Hi guys,
I installed DRL with DRL module right now.PSM failure message dissapeared after few minutes but the airbag warning light is still on.
Do I need to visit porsche diagnostic to erase this error now or is wrong something else?
Thank you...

 

Any time you disconnect the battery the sensing circuits get activated. Sometimes they don't recognize and/or restore the 'OK' signal to the DME. I too installed the DRL Module but didn't get anything abnormal (w/ the exception of a PSM failure that went away) after connecting the battery.

Either a trip to the dealer or try using the Durametric (if you have access to one) to clear fault codes.