Scantool can't communicate with the car

Hi all,

I went to a local toyota today to have the brake fluid changed and their scantool couldn't communicate with the car.

Now, I wanted to ask a few questions.

1) Is there a separate communication ecu that handles the diagnostics port?
2) Is there a fuse that could have been broken?

To give a few more details, the car is a 2004 gen II prius. It has an lpg system installed. The lpg ecu reads the fuel trims through the diagnostics port all the time.

Thanks in advance

 

Never mind people. I just went to another mechanic, who connected to car immediately.

Thanks anyway!