2004 Audi Cabriolet Malfunctioning.

I have a 2004 Audi S4 Cabriolet. Last Sunday my car was parked in a parking lot over nite. We recieved alot of rain that nite. Water came up to my doors.
While I was driving my car I rolled down the driver side window. When I got to my destination, I was unable to roll the window back up. Cluster lights started going crazy, alarm went off. It was showing that my trunk was open when in fact it was closed.
Now. A couple of days has passed. I have been able to roll all my windows down. All lights work. Still showing that my trunk is open. I have tried closing and opening the trunk serveral times to get the light to go out. But no luck. I am unable to use my remote
to lock and unlock the car. My guess is that the Body control module got wet during the storm. Is there anyway tha I can take it out ad dry it off. Where is the body controle module located.

Thanks,
Mike S