2013 prius check hybrid system error message on with a bunch of other check lights after i washed th

Hello guys.
I bought a 2013 prius a couple of weeks ago. It was working fine, Took it to a car wash, and asked them to wash the car ( but without washing the underhood area ) and also went for a steam wash interior cleaning .
After this when i tried to start the car, the car did start but with a grumpy sound and the check hybrid system error was displayed, along with 4-5 other check lights. Called in a guy who had a tab which read the errors, he cleared the codes and i went back home but as soon as i reached my home the same thing happened again . Anyways i left the car overnight and tried starting it in the morning but the car wouldnt start . So i left it under the sun and blow dried the interior and the Hv battery area , with the 12v battery terminals disconnected . I did all this for 2 days and when i connected the terminals the third day the errors and check lights were gone and the car drove perfectly well .
Today after about 25 days , when i went for another car wash , the same thing has happened again . Did not wash the engine area ( under the hood ) did not pressure wash the tyres / behind the tyres area, just went for a body wash .
Can anybody tell me why after a car was this happens

 

Sorry forgot to mention, when i turn on the ignition the car does start but the hybrid systems seems to be disconnected, dosnt go on EV , only the engine works that too on a very high Rpm, and the back battern fan is running like crazy ( high speed ) Here is the picture of the dash when the car is on .