5V Arduino pro mini is not working with HC-05 module..

Hi,
In my project I'm using arduino pro mini and HC-05 bluetooth module. Unfortunately, I'm facing some issues. Hc-05 module is not working (the led is not blinking). I measured the voltage between raw and ground pin and it's around 1.5V (while Hc-05 is attached). By the way, I'm feeding arduino with 9V. Without load voltage on raw pin is 5V. On arduino uno and nano everything works fine. What I'm doing wrong?

"I measured the voltage between raw and ground pin and it's around 1.5V (while Hc-05 is attached)"
"I'm feeding Arduino with 9V"

Are you trying to use a little "9V battery"? If so, it's inadequate to the task.
The HC's current demand may exceed the ProMini 5V's capacity.