bulb causing the rapid turn signals.
4. Trouble shooting steps/recommendations?
I was so happy saving myself a ton of labor dollars to replace a $45 blend motor that I don’t want to concede defeat and take it in to the dealer if there are simple steps I can take to resolve the issue myself. Any insight would be greatly appreciated. I have always been able to find solutions to other maintenance issues on the forum, but have not found this issue in existing threads. Thanks

techrep

iTrader: (1)

did you check your third brake light...

Snookfins

Yes, all brake lights are working.

techrep

iTrader: (1)

did you just install LED bulbs ??

Snookfins

No. Everything was working prior to replacing the heater blend door motor. No other changes or modifications.

techrep

iTrader: (1)

do the actual bulbs flash rapidly or just the cluster lights

Snookfins

The rear left and right turn lights flash rapidly. Nothing else. The lights in the side mirrors and the front turn indicator lights do not illuminate.

techrep

iTrader: (1)

that's why the rapid flash...truck thinks the bulbs are burnt out..gotta be a harness that you un-plugged

Snookfins

yes, that is what I thought. Not 100% certain which one is for the brake system and turn lights, so I have checked every harness under the dash - unplugged and re-plugged to make sure they are all connected properly. All appear ok.

techrep

iTrader: (1)

check fuses and relays...