Hitting noise coming from back seat area, when start the car. 23 prius

Before I go to dealer, I wanted to write here.

When you start the car, I hear this noise. First, it's like a buzzing sound, not from the brake actuator. But like some motor is engaging. (around 1 second)

Right after I hear "tık tık tık tık tık" sound, then it stops. It's like it's trying to do something but it can't.

That sound coming from back seat area.
When I turn on the car and run back to trunk and listen, I don't hear much. So it's not coming from trunk. It's somewhere in the back seat.

Usually it's coming when car sits longer time before I start.

Maybe from fuel pump? Or some doors for fan in the back seat? Not sure. Do you hear something like this?

I will go to dealer but I am sure they won't diagnose and won't care because it doesn't come every time and needs effort to hear.

 

I will try. Its low sound but I will try to record. I know its difficult to understand if you dont have the same noise. But that also means its not normal and something is wrong with my car