I have just had a similar problem. I parked the car in my garage overnight, when I went to get it out the next morning the battery was flat and it would not start, also you cannot move the car because the brakes lock on.
I called Toyota assist (AA) they arrived within 45 mins. excellent service. The mechanic boosted the battery and told me to let it run for half an hour, which I did. He said it is a common problem with this model, I have had no problems since.

Has anyone else had trouble with flat Battery in this model I purchased this new car on September 1st 2023  in January 2024 my Battery went completely dead  then again in  April the same thing happened 

Yaris cross 2023 model

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