I have the exact same chip as you and know how to solve the issue.
First of all, please add this to your /etc/apt/sources.list
Code:
deb http://httpredir.debian.org/debian/ jessie main contrib non-free
Now execute this command
and finally execute this whole command
Code:
apt-get install linux-image-$(uname -r|sed 's,[^-]*-[^-]*-,,') linux-headers-$(uname -r|sed 's,[^-]*-[^-]*-,,') broadcom-sta-dkms
Once the final installation has complete, restart your laptop or pc and your network card should be picking up available WIFI