2011 with crazy activity - lights on by themselves, no codes

oddest thing - my 2011 Prius with 198,000 miles had the parking lights turn on by themselves yesterday at 5pm - dusk. The car was used earlier and parked. I only know this from security cameras. At about 6amt the hazards came on (still dark). The hazards will not turn off. As soon as I moved the car, the trac control, brake, tirepressure, came on. No check engine or hybrid warning. Drove car and it seemed to perform normally. I took to local garage and the Snap ON scanner only found a wheen speed sensor code. My daughter said car worked fine with no lights before she parked it yesterday. We cleared all codes and I disconnected the battery, but nothing has made a difference - dash still lit up and hazards flashing. It is damp from rain.
Any ideas are welcome!

 

i looked and did not see any evidence of rodents chewing. Not a problem I have had either. The car was sitting in a driveway and the parking lights just popped on. Then 12 hours later the hazards and they wont turn off. Coplay, PA is about 90 miles north of Philadelphia. small suburban town.

 

It is a rear spped sensor - I replaced them both about 2.5 years ago. The speed sensors on a gen 3 prius are inside the hub, so you cant remove them. It would be odd that the speed sensor never through a code while driving but came on when car sitting in driveway? At dusk the parking lights popped on and then 12 hours later the the hazards.

 

yea. It is very wet right now. I am going to check the wiring on the speed sensor, but would that cause the hazards to act up and not turn off? my gut is feeling like a skid control module short.

 

all four corners are flashing. started on thier own while vehicle was off. The parking lights came on by themselves first and then hazards about 12 hours later. It has been rainy and damp, so the corrusion idea seems reasonable. I assume first step to to remove wiper cowl and inspect the skid module connection?

 

my daugher that drives the car just mentioned that at times the wipers did not go on right away. a 5 second delay or so. This is concerning in that there could be a corrosion issue in other harnesses as well

 

some updates:
When i let the car sit yesterday afternoon for a few hours I was able to turn off the hazards (I just left them blinking). The car worked fine with no traction/skid/abs/brake lights. This lasted about a block and then hazards came back as well as all warning lights. I disconnected the negative last night and when I reconnected today I was able to turn off the hazards - they came back on in about a minute with the car not moving or starting.
When I removed the ECU plug on the acutator the hazards went out and then they functioned perfectly . I blew out the connections and used some electrical connection cleaner, but lights came back on when I reconnected. Although it is a Northeast car, the connections are not corroded or any spiders. Based on this, I believe it points to a short in the brake actuator?

 

the parking lights are an odd twist as they went on just as dusk hit. The lights were set to automatic, but I am pretty sure we never had this issue before or the battery would have died. I am going to experiment with that issue tonight as I will set the lights back to auto and see what happens. I am going to look around for any wire shorts while i have the wiper cowl off, but I am not optomistic.

 

maybe inconsequential, but I checked the connection of the speed sensor at the rear wheel - it does not click in tight. It is in place but does not fully connect. I have a feeling it may have been like this for awhile, and may explain the Scanner codes althoough I did not have any warning lights until the current situation. No matter what I do with the plug the hazards do not stop though. I would have expected them to shutoff when I pulled the plug off the sensor if the sensor was the problem.